Welcome, guest | Sign In | My Account | Store | Cart

DB_eSession is a feature packed PHP class that stores session data in a MySQL database rather than flat files. It is powerful, designed with security in mind, and yet easy to utilize. The web site has a full package download containing example scripts too.

PHP, 3982 lines
   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
<?PHP //Make sure there are no whitespaces before '<' on this line.
/* vim: set expandtab tabstop=4 shiftwidth=4: */
// +----------------------------------------------------------------------+
// | DB_eSession is a feature packed PHP class that stores session data   |
// | in a MySQL database rather than files. It is powerful, designed with |
// | security in mind, and yet easy to utilize. The code contains lots of |
// | comments, it comes with full documentation, and examples of how to   |
// | use the class including a basic authentication login/logout process. |
// | It includes member functions useful (to webmasters) for monitoring or|
// | viewing, deleting, and altering sessions validity like in the case of|
// | locking one or more sessions upon detection of unauthorized use.     |
// | This custom MySQL database session handler class might just be what  |
// | you're looking to implement on your web or intranet site. Enjoy it!  |
// |                                                                      |
// | This script has been created and released under the GNU GPL and is   |
// | free to use and redistribute only if this whole header comments and  |
// | copyright statement are not removed. Author gives no warranties. Use |
// | at your own risk. Read the copyright, disclaimer, and license.       |
// |                                                                      |
// | System Requirements: Any OS supporting a web server for PHP to run.  |
// | Requires PHP version 4.2.0 or higher, MySQL version 3.22.5 or later. |
// | libmcrypt ver 2.2.x or higher is optional for encryption/decryption. |
// | session.auto_start PHP setting needs to be off. Register_globals can |
// | be on or off.                                                        |
// |                                                                      |
// | Tested under PHP ver 4.3.2/4/5, MySQL version 4.0.15/18, mcrypt 2.4.x|
// |                                                                      |
// +----------------------------------------------------------------------+
// | DB_eSession, Copyright (c) 2004 Lawrence Osiris, All Rights Reserved |
// +----------------------------------------------------------------------+
// | This program is free software; you can redistribute it and/or modify |
// | it under the terms of the GNU General Public License as published by |
// | the Free Software Foundation; either version 2 of the License, or    |
// | (at your option) any later version.                                  |
// |                                                                      |
// | This program is distributed in the hope that it will be useful,      |
// | but WITHOUT ANY WARRANTY; without even the implied warranty of       |
// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        |
// | GNU General Public License for more details.                         |
// |                                                                      |
// | You should have received a copy of the GNU General Public License    |
// | along with this program; if not, write to the                        |
// |                                                                      |
// | Free Software Foundation, Inc.,                                      |
// | 59 Temple Place, Suite 330,                                          |
// | Boston, MA  02111-1307  USA                                          |
// |                                                                      |
// | Or you may obtain the license at http://www.gnu.org/copyleft/gpl.html|
// |                                                                      |
// +----------------------------------------------------------------------+
// | Author: Lawrence Osiris <code@dearneighbor.com>                      |
// | At web: http://www.code.dearneighbor.com                             |
// |                                                                      |
// | Silas Palmer from Australia, wrote the code in sessEncode and        |
// | sessDecode member functions. Code used with permission and under GNU |
// | GPL too. Web address: http://www.silaspalmer.com                     |
// |                                                                      |
// +----------------------------------------------------------------------+
// |                                                                      |
// |                      C H A N G E   L O G                             |
// |                      -------------------                             |
// |                                                                      |
// | DATE        VERSION  DESCRIPTION                                     |
// | ----------  -------  ----------------------------------------------- |
// | 05/05/2004   1.0.0   Initial code distribution to the general public |
// | 06/03/2004   1.0.1   sessDecode: removed substr() and added trim().  |
// | 08/08/2004   1.0.2   sessDecode: Initialized $_decoded variable.     |
// |                      _getSecID: Commented out HTTP_ACCEPT_ENCODING.  |
// +----------------------------------------------------------------------+


/**
 * DB_ESESSION_LOADED - For checking whether the class has been defined. You can
 * use DB_ESESSION_LOADED or class_exists().
 *
 * @access public
 * @global bool To indicate this class has been loaded (with an include or require)
 */
define('DB_ESESSION_LOADED', TRUE);


/**
 * @package    DB_eSession
 * @license    http://opensource.org/licenses/gpl-license.php GNU Public License
 * @author     Lawrence Osiris <code@dearneighbor.com>
 * @link       http://www.code.dearneighbor.com
 * @copyright  Copyright &copy; 2004, Lawrence Osiris
 * @version    $Version: 1.0.0$
 * @access     public
 */
class DB_eSession
{

    /**
     * @var    string $_ver This scripts version number
     * @access private
     */
    var $_ver = '1.0.0';


    /**
     * @var    string $_REQ_VER The minimum PHP version number this script
     *                          requires in order to execute successfully.
     * @access private
     */
    var $_REQ_VER = '4.2.0';


    /**
     * @var    string $_mysql_ver The current MySQL version number
     * @access private
     */
    var $_mysql_ver = NULL;


    /**
     * @var    int $_dbh The resource link to the session database
     * @access private
     */
    var $_dbh;


    /**
     * @var    array $_db Holds session database access and table info.
     * @access private
     */
    var $_db = array();


    /**
     * @var    array $_sess_opt Holds the session configuration option values
     * @access private
     */
    var $_sess_opt = array();


    /**
     * @var    string $_sess_name Holds the current session name.
     * @access private
     */
    var $_sess_name = NULL;


    /**
     * @var    int $_sess_ID_len Holds the character length of session ID.
     * @access private
     */
    var $_sess_ID_len;


    /**
     * @var    string $_DEFAULT_LANG What the default language code is
     * @access private
     */
    var $_DEFAULT_LANG;


    /**
     * @var    string $_CURRENT_LANG What the current language code in use is
     * @access private
     */
    var $_CURRENT_LANG;


    /**
     * @var    bool   $_stop_on_warn Whether to stop script on encountering a
     *                warning message. Set $_param['stop_on_warn'].
     * @access private
     */
    var $_stop_on_warn;


    /**
     * @var    string $_WRN_COLOR Contains font color for warning messages.
     * @access private
     */
    var $_WRN_COLOR;


    /**
     * @var    string $_WRN_SIZE Contains font size for warning messages.
     * @access private
     */
    var $_WRN_SIZE;


    /**
     * @var    array $_WRN_MSGS Contains warning message constants for ea. lang.
     * @access private
     */
    var $_WRN_MSGS;


    /**
     * @var    string $_warnings Contains any non-fatal warning messages
     * @access private
     */
    var $_warnings = NULL;


    /**
     * @var    bool   $_stop_on_error Whether to stop script on encountering an
     *                error message or not. Set $_param['stop_on_error'].
     * @access private
     */
    var $_stop_on_error;


    /**
     * @var    string $_ERR_COLOR Contains font color for error messages.
     * @access private
     */
    var $_ERR_COLOR;


    /**
     * @var    string $_ERR_SIZE Contains font size for error messages.
     * @access private
     */
    var $_ERR_SIZE;


    /**
     * @var    array $_ERR_MSGS Contains error message constants for ea. lang.
     * @access private
     */
    var $_ERR_MSGS;


    /**
     * @var    string $_errors Contains error messages encountered
     * @access private
     */
    var $_errors = NULL;


    /**
     * @var    bool $_DETAIL_ERR_MSGS Display detail errors/warnings or not.
     * @access private
     */
    var $_DETAIL_ERR_MSGS;


    /**
     * @var    int $_MIN_SESS_ID_LEN Holds the minimum session ID length (12)
     * @access private
     */
    var $_MIN_SESS_ID_LEN = 12;


    /**
     * @var    int $_MAX_SESS_ID_LEN Holds the maximum session ID length of 32
     * @access private
     */
    var $_MAX_SESS_ID_LEN = 32;


    /**
     * @var    int $_SESS_LIFE Holds the session life duration in seconds
     * @access private
     */
    var $_SESS_LIFE;


    /**
     * @var    int $_SESS_TIMEOUT Holds the absolute session life in seconds
     * @access private
     */
    var $_SESS_TIMEOUT;


    /**
     * @var    int $_SEC_LEVEL Holds a number designating session security level
     * @access private
     */
    var $_SEC_LEVEL;

    /**
     * @var    bool $_ENCRYPT A flag to turn on session encryption TRUE/FALSE
     * @access private
     */
    var $_ENCRYPT;


    /**
     * @var    bool $_ENCRYPT_KEY A value used in session encryption/decryption
     * @access private
     */
    var $_ENCRYPT_KEY;

    /**
     * @var    bool $_ENC_KEY_HASHED An md5 value of $_ENCRYPT_KEY for security.
     * @access private
     */
    var $_ENC_KEY_HASHED;


    /**
     * @var    bool $_MCRYPT A flag to indicate if mcrypt library installed
     * @access private
     */
    var $_MCRYPT;


    /**
     * @var    bool $_MCRYPT_LATEST A flag to indicate if it's a newer library
     * @access private
     */
    var $_MCRYPT_LATEST;


    /**
     * @var    string $_KEY_PREFIX A secret key used in prefixing MD5 hashes
     * @access private
     */
    var $_KEY_PREFIX;


    /**
     * @var    string $_KEY_SUFFIX A secret key used in suffixing MD5 hashes
     * @access private
     */
    var $_KEY_SUFFIX;


    /**
     * @var    string $_CONF_PSWD A confirmation password for delete and lock
     * @access private
     */
    var $_CONF_PSWD;


    /**
     * @var    bool $_MAGIC_QUOTES_GPC Determines if GET/POST/COOKIE data are
     *              slashed
     * @access private
     */
    var $_MAGIC_QUOTES_GPC;


    /**
     * @var    bool $_MAGIC_QUOTES_RUNTIME Determines if external source data is
     *              slashed after reads (like from a DB)
     * @access private
     */
    var $_MAGIC_QUOTES_RUNTIME;


    /**
     * @var    bool $_ARG_SEP Output argument separator. Usually '&'.
     * @access private
     */
    var $_ARG_SEP;


    /**
     * @var    bool $_SLASH_ANYWAY Forces addslashes to occur to session data
     * @access private
     */
    var $_SLASH_ANYWAY;


    /**
     * @var    bool $_STRIP_ANYWAY Forces stripslashes to occur to session data
     * @access private
     */
    var $_STRIP_ANYWAY;


    /**
     * @var    bool $_GC_DEL_LOCKED Garbage Collection delete locked session T/F
     * @access private
     */
    var $_GC_DEL_LOCKED;


    /**
     * DB_eSession - Constructor
     * You could change to always pass by reference like this: (&$_param)
     * Or you could leave as is, and pass by reference to save on memory, like
     * this: $sess = new DB_eSession(&$sess_param);
     *
     * @param  array $_param Various database and session setting options
     * @return obj   New instance of DB_eSession class
     * @access private
     */
    function DB_eSession($_param = array())
    {
        define('STOP', TRUE);

        /**
         * Check minimum PHP version number for script to work, and
         * produce error if it doesn't meet that requirement.
         * version_compare() requires PHP v4.1.0 to work but shouldn't
         * use here because current PHP might be less than that.
         */
        if (strcmp($this->_REQ_VER, PHP_VERSION) > 0) {

            $this->_errors = PHP_VERSION . ' < ' . $this->_REQ_VER . "\n";
            /**
             * Display error and stop execution regardless of _stop_on_error
             * setting.
             */
            $this->_handleErrors(STOP);     // Severe error - exit script

        }


        if (is_array($_param)) {
            $_not_array = NULL;

        } else {
            $_not_array = 'NOT_ARRAY';      // For producing a warning
            $_param = array();
        }


        /**
         * Set the default and current language codes for displaying error and
         * warning messages. Default is 'en' for English.
         */
        $this->_DEFAULT_LANG = isSet($_param['default_lang']) ?
                                     $_param['default_lang']  : 'en';


        $this->_CURRENT_LANG = isSet($_param['current_lang']) ?
                                     $_param['current_lang']  :
                                     isSet($_SERVER['HTTP_ACCEPT_LANGUAGE']) ?
                        substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2) : 'en';


        /**
         * Set $_param['stop_on_error'] => FALSE to not have this class
         * stop execution upon an error. This means you will handle the
         * error checking and displays in your script. Default is to stop
         * (TRUE). This is used as the initial setting. This can be turned
         * on and off at any time by using stopOnErrors() or endStopOnErrors().
         */
        $this->_stop_on_error = (bool) isSet($_param['stop_on_error']) ?
                                             $_param['stop_on_error']  : TRUE;

        /**
         * Set the font color for error messages (any valid HTML syntax)
         */
        $this->_ERR_COLOR = isSet($_param['error_color']) ?
                                  $_param['error_color']  : 'RED';

        /**
         * Set the font size for error messages (any valid HTML syntax)
         */
        $this->_ERR_SIZE  = isSet($_param['error_size'])  ?
                                  $_param['error_size']   : '+0';

        /**
         * Set $_param['stop_on_warn'] => TRUE to have this class
         * stop execution upon a warning. Default is not to stop (FALSE). This
         * is used as the initial setting. This can be turned on and off at any
         * time by using stopOnWarnings() or endStopOnWarnings().
         */
        $this->_stop_on_warn = (bool) isSet($_param['stop_on_warn']) ?
                                            $_param['stop_on_warn']  : FALSE;

        /**
         * Set the font color for warning messages (any valid HTML syntax)
         */
        $this->_WRN_COLOR = isSet($_param['warn_color']) ?
                                  $_param['warn_color']  : 'BLUE';

        /**
         * Set the font size for warning messages (any valid HTML syntax)
         */
        $this->_WRN_SIZE  = isSet($_param['warn_size'])  ?
                                  $_param['warn_size']   : '+0';

        /**
         * Set to TRUE to display SQL syntax and other values when displaying
         * errors or warning messages encountered. Default is FALSE for security
         * purposes. Turn on mostly when in development or testing your site,
         * but remember to turn it off for a production ready site.
         */
        $this->_DETAIL_ERR_MSGS = (bool) isSet($_param['detail_err_msgs']) ?
                                               $_param['detail_err_msgs']  :
                                               FALSE;


        /**
         * Set $_param['buffer'] => TRUE to have this class
         * execute the ob_start() command to start buffering the output.
         * You may want to use if you can't resolve the 'headers already sent'
         * warning message generated by PHP/this script. The ob_end_flush()
         * is called implicitly at the end of your script. It flushes out the
         * contents of the buffer to the browser, and destroys the current
         * output buffer.
         */
        $_buffer = (bool) isSet($_param['buffer']) ? $_param['buffer'] : FALSE;
        if ($_buffer)
            ob_start();


        /**
         * Set the path and filename of the file containing the errors array
         * constants. You can use relative (recommended) or absolute file paths.
         * For security, specify a filename without the '.php' because the
         * class will automatically add '.php' to the end. i.e. If you specify
         * 'errors.php' this class will try to locate a file called
         * 'errors.php.php'. So, just specify 'errors'. The default path is
         * the current directory (where your script is running from), but
         * but recommend to put the errors file off the web directory along
         * with this class.DB_eSession.php file.
         */
        $_errors_path = isSet($_param['errors_path']) ?
                              $_param['errors_path']  : './';


        $_errors_file = isSet($_param['errors_file']) ?
                              $_param['errors_file']  : 'errors.DB_eSession';

        $_filename = $_errors_path . $_errors_file . '.php';

        if (($this->pregMatches('/^[a-z0-9_.]+$/i', $_errors_file)) &&
            (file_exists($_filename))) {

            $_loaded = require_once($_filename);

        } else {

            $this->_errors = "xxxx --> " . $_filename . " <-- xxxx\n";
            $this->_handleErrors(STOP);     // Severe error - exit script
        }

        if ((0 === strcmp($_loaded, 'LOAD_OK')) &&
            (isSet($_ERR))  &&
            (isSet($_WRN))) {

            $this->_ERR_MSGS = $_ERR;
            $this->_WRN_MSGS = $_WRN;
            unset($_ERR, $_WRN);

        } else {

            $this->_errors = '$_ERR $_WRN xxxx --> ' . $_filename .
                              " <-- xxxx\n";
            $this->_handleErrors(STOP);     // Severe error - exit script
        }


        if (!empty($_not_array))
            // Warning: parameter passed to class is not an array
            $this->_setWrnMsg($_not_array);


        /**
         * Whether or not to encrypt/decrypt the WHOLE session data. This will
         * trigger the use of the mcrypt library or sessEncode/sessDecode.
         * This can be set on or off on the fly and it will work accordingly.
         * The default is off since encryption takes extra resources/time.
        */
        $this->_ENCRYPT = (bool) isSet($_param['encrypt']) ?
                                       $_param['encrypt']  : FALSE;

        /**
         * The key used to encrypt/decrypt individual field data or the whole
         * session data. Keep this key a secret (keep off the web directory).
         * Use readable characters and make at least 62 UNIQUE characters long.
         */
        $this->_ENCRYPT_KEY = isSet($_param['encrypt_key']) ?
                                    $_param['encrypt_key']  :
            "z1Mc6KRxAfNwZ0dGjY5qBXhtrPgJO7eCaUmHvQT3yW8nDsI2VkEpiS4blFoLu9";

        /**
         * Determine if libmcrypt is installed and if it's one of the
         * latest versions.
         */
        $this->_MCRYPT        = extension_loaded('mcrypt');
        $this->_MCRYPT_LATEST = FALSE;
        if ($this->_MCRYPT) {

            if (defined('MCRYPT_TRIPLEDES'))      // Only defined in >= 2.4.x
                $this->_MCRYPT_LATEST = TRUE;

            /**
             * The key field used to encrypt/decrypt using the mcrypt library.
             */
            $this->_ENC_KEY_HASHED = md5($this->_ENCRYPT_KEY);

            $this->_ENC_ALGO = isSet($_param['encrypt_cipher']) ?
                                     $_param['encrypt_cipher']  : MCRYPT_GOST;

            $_algo = mcrypt_list_algorithms();
            if (!in_array($this->_ENC_ALGO, $_algo)) {

                // Could not assign the encryption algorithm...
                $this->_setErrMsg('BAD_ALGO', NULL, $this->_ENC_ALGO);
                $this->_handleErrors();
                $this->_ENC_ALGO = NULL;
            }

            $this->_ENC_MODE = isSet($_param['encrypt_mode']) ?
                                     $_param['encrypt_mode']  : MCRYPT_MODE_CFB;

            $_modes = mcrypt_list_modes();
            if (!in_array($this->_ENC_MODE, $_modes)) {

                // Could not assign the encryption mode...
                $this->_setErrMsg('BAD_ENC_MODE', NULL, $this->_ENC_MODE);
                $this->_handleErrors();
                $this->_ENC_MODE = NULL;

            } else
            if (($this->_ENC_MODE != MCRYPT_MODE_ECB) &&
                ($this->_ENC_MODE != MCRYPT_MODE_CBC) &&
                ($this->_ENC_MODE != MCRYPT_MODE_CFB) &&
                ($this->_ENC_MODE != MCRYPT_MODE_OFB)) {

                // Could not assign the encryption mode...Use class supported
                $this->_setErrMsg('BAD_MODE_SUPP', NULL, $this->_ENC_MODE,
                                  'ECB, CBC, CFB, OFB.');
                $this->_handleErrors();
                $this->_ENC_MODE = NULL;
            }

        } else {

            $this->_ENC_KEY_HASHED = NULL;
            $this->_ENC_ALGO       = NULL;
            $this->_ENC_MODE       = NULL;
        }


        /**
         * As of PHP 4.2.0, there is no need to seed the random number
         * generator, however, we'll do it here for portability. This will be
         * needed for use with the encryption/decryption mcrypt routines and
         * generating of a new session ID.
         */
        mt_srand((double)microtime()*1000000);
        srand((double)microtime()*1000000);


        /**
         * See if MD5 hashing keys have been passed, otherwise set defaults.
         */
        $this->_KEY_PREFIX = isSet($_param['key_prefix']) ?
            $_param['key_prefix'] : 'O9R^3mp#i|34';

        $this->_KEY_SUFFIX = isSet($_param['key_suffix']) ?
            $_param['key_suffix'] : '+t97!u0K-2L5';

        /**
         * A password used to pass to the delete all session/lock functions as a
         * way to confirm the intent of modifying all rows in the sessions
         * table.
         */
        $this->_CONF_PSWD   = isSet($_param['confirm_pswd']) ?
            $_param['confirm_pswd'] : '!*CONFIRMED*!';


        /**
         * Database related variables with assigned default values when not set.
         * Assign these necessary fields to allow connection to the database.
         * Remember to give 'sess_user' access privileges to 'db_esessions'.
         * Make sure the password is correct (sess1234 is the default).
         */
        $this->_db['db_host']       =
            isSet($_param['db_host']) ? $_param['db_host'] : 'localhost';

        $this->_db['db_user']       =
            isSet($_param['db_user']) ? $_param['db_user'] : 'sess_user';

        $this->_db['db_pswd']       =
            isSet($_param['db_pswd']) ? $_param['db_pswd'] : 'sess1234';

        $this->_db['db_name']       =
            isSet($_param['db_name']) ? $_param['db_name'] : 'db_esessions';

        $this->_db['db_persistent'] =
            isSet($_param['db_persistent']) ?
                (bool) $_param['db_persistent'] : FALSE;

        $this->_db['db_resource']   =
            isSet($_param['db_resource']) ? $_param['db_resource'] : NULL;

        /**
         * Optionally supply a database resource link. This class will NOT
         * attempt to connect to MySQL and use the link instead.
         */
        if (is_resource($this->_db['db_resource']))
            $this->_dbh = $this->_db['db_resource'];
        else
            $this->_dbh = NULL;


        /**
         * Table related variables with assigned default values when not set.
         * Assign these necessary fields to allow connection to the 'sessions'
         * table. Specify what each column name is defined as in the table.
         */
        $this->_db['tb_name']       =
            isSet($_param['tb_name'])    ? $_param['tb_name']   : 'eSessions';

        $this->_db['tb_id_col']     =
            isSet($_param['tb_id_col'])  ? $_param['tb_id_col'] : 'sess_id';

        $this->_db['tb_sl_col']     =
            isSet($_param['tb_sl_col'])  ? $_param['tb_sl_col'] :
                'sess_sec_level';

        $this->_db['tb_cr_col']     =
            isSet($_param['tb_cr_col'])  ? $_param['tb_cr_col'] :
                'sess_created';

        $this->_db['tb_ex_col']     =
            isSet($_param['tb_ex_col'])  ? $_param['tb_ex_col'] : 'sess_expiry';

        $this->_db['tb_to_col']     =
            isSet($_param['tb_to_col'])  ? $_param['tb_to_col'] :
                'sess_timeout';

        $this->_db['tb_lk_col']     =
            isSet($_param['tb_lk_col'])  ? $_param['tb_lk_col'] : 'sess_locked';

        $this->_db['tb_vl_col']     =
            isSet($_param['tb_vl_col'])  ? $_param['tb_vl_col'] : 'sess_value';

        $this->_db['tb_iv_col']     =
            isSet($_param['tb_iv_col'])  ? $_param['tb_iv_col'] : 'sess_enc_iv';

        $this->_db['tb_si_col']     =
            isSet($_param['tb_si_col'])  ? $_param['tb_si_col'] : 'sess_sec_id';

        $this->_db['tb_tr_col']     =
            isSet($_param['tb_tr_col'])  ? $_param['tb_tr_col'] : 'sess_trace';


        /**
         * Set $_param['sess_id_len'] to be the length of the session ID.
         * Default of $this->_MAX_SESS_ID_LEN will be used.
         */
        $this->_sess_ID_len         = (int)
            isSet($_param['sess_id_len']) ? intval($_param['sess_id_len']) :
                                            $this->_MAX_SESS_ID_LEN;

        if ($this->_sess_ID_len < $this->_MIN_SESS_ID_LEN)
            $this->_sess_ID_len = $this->_MIN_SESS_ID_LEN;
        else
            if ($this->_sess_ID_len > $this->_MAX_SESS_ID_LEN)
                $this->_sess_ID_len = $this->_MAX_SESS_ID_LEN;

        /**
         * Set $_param['new_sid'] => TRUE to create a new session ID.
         * Default is FALSE. Takes effect before a session_start().
         * This can be set TRUE without setting $_param['sess_id'], in
         * which case, a session ID will be automatically generated.
         */
        $_new_sess_ID               = (bool)
            isSet($_param['new_sid']) ? $_param['new_sid'] : FALSE;

        /**
         * If desired, set $_param['sess_id'] to a valid custom session ID.
         * Works in conjunction with $_param['new_sid'] (must be set to TRUE).
         */
        $_sess_ID                   =
            isSet($_param['sess_id']) ? $_param['sess_id'] : NULL;

        if (!empty($_sess_ID)) {
            if (strlen($_sess_ID) != $this->_sess_ID_len) {

                // Warning: Custom session ID passed is not the right length
                $this->_setWrnMsg('SESS_LENGTH', NULL, $this->_sess_ID_len,
                                  $_param['sess_id']);

                $_sess_ID = NULL;

            } else
                if (!$this->pregMatches('/^[a-zA-Z0-9]+/', $_sess_ID)) {

                    // Warning: Custom session ID passed is invalid.
                    $this->_setWrnMsg('SESS_INVALID', NULL, $_param['sess_id']);

                    $_sess_ID = NULL;
                }
        }


        /**
         * Set $_param['ie_fix'] => TRUE (default) to send a header output to
         * fix the IE bug. See further comments below.
         */
        $_IE_fix                    = (bool)
            isSet($_param['ie_fix'])  ? $_param['ie_fix']  : TRUE;


        /**
         * When set to TRUE, locked session rows will be deleted right
         * away, regardless of their current expiry or timeout settings when
         * the Garbage Collection cleanup/delete function is invoked.
         */
        $this->_GC_DEL_LOCKED = (bool)
            isSet($_param['gc_del_locked']) ? $_param['gc_del_locked'] : FALSE;


        /**
         * Session Runtime Configurations. See:
         * http://us2.php.net/manual/en/ref.session.php
         *
         * Not all can be set or take effect outside of the php.ini
         * configuration file. Some options can be set at runtime without
         * an error produced, but have no effect. i.e. session.auto_start
         *
         * All session options are used here in case there is future support
         * to make option take effect at runtime. i.e. session.use_trans_sid
         *
         * When $_param['stop_on_warn'] is FALSE, check for warning messages
         * using warningsExist().
         */
        $this->_sess_opt['save_path'] =
            isSet($_param['save_path']) ? $_param['save_path'] : 'db_esessions';

        if (isSet($_param['name'])) {
            // Check to make sure name is only alphanumeric
            if (!$this->pregMatches('/^[a-zA-Z0-9]+/', $_param['name'])) {

                // Warning: Session configuration option session.name alpha
                $this->_setWrnMsg('NAME_INVALID', NULL, $_param['name']);

                $this->_sess_opt['name'] = 'eSESSION';

            } else {
                $this->_sess_opt['name'] = $_param['name'];
            }

        } else {

            $this->_sess_opt['name'] = 'eSESSION';
        }

        $this->_sess_opt['save_handler'] =
            isSet($_param['save_handler']) ? $_param['save_handler'] : 'user';

        if (isSet($_param['auto_start']))
            $this->_sess_opt['auto_start'] = (bool) $_param['auto_start'];

        if (isSet($_param['gc_probability']))
            $this->_sess_opt['gc_probability'] = (int)
                (0 == intval($_param['gc_probability'])) ?
                    10 : intval($_param['gc_probability']);

        if (isSet($_param['gc_divisor']))
            $this->_sess_opt['gc_divisor'] = (int)
                (0 == intval($_param['gc_divisor'])) ?
                    100 : intval($_param['gc_divisor']);

        /**
         * There maybe a bug with sessions lifetime under Windows and FAT32 in
         * PHP version 4.1.0/1/2. See: http://bugs.php.net/bug.php?id=14798
         */
        if (isSet($_param['gc_maxlifetime']))
            $this->_sess_opt['gc_maxlifetime'] =
               intval($_param['gc_maxlifetime']);

        if (isSet($_param['serialize_handler']))
            $this->_sess_opt['serialize_handler'] =
                $_param['serialize_handler'];

        if (isSet($_param['cookie_lifetime']))
            $this->_sess_opt['cookie_lifetime'] =
               intval($_param['cookie_lifetime']);

        if (isSet($_param['cookie_path']))
            $this->_sess_opt['cookie_path']   = $_param['cookie_path'];

        if (isSet($_param['cookie_domain']))
            $this->_sess_opt['cookie_domain'] = $_param['cookie_domain'];

        if (isSet($_param['cookie_secure'])) {
            $this->_sess_opt['cookie_secure'] = $_param['cookie_secure'];

            if ((0 === strcmp($this->_sess_opt['cookie_secure'], '1')) &&
                (!$this->secureConnection())) {

                // Warning: You are setting session.cookie_secure - not secure
                $this->_setWrnMsg('NOT_SECURE');

            }

        }

        if (isSet($_param['use_cookies']))
            $this->_sess_opt['use_cookies'] = (bool) $_param['use_cookies'];

        if ((isSet($_param['use_only_cookies'])) &&
            (version_compare(PHP_VERSION, '4.3.0', '>=')))
            $this->_sess_opt['use_only_cookies'] =
               (bool) $_param['use_only_cookies'];

        if (isSet($_param['referer_check']))
            $this->_sess_opt['referer_check'] = $_param['referer_check'];

        if (isSet($_param['entropy_file']))
            $this->_sess_opt['entropy_file'] = $_param['entropy_file'];

        if (isSet($_param['entropy_length']))
            $this->_sess_opt['entropy_length'] =
               intval($_param['entropy_length']);

        if (isSet($_param['cache_limiter']))
            $this->_sess_opt['cache_limiter'] = $_param['cache_limiter'];

        if (isSet($_param['cache_expire']))     // For PHP version >= 4.2.0
            $this->_sess_opt['cache_expire'] = intval($_param['cache_expire']);

        if (isSet($_param['bug_compat_42']))
            $this->_sess_opt['bug_compat_42'] = (bool) $_param['bug_compat_42'];

        if (isSet($_param['bug_compat_warn']))
            $this->_sess_opt['bug_compat_warn'] = (bool)
                $_param['bug_compat_warn'];

        if (version_compare(PHP_VERSION, '5.0.0', '>=')) {

           // session.use_trans_sid can be changed in a script from v5.0.0 on
           if (isSet($_param['use_trans_sid']))
               $this->_sess_opt['use_trans_sid'] = $_param['use_trans_sid'];

           if (isSet($_param['hash_function']))
               $this->_sess_opt['hash_function'] = $_param['hash_function'];

           if (isSet($_param['hash_bits_per_character']))
               $this->_sess_opt['hash_bits_per_character'] =
                   $_param['hash_bits_per_character'];
        }


        /**
         * Set session configuration options. Values will remain during the
         * script's execution, and will be restored at the script's ending.
         */
        foreach ($this->_sess_opt as $_key => $_value) {

            if (FALSE === $this->_setSessOption($_key, $_value))
                // Warning: Session configuration option ... not assigned
                $this->_setWrnMsg('SESS_OPTION', NULL, $_key, $_value);

        }

        /**
         * Support for url_rewriter.tags option since it relates to sessions.
         * Example: Like you might want to add the iframe=src to it, as in:
         * a=href,area=href,frame=src,iframe=src,form=,fieldset=,input=src
         */
        if (isSet($_param['tags'])) {
            if (FALSE === $this->_setSessOption('url_rewriter.tags',
                                                $_param['tags'],
                                                FALSE))
                // Warning: Configuration option [url_rewriter.tags] not assign
                $this->_setWrnMsg('URL_TAGS', NULL, $_param['tags']);

        }


        /**
         * Security Level: A numerical method to represent access authority for
         * current session/web page. The lower the number means the higher the
         * security clearance. In other words, security level 5 can only access
         * all level 5 or higher session/web pages, and nothing lower than 5.
         * Range 0-255. The default is 128. For administration or sensitive pages
         * use 0 (zero) or 1 (one) as a value. A security level can't be changed
         * after a session has been created. So, the first time the session
         * is created with a set security level, it dictates the access
         * authority for the rest of that active session.
         */
        $this->_SEC_LEVEL = isSet($_param['security_level']) ?
                                intval($_param['security_level']) : 128;


        /**
         * Get current setting of sessions life duration in seconds.
         * This is the number of seconds that is allowed to pass since
         * the last time the session data was accessed.
         * Otherwise, default it to 1440 seconds (24 minutes).
         */
        $this->_SESS_LIFE = intval(ini_get('session.gc_maxlifetime'));
        $this->_SESS_LIFE = (int) ($this->_SESS_LIFE < 1) ?
                                   1440 : $this->_SESS_LIFE;

        /**
         * Calculates maximum life of session in seconds. It's three times
         * the length of gc_maxlifetime (for the default). For example: if
         * gc_maxlifetime is 1440 seconds (24 minutes), then session
         * timeout maximum is set to 4320 seconds (72 minutes). The timeout
         * value can't be less than the gc_maxlifetime value.
         */
        if (isSet($_param['timeout'])) {
            $this->_SESS_TIMEOUT = (int)
                (intval($_param['timeout']) < $this->_SESS_LIFE) ?
                    $this->_SESS_LIFE * 3 : intval($_param['timeout']);
        } else {
            $this->_SESS_TIMEOUT = (int) $this->_SESS_LIFE * 3;
        }


        /**
         * Must not send any HTML output before session_start() is invoked.
         * Set a warning message if HTML headers have been sent to the browser.
         * Exception: ob_start() for buffering.
         */
        if (!$_buffer) {
            if (version_compare(PHP_VERSION, '4.3.0', '>=')) {
                $_filename = '';
                $_linenbr  = (int) 0;
                if (headers_sent($_filename, $_linenbr)) {
                    // Warning: HTTP headers already sent - with detail
                    $this->_setWrnMsg('HEADER_SENT_1', NULL, $_filename,
                                      $_linenbr);
                }

            } else
            if (headers_sent()) {
                // Warning: HTTP headers have already been sent - no detail
                $this->_setWrnMsg('HEADER_SENT_2');
            }
        }


        /**
         * Assign session storage tasks to methods in this class.
         */
        if (!session_set_save_handler(array(&$this, '_sessDBOpen'),
                                      array(&$this, '_sessDBClose'),
                                      array(&$this, '_sessDBRead'),
                                      array(&$this, '_sessDBWrite'),
                                      array(&$this, '_sessDBDestroy'),
                                      array(&$this, '_sessDBGC')
                                     )) {

            // execution of session_set_save_handler() failed
            $this->_setErrMsg('HANDLER_FAIL');
            $this->_handleErrors(STOP);     // Severe error - exit script

        }

        $this->_sess_name = session_name();


        /**
         * Set whether the magic quotes GPC that effects slashing quotes of
         * GET/POST/COOKIE data is set.
         */
        $this->_MAGIC_QUOTES_GPC = (bool) get_magic_quotes_gpc();


        /**
         * Set whether the magic quotes runtime that effects slashing quotes of
         * external data sources is set.
         */
        $this->_MAGIC_QUOTES_RUNTIME = (bool) get_magic_quotes_runtime();


        $this->_ARG_SEP = ('' == ini_get('arg_separator.output')) ? '&' :
                                 ini_get('arg_separator.output');


        /**
         * Set TRUE to force addslashes() to occur on session data regardless
         * of the magic quotes runtime option setting. Default is on (TRUE).
         * If you find that data has slashes incorrectly, then turn this off.
         */
        $this->_SLASH_ANYWAY = (bool) isSet($_param['slash_anyway']) ?
                                            $_param['slash_anyway']  : TRUE;

        /**
         * Set TRUE to force stripslashes() to occur on encrypted session data
         * regardless of the magic quotes runtime option setting. The default
         * is on (TRUE). If you find that data is saved incorrectly, then
         * turn this off.
         */
        $this->_STRIP_ANYWAY = (bool) isSet($_param['strip_anyway']) ?
                                            $_param['strip_anyway']  : TRUE;


        /**
         * Try and save the current session ID if one is defined already.
         */
        if (isSet($_COOKIE[$this->_sess_name]))
            $_sess_id_set = $_COOKIE[$this->_sess_name];
        else
        if (isSet($GLOBALS[$this->_sess_name]))
            $_sess_id_set = $GLOBALS[$this->_sess_name];
        else
            $_sess_id_set = NULL;


        /**
         * Create a new session ID when requested, or when the session ID length
         * is less than the standard maximum if a session hasn't been started
         * or created already ($_COOKIE or $GLOBALS[$this->_sess_name]).
         */
        if (($_new_sess_ID) ||
            (($this->_sess_ID_len < $this->_MAX_SESS_ID_LEN) &&
             (!isSet($_COOKIE[$this->_sess_name])) &&
             (!isSet($GLOBALS[$this->_sess_name])))) {
            $this->_setNewSessID($_sess_ID);
        }


        /**
         * When warning flag is set and there's warning messages, stop
         * execution here. No point in proceeding.
         */
        $this->_handleErrors();


        /**
         * By default this class will do a session_start(), however, you may
         * want to turn it off when using the maintenance type of functions.
         */
        $_do_sess_start = (bool) isSet($_param['session_start']) ?
                                       $_param['session_start']  : TRUE;

        /**
         * When session start is requested and $_SESSION doesn't exist, it
         * means that the auto start option is not on, and no session_start()
         * has been invoked yet. So, start a session. This is safer than
         * checking the 'session.auto_start' configuration setting with
         * ini_get(). Otherwise, just make a manual connection to the DB for
         * now (to make the maintenance type of member functions available for
         * use). You would then have to invoke the session_start() from within
        * your script (if desired). If the session is started in your script,
         * then another call to _sessDBOpen will be invoked but it will be
         * handled alright.
         */
        if (($_do_sess_start) &&
            (!isSet($_SESSION)))
            session_start();
        else
        if (!$_do_sess_start)
            $this->_sessDBOpen($this->_sess_opt['save_path'], $this->_sess_name);


        /**
         * If there was a previous session ID set and we now have a new one,
         * then delete the old session row right away without waiting for it to
         * expire first (for security reasons).
         */
        if (($_do_sess_start) &&
            (!empty($_sess_id_set))) {
            if (0 !== strcmp($_sess_id_set, session_id()))
                $this->deleteSession($_sess_id_set);
        }


        /**
         * There is a form bug in IE v6 while using PHP sessions which causes
         * the loss of filled-in information when returning to the form, after
         * already leaving the form page (by any means). A work around is to use
         * the HTTP 1.1 header "Cache-Control: private"
         */
        if ($_IE_fix)
            $this->sendCacheHeader('private');

    }   // End of DB_eSession Constructor



    /**
     * _formatFont - Formats the HTML font color and size attributes to the
     * text that's passed to it.
     *
     * @param  string $_text Text or the data to be enclosed in the font attr.
     * @param  string $_color The font color to use (any valid HTML syntax).
     * @param  string $_size The font size to use (any valid HTML syntax).
     * @return string Returns the text with the font and size attributes added.
     * @access private
     */
    function _formatFont($_text, $_color = 'BLACK', $_size = '+0')
    {
        if (empty($_color))
            $_color = 'BLACK';

        if (empty($_size))
            $_size  = '+0';

        return '<FONT COLOR="' . $_color . '"'  .
                     ' SIZE="' . $_size  . '">' .
                        $_text . '</FONT>';
    }


    /**
     * _setErrMsg - Sets an error message. Fills-in any passed values in order
     * to produce a formatted error message.
     *
     * @param  string $_errMsgKey Name of key to match against array of errors.
     * @param  string $_SQL The value of the last executed SQL command (if any).
     * @param  mixed  Pass one to many arguments to use as fill-in values for
     *                the error messages.
     * @return bool   Returns TRUE when error message set, or FALSE on failure.
     * @access private
     */
    function _setErrMsg ($_errMsgKey = '', $_SQL = NULL)
    {

        $_lang = $this->_CURRENT_LANG;

        if (!isSet($this->_ERR_MSGS[$_errMsgKey][$_lang])) {

            if (isSet($this->_ERR_MSGS[$_errMsgKey][$this->_DEFAULT_LANG])) {
                // Error message not found in current lang; switching to def.
                $_lang = $this->_DEFAULT_LANG;
            } else {
                // Could not find the supplied key of error message
                $this->_errors .= '$_ERR[\'' . $_errMsgKey . "']\n";
                return FALSE;
            }
        }

        if (@func_num_args() > 2) {     // Do we have extra argument values?

            $_arg = @func_get_args();

            array_shift($_arg);         // Remove $_errMsgKey value passed
            array_shift($_arg);         // Remove $_SQL value passed

            $_cnt = count($_arg);

            /**
             * Create a pattern for the number of arguments passed
             */
            $_patterns = str_repeat('/%s/i,', $_cnt);
            $_patterns = explode(',', $_patterns);
            array_pop($_patterns);      // Remove extra entry created by explode

            /**
             * When no detail requested, replace argument values with [xxx]
             */
            for ($i = 0; $i < $_cnt; $i++) {
                if ($this->_DETAIL_ERR_MSGS)
                    // Slash $ signs that's in the data for displaying correctly
                    $_arg[$i] = str_replace('$', '\$', $_arg[$i]);
                else
                    $_arg[$i] = '[xxx]';

            }

            /**
             * Replace the '%s' place holder with argument values passed
             * sprintf() doesn't allow array arguments.
             */
            $_err = @preg_replace($_patterns,
                                  $_arg,
                                  $this->_ERR_MSGS[$_errMsgKey][$_lang],
                                  1
                                 );

        } else {    // No extra arguments were passed

            $_err = $this->_ERR_MSGS[$_errMsgKey][$_lang];
        }

        if (!empty($_SQL)) {

            switch ($this->_DETAIL_ERR_MSGS) {

                case TRUE:

                    $_err .= "SQL: $_SQL\nErr # " .
                             @mysql_errno($this->_dbh) . ': '  .
                             @mysql_error($this->_dbh) . "\n";

                    break;

                default:

                    $_err .= "SQL Err # " .
                             @mysql_errno($this->_dbh) . ': '  .
                             @mysql_error($this->_dbh) . "\n";
            }

        }

        $this->_errors .= $_err;

        return TRUE;
    }


    /**
     * _setWrnMsg - Sets a warning message. Fills-in any passed values in order
     * to produce a formatted warning message.
     *
     * @param  string $_wrnMsgKey Name of key to match against array of warnings
     * @param  string $_SQL The value of the last executed SQL command (if any).
     * @param  mixed  Pass one to many arguments to use as fill-in values for
     *                the warning messages.
     * @return bool   Returns TRUE when warning message set, or FALSE on failure
     * @access private
     */
    function _setWrnMsg ($_wrnMsgKey = '', $_SQL = NULL)
    {

        $_lang = $this->_CURRENT_LANG;

        if (!isSet($this->_WRN_MSGS[$_wrnMsgKey][$_lang])) {

            if (isSet($this->_WRN_MSGS[$_wrnMsgKey][$this->_DEFAULT_LANG])) {
                // Warning message not found in current lang; switching to def.
                $_lang = $this->_DEFAULT_LANG;
            } else {
                // Could not find the supplied key of warning message
                $this->_warnings .= '$_WRN[\'' . $_wrnMsgKey . "']\n";
                return FALSE;
            }
        }

        if (@func_num_args() > 2) {     // Do we have extra argument values?

            $_arg = @func_get_args();

            array_shift($_arg);         // Remove $_wrnMsgKey value passed
            array_shift($_arg);         // Remove $_SQL value passed

            $_cnt = count($_arg);

            /**
             * Create a pattern for the number of arguments passed
             */
            $_patterns = str_repeat('/%s/i,', $_cnt);
            $_patterns = explode(',', $_patterns);
            array_pop($_patterns);      // Remove extra entry created by explode

            /**
             * When no detail requested, replace argument values with [xxx]
             */
            for ($i = 0; $i < $_cnt; $i++) {
                if ($this->_DETAIL_ERR_MSGS)
                    // Slash $ signs that's in the data for displaying correctly
                    $_arg[$i] = str_replace('$', '\$', $_arg[$i]);
                else
                    $_arg[$i] = '[xxx]';

            }

            /**
             * Replace the '%s' place holder with argument values passed
             * sprintf() doesn't allow array arguments.
             */
            $_wrn = @preg_replace($_patterns,
                                  $_arg,
                                  $this->_WRN_MSGS[$_wrnMsgKey][$_lang],
                                  1
                                 );

        } else {    // No extra arguments were passed

            $_wrn = $this->_WRN_MSGS[$_wrnMsgKey][$_lang];
        }

        if (!empty($_SQL)) {

            switch ($this->_DETAIL_ERR_MSGS) {

                case TRUE:

                    $_wrn .= "SQL: $_SQL\nErr # " .
                             @mysql_errno($this->_dbh) . ': '  .
                             @mysql_error($this->_dbh) . "\n";

                    break;

                default:

                    $_wrn .= "SQL Err # " .
                             @mysql_errno($this->_dbh) . ': '  .
                             @mysql_error($this->_dbh) . "\n";
            }

        }

        $this->_warnings .= $_wrn;

        return TRUE;
    }


    /**
     * _handleErrors - Detects if errors have occurred and ends the script when
     * the flag is set to stop. Errors are always displayed before warnings.
     *
     * @param  bool   $_stop Flags whether to stop script anyway (on severe
     *                errors.
     * @return bool   Always returns TRUE.
     * @access private
     */
    function _handleErrors($_stop = FALSE)
    {

        if (($this->warningsExist()) &&
            ($this->_stop_on_warn))  {

             if ($this->errorsExist())
                 echo $this->getErrors($this->_ERR_COLOR, $this->_ERR_SIZE);

             echo $this->getWarnings($this->_WRN_COLOR, $this->_WRN_SIZE);

            exit;
        }

        if (($this->errorsExist()) &&
            ($this->_stop_on_error)) {

            echo $this->getErrors($this->_ERR_COLOR, $this->_ERR_SIZE);

            if ($this->warningsExist())
                echo $this->getWarnings($this->_WRN_COLOR, $this->_WRN_SIZE);

            exit;
        }

        if (!is_bool($_stop))
            $_stop = FALSE;

        if ($_stop) {

            if ($this->errorsExist())
                echo $this->getErrors($this->_ERR_COLOR, $this->_ERR_SIZE);

            if ($this->warningsExist())
                echo $this->getWarnings($this->_WRN_COLOR, $this->_WRN_SIZE);

            exit;
        }

        return TRUE;
    }


    /**
     * _setSessOption - Sets the value of the given session configuration option
     *
     * @param  string $_config_option Session related configuration option
     * @param  mixed  $_value The value to assign the configuration option
     * @param  bool   $_check_sess Flags whether to verify 'session.' exists
     * @return mixed  Returns the old value on success, FALSE on failure.
     * @access private
     */
    function _setSessOption($_config_option, $_value, $_check_sess = TRUE)
    {

        $_config_option = trim($_config_option);

        if (empty($_config_option)) {

            return FALSE;

        } else {

            // When TRUE, check to see if 'session.' is included
            if ($_check_sess) {
                // Add 'session.' if not included in $_config_option
                if (0 !== strpos(strtolower($_config_option), 'session.'))
                    $_config_option = 'session.' . $_config_option;

            }

            return ini_set($_config_option, $_value);

        }
    }


    /**
     * _genString - Generates random characters from 1 to 32 in length.
     * 32 characters is the default when length not specified.
     *
     * @param  int    $_length The number of characters to generate.
     * @return string Returns a string of the requested number of characters.
     * @access private
     */
    function _genString($_length = 0)
    {

        $_length = intval($_length);

        if (($_length < 1) ||
            ($_length > $this->_MAX_SESS_ID_LEN))
             $_length = $this->_MAX_SESS_ID_LEN;

        /**
         * Random number seeding already performed in constructor.
         */
        $_string = md5(uniqid(mt_rand(), TRUE));

        return substr($_string, 0, $_length);

    }


    /**
     * _setNewSessID - Creates and sets a new session ID.
     * This is called before session_start() and before any output to the
     * browser.
     *
     *   Note: It's possible if you have PHP version 4.3.2 or higher and are
     *         using the default maximum session length (32), to call
     *         this member function, without an argument, & no output sent
     *         to the browser, after a session_start() has been executed.
     *         That will invoke session_regenerate_id(), which seems to work
     *         correctly (member could have been made public for that reason).
     *         If session_start() has been executed already, then doing
     *         session_id('somevalue') will NOT change the session ID properly.
     *         It's less problematic to keep as a private method (and call
     *         before a session_start()).
     *
     * @param  string $_sess_id An optional session ID to use (of _sess_ID_len)
     * @return string Returns the new session ID.
     * @access private
     */
    function _setNewSessID($_sess_id = NULL)
    {

        global $HTTP_GET_VARS, $HTTP_POST_VARS, $HTTP_COOKIE_VARS;

        $_continue = TRUE;

        /**
         * If supplied with a session ID, validate it and use it when it's good.
         */
        if (strlen($_sess_id) == $this->_sess_ID_len) {
            if (!$this->pregMatches('/^[a-zA-Z0-9]+/', $_sess_id)) {
                // Warning: Custom session ID passed is invalid.
                $this->_setWrnMsg('SESS_INVALID', NULL, $_sess_id);

                $this->_handleErrors();

                // Ignoring value and assigning a new session ID.
                $this->_setWrnMsg('NEW_SESS_ID');

            } else {

                session_id($_sess_id);

                $_continue = FALSE;

            }

        }


        /**
         * Use session_regenerate_id() when the session ID length desired is the
         * same as the maximum allowed, because it generates the maximum length.
         * It is only available in PHP version 4.3.2 or higher. As of PHP 4.3.3,
         * if session cookies are enabled, use of session_regenerate_id() is
         * supposed to submit a new session cookie with the new session id.
         */
        if (($_continue) &&
            ($this->_sess_ID_len == $this->_MAX_SESS_ID_LEN) &&
            (version_compare(PHP_VERSION, '4.3.2', '>='))) {
            if (session_regenerate_id()) {

                $_sess_id  = session_id();

                $_continue = FALSE;

            }

        }


        if ($_continue) {

            $_sess_id = $this->_genString($this->_sess_ID_len);

            session_id($_sess_id);
        }

        // To be safe set...
        if (isSet($_REQUEST[$this->_sess_name]))
            $_REQUEST[$this->_sess_name] = $_sess_id;

        if (isSet($_GET[$this->_sess_name]))
            $_GET[$this->_sess_name] = $_sess_id;

        if (isSet($HTTP_GET_VARS[$this->_sess_name]))
            $HTTP_GET_VARS[$this->_sess_name] = $_sess_id;

        if (isSet($_POST[$this->_sess_name]))
            $_POST[$this->_sess_name] = $_sess_id;

        if (isSet($HTTP_POST_VARS[$this->_sess_name]))
            $HTTP_POST_VARS[$this->_sess_name] = $_sess_id;

        if (isSet($_COOKIE[$this->_sess_name]))
            $_COOKIE[$this->_sess_name]  = $_sess_id;

        // May not actually change until next refresh
        if (isSet($HTTP_COOKIE_VARS[$this->_sess_name]))
            $HTTP_COOKIE_VARS[$this->_sess_name] = $_sess_id;

        if (isSet($GLOBALS[$this->_sess_name]))
            $GLOBALS[$this->_sess_name] = $_sess_id;

        return $_sess_id;
    }


    /**
     * _getSecID - Creates an MD5 of a users trace information. Used to verify
     * session belongs to same user. Not full-proof but adequate.
     * Note: Not using HTTP_ACCEPT since results are inconsistent in IE6.
     *
     * @return string  An MD5 hash of secret keys plus server collected data.
     * @access private
     */
    function _getSecID()
    {

        $_type_used = NULL;
        $_IP = $this->getIPAddr($_type_used);

        $_agent    = isSet($_SERVER['HTTP_USER_AGENT']) ?
                           $_SERVER['HTTP_USER_AGENT']  : 'NO USER AGENT';

/* Rev 1.0.2: Found IE 6 to not return consistent results (under HTTPS)
        $_encoding = isSet($_SERVER['HTTP_ACCEPT_ENCODING']) ?
                           $_SERVER['HTTP_ACCEPT_ENCODING']  : 'NO ENCODING';
*/
        return md5($this->_KEY_PREFIX  .
                   $_IP                .
                   $_type_used         .
                   $_agent             .
//***              $_encoding          .    Rev 1.0.2: Found as unreliable
                   $this->_KEY_SUFFIX
                  );

    }


    /**
     * _getSessTrace - Creates a concatenated string of users trace information.
     * Used for tracing IP in case of unauthorized intruder. Not using secret
     * key here, or in the same order as session security ID. MySQL will
     * truncate at INSERT if character length is longer than column limit.
     * The '~' is used as a delimiter.
     *
     * @return string  A non-hash of server collected data used for tracing.
     * @access private
     */
    function _getSessTrace()
    {

        $_type_used = NULL;
        $_IP = $this->getIPAddr($_type_used);

        $_agent    = isSet($_SERVER['HTTP_USER_AGENT']) ?
                           $_SERVER['HTTP_USER_AGENT']  : 'NO USER AGENT';

        $_accept   = isSet($_SERVER['HTTP_ACCEPT']) ?
                           $_SERVER['HTTP_ACCEPT']  : 'NO ACCEPT';

        $_encoding = isSet($_SERVER['HTTP_ACCEPT_ENCODING']) ?
                           $_SERVER['HTTP_ACCEPT_ENCODING']  : 'NO ENCODING';

        return ($_type_used  . '~' .
                $_IP         . '~' .
                $_agent      . '~' .
                $_accept     . '~' .
                $_encoding
               );

    }


    /**
     * _sessDBOpen - Connects and selects the database.
     *
     * @param  string $_save_path Session save location path.
     * @param  string $_session_name Alphanumeric session name (used in URL's).
     * @return bool   TRUE on good connection and select of DB, FALSE on errors.
     * @access private
     */
    function _sessDBOpen($_save_path, $_session_name)
    {

        // Override _sess_name with what PHP thinks is the session name.
        $this->_sess_name = $_session_name;

        /**
         * When no resource link initially supplied, connect to database.
         */
       if (!is_resource($this->_dbh)) {
            if ($this->_db['db_persistent']) {
                $this->_dbh = @mysql_pconnect($this->_db['db_host'],
                                              $this->_db['db_user'],
                                              $this->_db['db_pswd']
                                             );
            } else {
                $this->_dbh = @mysql_connect ($this->_db['db_host'],
                                              $this->_db['db_user'],
                                              $this->_db['db_pswd']
                                             );
            }
        }

        if (!$this->_dbh)

            // Connection to MySQL server failed
            $this->_setErrMsg('CONNECT_FAIL');     // No error code available
        else {
            $_db_select = @mysql_select_db($this->_db['db_name'], $this->_dbh);

            if (!$_db_select)
                // Could not select MySQL database
                $this->_setErrMsg('SELECTDB_FAIL', 'mysql_select_db',
                                  $this->_db['db_name']);
        }


        $this->_handleErrors();


        if ((!$this->_dbh) ||
            (!$_db_select)) {

            return (bool) FALSE;

        } else {

            $this->_mysql_ver = @mysql_get_server_info($this->_dbh);
            return (bool) TRUE;
        }
    }


    /**
     * _sessDBClose - Closes the connection to the database for non-persistent
     *                connections.
     *
     * @return bool   Always returns TRUE.
     * @access private
     */
    function _sessDBClose()
    {

        if ((!$this->_db['db_persistent']) &&
            (is_resource($this->_dbh)))
            if (!@mysql_close($this->_dbh))
                // Warning: Could not close MySQL database
                $this->_setWrnMsg('CLOSEDB_FAIL', 'mysql_close',
                                  $this->_db['db_name']);

        $this->_handleErrors();

        return (bool) TRUE;
    }


    /**
     * _sessDBRead - Retrieves session data from the table. If encrypted, the
     * data will automatically be decrypted before returning the value back.
     *
     * @param  string $_sess_id Session ID of the row to retrieve.
     * @return string The session data is returned or an empty string on error.
     * @access private
     */
    function _sessDBRead($_sess_id)
    {

        $_time      = time();
        $_sec_level = $this->_SEC_LEVEL;
        $_sec_ID    = $this->_getSecID();

        $_sql  = 'SELECT '    . $this->_db['tb_vl_col']  .
                         ', ' . $this->_db['tb_iv_col']  .
                 '  FROM '  . $this->_db['tb_name']    .
                 ' WHERE (' . $this->_db['tb_id_col']  . " = '$_sess_id')" .
                 '   AND (' . $this->_db['tb_sl_col']  . " <= '$_sec_level')" .
                 '   AND (' . $this->_db['tb_ex_col']  . " > '$_time')" .
                 '   AND (' . $this->_db['tb_to_col']  . " > '$_time')" .
                 '   AND (' . $this->_db['tb_lk_col']  . " = '0')" .
                 '   AND (' . $this->_db['tb_si_col']  . " = '$_sec_ID')";

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {

            // Main select/read query failed. Could not read session data
            $this->_setErrMsg('READ_FAILED', $_sql, $_sess_id);

            $this->_handleErrors();

            return (string) ''; // Return empty string on error

        } else {

            $_row = @mysql_fetch_assoc($_result);

            if (!$_row) {

                return (string) ''; // No data found, return an empty string

            } else {

                $_row[$this->_db['tb_vl_col']] =
                    isSet($_row[$this->_db['tb_vl_col']]) ?
                          $_row[$this->_db['tb_vl_col']]  : '';

                $_row[$this->_db['tb_iv_col']] =
                    isSet($_row[$this->_db['tb_iv_col']]) ?
                          $_row[$this->_db['tb_iv_col']]  : '';

                if ($this->_MAGIC_QUOTES_RUNTIME) {
                    $_row[$this->_db['tb_vl_col']] =
                        stripslashes($_row[$this->_db['tb_vl_col']]);

                    $_row[$this->_db['tb_iv_col']] =
                        stripslashes($_row[$this->_db['tb_iv_col']]);
                }

                /**
                 * Decrypt the data if it was encrypted
                 */
                if ((!empty($_row[$this->_db['tb_iv_col']])) &&
                    (!empty($_row[$this->_db['tb_vl_col']]))) {

                    $_row[$this->_db['tb_vl_col']] =
                        $this->sessDecrypt($_row[$this->_db['tb_vl_col']],
                                           $_row[$this->_db['tb_iv_col']],
                                           TRUE);
                }
                                      // When invoked, did decrypt fail?
                return (string) (FALSE === $_row[$this->_db['tb_vl_col']]) ?
                                 '' : $_row[$this->_db['tb_vl_col']];

            }
        }
    }


    /**
     * _sessDBWrite - Inserts or updates session data to the table.
     *
     * @param  string $_sess_id Session ID which is used as the primary key.
     * @param  string $_sess_data Session data to save in the database.
     * @return bool   TRUE on a successful Insert/Update, and FALSE on error.
     * @access private
     */
    function _sessDBWrite($_sess_id, $_sess_data)
    {

        $_time      = time();
        $_expiry    = $_time + $this->_SESS_LIFE;
        $_timeout   = $_time + $this->_SESS_TIMEOUT;
        $_sec_level = $this->_SEC_LEVEL;
        $_sec_ID    = $this->_getSecID();
        $_trace     = addslashes($this->_getSessTrace());
        $_enc_iv    = '';

        /**
         * Encrypt the whole session data when flag is set to TRUE.
         */
        if ($this->_ENCRYPT) {

            /**
             * When magic quotes GPC option is on or strip anyway option
             * is on, strip session data before encrypting. We don't need
             * the slashes when encrypting because the data value will change.
             */
            if (($this->_MAGIC_QUOTES_GPC) ||
                ($this->_STRIP_ANYWAY))
                $_sess_data = stripslashes($_sess_data);

            $_sess_data = $this->sessEncrypt($_sess_data, $_enc_iv, TRUE);
        }

        /**
         * When magic quotes GPC option is off or slash anyway option
         * is on, slash quotes in session data and encryption IV.
         */
        if ((!$this->_MAGIC_QUOTES_GPC) ||
            ($this->_SLASH_ANYWAY)) {

            $_sess_data = addslashes($_sess_data);
            $_enc_iv    = addslashes($_enc_iv);
        }

        $_sql = 'INSERT INTO ' . $this->_db['tb_name']     .
                          ' (' . $this->_db['tb_id_col']   .
                          ', ' . $this->_db['tb_sl_col']   .
                          ', ' . $this->_db['tb_cr_col']   .
                          ', ' . $this->_db['tb_ex_col']   .
                          ', ' . $this->_db['tb_to_col']   .
                          ', ' . $this->_db['tb_lk_col']   .
                          ', ' . $this->_db['tb_vl_col']   .
                          ', ' . $this->_db['tb_iv_col']   .
                          ', ' . $this->_db['tb_si_col']   .
                          ', ' . $this->_db['tb_tr_col']   .
                  ') VALUES (' .
                               "'$_sess_id'"   .
                             ", '$_sec_level'" .
                             ", '$_time'"      .
                             ", '$_expiry'"    .
                             ", '$_timeout'"   .
                             ", '0'"           .
                             ", '$_sess_data'" .
                             ", '$_enc_iv'"    .
                             ", '$_sec_ID'"    .
                             ", '$_trace'"     .
                            ')';

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {

            $_errno = @mysql_errno($this->_dbh);

            if ((1062 == $_errno) ||    // ER_DUP_ENTRY
                (1022 == $_errno)) {    // ER_DUP_KEY

                $_sql = 'UPDATE ' . $this->_db['tb_name']     .
                          ' SET '                             .
                                    $this->_db['tb_ex_col']   .
                                    "='$_expiry'"             .
                             ', ' . $this->_db['tb_vl_col']   .
                                    "='$_sess_data'"          .
                             ', ' . $this->_db['tb_iv_col']   .
                                    "='$_enc_iv'"             .
                        ' WHERE ('. $this->_db['tb_id_col']   .
                                    " = '$_sess_id')"         .
                        '   AND ('. $this->_db['tb_cr_col']   .
                                    " < '$_time')"            .
                        '   AND ('. $this->_db['tb_sl_col']   .
                                    " <= '$_sec_level')"      .
                        '   AND ('. $this->_db['tb_ex_col']   .
                                    " > '$_time')"            .
                        '   AND ('. $this->_db['tb_to_col']   .
                                    " > '$_time')"            .
                        '   AND ('. $this->_db['tb_lk_col']   .
                                    " = '0')"                 .
                        '   AND ('. $this->_db['tb_si_col']   .
                                    " = '$_sec_ID')";

                $_result = @mysql_query($_sql, $this->_dbh);

                if (!$_result) {

                    // Update failed. Could not update session data
                    $this->_setErrMsg('UPDATE_FAILED', $_sql, $_sess_id);

                }

            } else {

                // Insert failed. Could not insert session data
                $this->_setErrMsg('INSERT_FAILED', $_sql, $_sess_id);

                if (1064 == $_errno) {  // ER_PARSE_ERROR
                    // Data may contain single quotes without backslashes
                    $this->_setErrMsg('PARSE_ERROR', $_sql);

                    if (($this->_MAGIC_QUOTES_GPC) &&
                        (!$this->_SLASH_ANYWAY)) {

                        // Recommend to turn on param['slash_anyway'] to TRUE
                        $this->_setErrMsg('RECOMD_SLASH');

                    }
                }

            }
        }

        $this->_handleErrors();

        return (bool) $_result;
    }


    /**
     * _sessDBDestroy - Deletes session data from the table. Automatically
     *                  executed when session_destroy() is executed.
     *
     * @param  string  $_sess_id Session ID of the row to delete.
     * @return bool    TRUE on a successful delete, and FALSE on error.
     * @access private
     */
    function _sessDBDestroy($_sess_id)
    {

        global $HTTP_GET_VARS, $HTTP_POST_VARS, $HTTP_COOKIE_VARS;


        $_sql = 'DELETE FROM ' . $this->_db['tb_name'] .
                     ' WHERE ' . $this->_db['tb_id_col']  .
                                 " = '$_sess_id'";

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {
            // Destroy failed. Could not delete session data
            $this->_setErrMsg('DESTROY_FAIL', $_sql, $_sess_id);
            $this->_handleErrors();
        }


        session_unset();

        // To be safe remove...
        if (isSet($_REQUEST[$this->_sess_name]))
            unset($_REQUEST[$this->_sess_name]);

        if (isSet($_GET[$this->_sess_name]))
            unset($_GET[$this->_sess_name]);

        if (isSet($HTTP_GET_VARS[$this->_sess_name]))
            unset($HTTP_GET_VARS[$this->_sess_name]);

        if (isSet($_POST[$this->_sess_name]))
            unset($_POST[$this->_sess_name]);

        if (isSet($HTTP_POST_VARS[$this->_sess_name]))
            unset($HTTP_POST_VARS[$this->_sess_name]);

        if (isSet($_COOKIE[$this->_sess_name]))
            unset($_COOKIE[$this->_sess_name]);

        if (isSet($HTTP_COOKIE_VARS[$this->_sess_name]))
            unset($HTTP_COOKIE_VARS[$this->_sess_name]);

        if (isSet($GLOBALS[$this->_sess_name]))
            unset($GLOBALS[$this->_sess_name]);

        return (bool) $_result;
    }


    /**
     * _sessDBGC - Deletes expired session data from the table. It deletes
    *             sessions that expire by inactivity timeout, absolute
     *             timeout, or that are flagged as locked.
     *
     * @param  int    $_maxlifetime Session's life setting in seconds.
     * @return bool   TRUE on successful deletes, and FALSE on error.
     * @access private
     */
    function _sessDBGC($_maxlifetime)
    {

        $_time = time();

        $_sql = 'DELETE FROM ' . $this->_db['tb_name'] .
                     ' WHERE ' .
                               '(' . $this->_db['tb_ex_col'] .
                               " < '" . ($_time - $_maxlifetime) . "')" .
                               ' OR ' .
                               '(' . $this->_db['tb_to_col'] . " < '$_time')";

        if ($this->_GC_DEL_LOCKED) {
            $_sql .=           ' OR ' .
                               '(' . $this->_db['tb_lk_col'] . " = '1')";
        }

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {
            // Delete failed during garbage collection/cleanup
            $this->_setErrMsg('GARBAGE_FAIL', $_sql);
            $this->_handleErrors();
        }

        return (bool) $_result;
    }



    /***************************************************************************
     *
     * Start of Public Member Functions
     *
     ***************************************************************************/



    /**
     * getDBResource - Returns the current established MySQL resource link.
     * It can be used in your script to access other tables/databases.
     *
     * @return resource Returns a MySQL resource link identifier.
     * @access public
     */
    function getDBResource()
    {
        return $this->_dbh;
    }


    /**
     * getSessInfo - This will return column information for the session ID
     * passed. The current session ID is used when no session ID is passed.
     * It returns an associative array with the table column names as the key.
     * The session data value, and encryption IV column values are returned
     * only when a confirm password is passed. If the session value is
     * encrypted, it will automatically be decrypted, however the session
     * value data will be raw (in serialized format).
     * The other columns retrieved are useful for determining when a session
     * was created/started and when it will expire.
     * If $_full_exp is FALSE, only the session ID is used to retrieve the row.
     *
     * The trace column can be split into individual values. For example:
     * $fields = $sess->getSessInfo();
     * $arr = explode('~', $fields['sess_trace']); // $arr[1] is IP Address
     *
     * You can use PHP's getdate() function to convert the columns that contain
     * epoch values (such as session created, expiry, and timeout).
     * @link   http://us4.php.net/manual/en/function.getdate.php
     *
     * @param  string $_sess_id The session ID to look for (default is current)
     * @param  bool   $_full_exp Use the full expression in the WHERE clause.
     *                Only used when the session ID is the active one (TRUE def)
     * @param  string $_confirmation_pswd Pass to retrieve raw session value.
     * @return mixed  Returns an assoc. array of data or FALSE on error/no data.
     * @access public
     */
    function getSessInfo($_sess_id = NULL,
                         $_full_exp = TRUE,
                         $_confirmation_pswd = NULL)
    {

        $_sess_id = empty($_sess_id) ? session_id() : $_sess_id;

        /**
         * Verify that raw session value is requested to be retrieved as well
         * by checking the passed password against the confirm password
         * defined in _param['confirm_pswd']
         */
        $_pswd_valid = (0 === strcmp($_confirmation_pswd, $this->_CONF_PSWD)) ?
                        TRUE : FALSE;

        $_sql  = 'SELECT '    . $this->_db['tb_id_col'] .
                         ', ' . $this->_db['tb_sl_col'] .
                         ', ' . $this->_db['tb_cr_col'] .
                         ', ' . $this->_db['tb_ex_col'] .
                         ', ' . $this->_db['tb_to_col'] .
                         ', ' . $this->_db['tb_lk_col'] .
                         ', ' . $this->_db['tb_si_col'] .
                         ', ' . $this->_db['tb_tr_col'];

        if ($_pswd_valid)
            $_sql  .=    ', ' . $this->_db['tb_vl_col'] .
                         ', ' . $this->_db['tb_iv_col'];

        $_sql .= '  FROM '  . $this->_db['tb_name']     .
                 ' WHERE (' . $this->_db['tb_id_col']   . " = '$_sess_id')";

        /**
         * When requested to use full search expressions and the session ID is
         * the same as the current active session ID, use all the rest of the
         * search criteria/fields.
         */
        if (($_full_exp) &&
            (0 === strcmp($_sess_id, session_id()))) {

            $_time      = time();
            $_sec_level = $this->_SEC_LEVEL;
            $_sec_ID    = $this->_getSecID();

            $_sql      .=
                 ' AND (' . $this->_db['tb_sl_col'] . " <= '$_sec_level')" .
                 ' AND (' . $this->_db['tb_ex_col'] . " > '$_time')" .
                 ' AND (' . $this->_db['tb_to_col'] . " > '$_time')" .
                 ' AND (' . $this->_db['tb_lk_col'] . " = '0')" .
                 ' AND (' . $this->_db['tb_si_col'] . " = '$_sec_ID')";

        }

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {

            // Session info. query failed. Could not read session data
            $this->_setErrMsg('INFO_FAIL', $_sql, $_sess_id);
            $this->_handleErrors();

            return FALSE;

        } else {

            $_row = @mysql_fetch_assoc($_result);

            if (!$_row) {
                // Warning: No session data found while doing session info query
                $this->_setWrnMsg('NO_SESS_INFO', $_sql, $_sess_id);
                $this->_handleErrors();

            } else
            if ($_pswd_valid) {

                $_row[$this->_db['tb_vl_col']] =
                    isSet($_row[$this->_db['tb_vl_col']]) ?
                          $_row[$this->_db['tb_vl_col']]  : '';

                $_row[$this->_db['tb_iv_col']] =
                    isSet($_row[$this->_db['tb_iv_col']]) ?
                          $_row[$this->_db['tb_iv_col']]  : '';

                if ($this->_MAGIC_QUOTES_RUNTIME) {
                    $_row[$this->_db['tb_vl_col']] =
                        stripslashes($_row[$this->_db['tb_vl_col']]);

                    $_row[$this->_db['tb_iv_col']] =
                        stripslashes($_row[$this->_db['tb_iv_col']]);
                }

                /**
                 * Decrypt the data if it was encrypted
                 */
                if ((!empty($_row[$this->_db['tb_iv_col']])) &&
                   (!empty($_row[$this->_db['tb_vl_col']]))) {

                    $_row[$this->_db['tb_vl_col']] =
                        $this->sessDecrypt($_row[$this->_db['tb_vl_col']],
                                           $_row[$this->_db['tb_iv_col']],
                                           TRUE);
                }


            }

            if (is_array($_row)) {
                if ($this->_MAGIC_QUOTES_RUNTIME) {
                    $_row[$this->_db['tb_si_col']] =
                        stripslashes($_row[$this->_db['tb_si_col']]);

                    $_row[$this->_db['tb_tr_col']] =
                        stripslashes($_row[$this->_db['tb_tr_col']]);

                }

                return $_row;

            } else {

                return FALSE;

            }

        }
    }


    /**
     * getAllSessInfo - This will return column information for the number of
     * rows indicated (default is to return all rows). You can select the
     * column to sort by (expiry is the default) and whether to sort by
     * ascending or descending (default) sort order. It returns a two
     * dimensional associative array. The first array index is the row number,
     * and the second array index is the table column names.
     * The session data value, and encryption IV column values are returned
     * only when a confirm password is passed. If the session value is
     * encrypted, it will automatically be decrypted, however the session
     * value data will be raw (in serialized format).
     * The other columns retrieved are useful for determining when a session
     * was created/started and when it will expire.
     *
     * The trace column can be split into individual values. For example:
     * $data = $sess->getAllSessInfo();
     * $arr  = explode('~', $data[0]['sess_trace']); // $arr[1] is IP Address
     *
     * You can use PHP's getdate() function to convert the columns that contain
     * epoch values (such as session created, expiry, and timeout).
     * @link   http://us4.php.net/manual/en/function.getdate.php
     *
     * @param  int    $_offset The row number to start returning data from
     * @param  int    $_row_count The number of rows to return (-1 = all rows).
     * @param  string $_order_by The column name to sort rows by (def=expiry).
     * @param  bool   $_ascending Ascending or descending sort order (def=desc)
     * @param  string $_confirmation_pswd Pass to retrieve raw session value.
     * @return mixed  Returns a 2D array of data or FALSE on error/no data.
     * @access public
     */
    function getAllSessInfo($_offset = 0,
                            $_row_count = -1,
                            $_order_by = NULL,
                            $_ascending = FALSE,
                            $_confirmation_pswd = NULL)
    {

        if (!is_int($_offset))
            $_offset = (int) 0;

        if ($_offset < 0)
            $_offset = (int) 0;

        if (!is_int($_row_count))
            $_row_count = (int) -1;

        if (0 == $_row_count)
            $_row_count = (int) -1;

        if (empty($_order_by))
            $_order_by = $this->_db['tb_ex_col'];
        else
            if (($_order_by != $this->_db['tb_id_col']) &&
                ($_order_by != $this->_db['tb_sl_col']) &&
                ($_order_by != $this->_db['tb_cr_col']) &&
                ($_order_by != $this->_db['tb_ex_col']) &&
                ($_order_by != $this->_db['tb_to_col']) &&
                ($_order_by != $this->_db['tb_lk_col']) &&
                ($_order_by != $this->_db['tb_vl_col']) &&
                ($_order_by != $this->_db['tb_iv_col']) &&
                ($_order_by != $this->_db['tb_si_col']) &&
                ($_order_by != $this->_db['tb_tr_col']))
                 $_order_by = $this->_db['tb_ex_col'];

        if (!is_bool($_ascending))
            $_ascending = FALSE;

        $_asc_desc = (TRUE === $_ascending) ? 'ASC' : 'DESC';

        /**
         * Verify that raw session value is requested to be retrieved as well
         * by checking the passed password against the confirm password
         * defined in _param['confirm_pswd']
         */
        $_pswd_valid = (0 === strcmp($_confirmation_pswd, $this->_CONF_PSWD)) ?
                        TRUE : FALSE;

        $_sql  = 'SELECT '    . $this->_db['tb_id_col'] .
                         ', ' . $this->_db['tb_sl_col'] .
                         ', ' . $this->_db['tb_cr_col'] .
                         ', ' . $this->_db['tb_ex_col'] .
                         ', ' . $this->_db['tb_to_col'] .
                         ', ' . $this->_db['tb_lk_col'] .
                         ', ' . $this->_db['tb_si_col'] .
                         ', ' . $this->_db['tb_tr_col'];

        if ($_pswd_valid)
            $_sql  .=    ', ' . $this->_db['tb_vl_col'] .
                         ', ' . $this->_db['tb_iv_col'];

        $_sql .= '  FROM '  . $this->_db['tb_name']     .
                 " ORDER BY $_order_by $_asc_desc LIMIT $_offset,$_row_count";

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {

            // All session information query failed.
            $this->_setErrMsg('ALL_INFO_FAIL', $_sql);
            $this->_handleErrors();

            return FALSE;

        } else {

            $_rows = array();

            while ($_row = @mysql_fetch_assoc($_result)) {


                if ($_pswd_valid) {

                    $_row[$this->_db['tb_vl_col']] =
                        isSet($_row[$this->_db['tb_vl_col']]) ?
                              $_row[$this->_db['tb_vl_col']]  : '';

                    $_row[$this->_db['tb_iv_col']] =
                        isSet($_row[$this->_db['tb_iv_col']]) ?
                            $_row[$this->_db['tb_iv_col']]  : '';

                    if ($this->_MAGIC_QUOTES_RUNTIME) {
                        $_row[$this->_db['tb_vl_col']] =
                            stripslashes($_row[$this->_db['tb_vl_col']]);

                        $_row[$this->_db['tb_iv_col']] =
                            stripslashes($_row[$this->_db['tb_iv_col']]);
                    }

                    /**
                     * Decrypt the data if it was encrypted
                     */
                    if ((!empty($_row[$this->_db['tb_iv_col']])) &&
                        (!empty($_row[$this->_db['tb_vl_col']]))) {

                        $_row[$this->_db['tb_vl_col']] =
                            $this->sessDecrypt($_row[$this->_db['tb_vl_col']],
                                               $_row[$this->_db['tb_iv_col']],
                                               TRUE);
                    }


                }


                if ($this->_MAGIC_QUOTES_RUNTIME) {
                    $_row[$this->_db['tb_si_col']] =
                        stripslashes($_row[$this->_db['tb_si_col']]);

                    $_row[$this->_db['tb_tr_col']] =
                        stripslashes($_row[$this->_db['tb_tr_col']]);

                }

                $_rows[] = $_row;

            }

            if (count($_rows) > 0) {

                @mysql_free_result($_result);
                return $_rows;

            } else {
                // Warning: No session data found while doing all session query
                $this->_setWrnMsg('NO_SESS_INFO2', $_sql);
                $this->_handleErrors();
                return FALSE;

            }


        }
    }


    /**
     * getTableName - Returns the name of the session table.
     *
     * @return string Returns the MySQL table name
     * @access public
     */
    function getTableName()
    {
        return $this->_db['tb_name'];
    }


    /**
     * getSessIDName - Returns the name of the session ID (key) column.
     *
     * @return string Returns the MySQL table column name for session ID
     * @access public
     */
    function getSessIDName()
    {
        return $this->_db['tb_id_col'];
    }


    /**
     * getSecLevelName - Returns the name of the security level column.
     *
     * @return string Returns the MySQL table column name for security level
     * @access public
     */
    function getSecLevelName()
    {
        return $this->_db['tb_sl_col'];
    }


    /**
     * getCreateName - Returns the name of the session created column.
     *
     * @return string Returns the MySQL table column name for created epoch.
     * @access public
     */
    function getCreateName()
    {
        return $this->_db['tb_cr_col'];
    }


    /**
     * getExpiryName - Returns the name of the session expiry column.
     *
     * @return string Returns the MySQL table column name for expiry epoch.
     * @access public
     */
    function getExpiryName()
    {
        return $this->_db['tb_ex_col'];
    }


    /**
     * getTimeoutName - Returns the name of the session timeout column.
     *
     * @return string Returns the MySQL table column name for timeout epoch.
     * @access public
     */
    function getTimeoutName()
    {
        return $this->_db['tb_to_col'];
    }


    /**
     * getLockName - Returns the name of the session locked column.
     *
     * @return string Returns the MySQL table column name for locked boolean.
     * @access public
     */
    function getLockName()
    {
        return $this->_db['tb_lk_col'];
    }


    /**
     * getSessValueName - Returns the name of the session value column.
     *
     * @return string Returns the MySQL table column name for session value.
     * @access public
     */
    function getSessValueName()
    {
        return $this->_db['tb_vl_col'];
    }


    /**
     * getEncIVName - Returns the name of the encryption IV column.
     *
     * @return string Returns the MySQL table column name for encryption IV.
     * @access public
     */
    function getEncIVName()
    {
        return $this->_db['tb_iv_col'];
    }


    /**
     * getSecIDName - Returns the name of the security ID column.
     *
     * @return string Returns the MySQL table column name for security ID.
     * @access public
     */
    function getSecIDName()
    {
        return $this->_db['tb_si_col'];
    }


    /**
     * getTraceName - Returns the name of the session trace column.
     *
     * @return string Returns the MySQL table column name for session trace.
     * @access public
     */
    function getTraceName()
    {
        return $this->_db['tb_tr_col'];
    }


    /**
     * nbrActiveSess - Retrieves the number of active sessions currently in the
     * table.
     *
     * @return int    The number of session rows that are considered active.
     * @access public
     */
    function nbrActiveSess()
    {

        $_time = time();

        $_sql  = 'SELECT '  . $this->_db['tb_lk_col']  .
                 '  FROM '  . $this->_db['tb_name']    .
                 ' WHERE (' . $this->_db['tb_ex_col']  . " > '$_time')" .
                 '   AND (' . $this->_db['tb_to_col']  . " > '$_time')" .
                 '   AND (' . $this->_db['tb_lk_col']  . " = '0')";

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {

            // Active sessions query failed. Could not read session data
            $this->_setErrMsg('ACTIVE_FAIL', $_sql);
            $this->_handleErrors();

            return (bool) FALSE;                // Return an error

        } else {

            return @mysql_num_rows($_result);

        }
    }


    /**
     * nbrInactiveSess - Retrieves the number of inactive sessions currently in
     * the table.
     *
     * @return int     The number of session rows that are considered inactive.
     * @access public
     */
    function nbrInactiveSess()
    {

        $_time = time();

        $_sql  = 'SELECT '  . $this->_db['tb_lk_col']  .
                 '  FROM '  . $this->_db['tb_name']    .
                 ' WHERE (' . $this->_db['tb_ex_col']  . " < '$_time')" .
                 '    OR (' . $this->_db['tb_to_col']  . " < '$_time')" .
                 '    OR (' . $this->_db['tb_lk_col']  . " = '1')";

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {

            // Inactive sessions query failed. Could not read session data
            $this->_setErrMsg('INACTIVE_FAIL', $_sql);
            $this->_handleErrors();

            return (bool) FALSE;                // Return an error

        } else {

            return @mysql_num_rows($_result);

        }
    }


    /**
     * changeSessLock - To lock or unlock a session row in the table.
     * When a session is locked, it will not be further read and is considered
     * temporarily or permanently suspended.
     * Must pass a valid session ID; no default assigned.
     * Note: MySQL will not update columns where the new value is the same as
     * the old value.
     *
     * @param  string  $_sess_id Session ID of the row to change the lock on.
     * @param  bool    $_lock_mode Set to TRUE for lock and FALSE for unlock.
     * @return bool    TRUE on a successful lock/unlock, and FALSE on error or
     *                 empty session string.
     * @access public
     */
    function changeSessLock($_sess_id, $_lock_mode = FALSE)
    {

        if (empty($_sess_id))
            return FALSE;

        if (!is_bool($_lock_mode))
            $_lock_mode = FALSE;

        if (TRUE === $_lock_mode)
            $_lock_mode = 1;
        else
            $_lock_mode = 0;


        $_sql = 'UPDATE ' . $this->_db['tb_name']     .
                  ' SET '                             .
                            $this->_db['tb_lk_col']   .
                            "='$_lock_mode'"          .
                ' WHERE ' . $this->_db['tb_id_col']   .
                            " = '$_sess_id'";


        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {
            // Lock/unlock failed. Could not change session data
            $this->_setErrMsg('A_LOCK_FAIL', $_sql, $_sess_id);
            $this->_handleErrors();
        }

        return (bool) $_result;
    }


    /**
     * changeAllSessLocks - To lock or unlock all session rows in the table.
     * When a session is locked, it will not be further read and is considered
     * temporarily or permanently suspended. Pass the _param['confirm_pswd']
     * to this member function as a way of making sure that it is the intention
     * to lock/unlock all rows in the session table.
     * Note: MySQL will not update columns where the new value is the same as
     * the old value.
     *
     * @param  string  $_confirmation_pswd Password required to change all rows.
     * @param  bool    $_lock_mode Set to TRUE for lock and FALSE for unlock.
     * @return bool    TRUE when rows are successfully locked/unlocked, or FALSE
     *                 on error or invalid password supplied.
     * @access public
     */
    function changeAllSessLocks($_confirmation_pswd = NULL, $_lock_mode = FALSE)
    {

        /**
         * Verify lock/unlock request by checking the passed password against
         * the confirm password defined in _param['confirm_pswd']
         */
        if (0 !== strcmp($_confirmation_pswd, $this->_CONF_PSWD))
            return FALSE;

        if (!is_bool($_lock_mode))
            $_lock_mode = FALSE;

        if (TRUE === $_lock_mode)
            $_lock_mode = 1;
        else
            $_lock_mode = 0;


        $_sql = 'UPDATE ' . $this->_db['tb_name']     .
                  ' SET ' . $this->_db['tb_lk_col']   .
                            "='$_lock_mode'";

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {
            // Lock/unlock failed. Could not change all the session data
            $this->_setErrMsg('ALL_LOCK_FAIL', $_sql);
            $this->_handleErrors();
        }

        return (bool) $_result;
    }


    /**
     * deleteSession - To manually delete an old/expired session row from the
     * table. Must pass a valid session ID; no default assigned.
     *
     * @param  string  $_sess_id Session ID of the row to delete.
     * @return bool    TRUE on a successful delete, and FALSE on error or empty
     *                 session string.
     * @access public
     */
    function deleteSession($_sess_id)
    {

        if (empty($_sess_id))
            return FALSE;

        /**
         * When session ID is the same as the current one, then use
         * session_destroy() to delete a current active session
         * instead of this method.
         */
        if (0 === strcmp($_sess_id, session_id()))
            return session_destroy();

        $_sql = 'DELETE FROM ' . $this->_db['tb_name'] .
                     ' WHERE ' . $this->_db['tb_id_col']  .
                                 " = '$_sess_id'";

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {
            // Delete request failed. Could not delete session data
            $this->_setErrMsg('A_DEL_FAIL', $_sql, $_sess_id);
            $this->_handleErrors();
        }

        return (bool) $_result;
    }


    /**
     * deleteAllSessions - To delete all session rows from table. It's faster
     * to drop and create the table again, however, the current database user
     * should not have such security privileges. Pass the _param['confirm_pswd']
     * to this member function as a way of making sure that it is the intention
     * to delete all rows from the session table.
     *
     * @param  string  $_confirmation_pswd Password required to delete all rows.
     * @return bool    TRUE when rows are successfully deleted, and FALSE on
     *                 error or invalid password supplied.
     * @access public
     */
    function deleteAllSessions($_confirmation_pswd = NULL)
    {

        /**
         * Verify delete request by checking the passed password against
         * the confirm password defined in _param['confirm_pswd']
         */
        if (0 !== strcmp($_confirmation_pswd, $this->_CONF_PSWD))
            return FALSE;

        $_sql = 'DELETE FROM ' . $this->_db['tb_name'];

        $_result = @mysql_query($_sql, $this->_dbh);

        if (!$_result) {
            // Delete all request failed. Could not delete all session data
            $this->_setErrMsg('ALL_DEL_FAIL', $_sql);
            $this->_handleErrors();
        }

        return (bool) $_result;
    }


    /**
     * pregMatches - Returns a boolean of a whole word preg_match result. It
     * checks $_pattern against $_value and returns a boolean result. The
     * preg_match result must match $_value for it to return a TRUE result.
     * It uses a default pattern of '/[a-zA-Z0-9]+/' when no pattern is
     * specified.
     *
     * @param  string $_pattern Set to a valid regular expression pattern.
     * @param  string $_value Set to a value to have the $_pattern check against
     * @return bool Returns TRUE when $_pattern is found in $_value.
     * @access public
     */
    function pregMatches($_pattern, $_value)
    {
        if (empty($_pattern))
            $_pattern = '/[a-zA-Z0-9]+/';  // Match this pattern 1 or more times

        $_matches = array();

        if (preg_match($_pattern, $_value, $_matches) > 0)
            if (0 === @strcmp($_value, $_matches[0]))
                return TRUE;

        return FALSE;

    }


    /**
     * stringSplit - Parses out a string into x number of byte chunk characters.
     * Example: $arr = stringSplit('Hi', 1);
     *
     * $arr then contains: $arr[0] = 'H'  and  $arr[1] = 'i'
     *
     * @param  string $_text Pass a text string you would like to parse out.
     * @param  int    $_chunksize The number of characters to split by.
     * @return array  Returns an array with each index containing x characters.
     * @access public
     */
    function stringSplit($_text, $_chunksize = 1)
    {
        preg_match_all('/(' . str_repeat('.', $_chunksize) . ')/Uims',
                       $_text,
                       $_matches);

        return $_matches[1];
    }


    /**
     * sessEncode - Encrypts plain text. It uses an Initialization Vector (IV)
     * integer in the range of 1-500 in order to produce more varied results.
     * You must use the same IV number when calling the sessDecode member.
     * The encrypted text may be longer than original plain text.
     * This function requires PHP ver >= 4.2.0 because of str_rot13 function.
     *
     *
     * @param  string $_text Pass the plain text you would like to encrypt.
     * @param  int    $_IV Pass a random number between 1 and 500.
     * @return string Returns the plain text passed in encrypted format.
     * @access public
     */
    function sessEncode($_text, $_IV = 3)
    {

        if (is_numeric($_IV)) {

            $_IV = intval($_IV);

            if ($_IV < 1)
                $_IV = 1;
            else
              if ($_IV > 500)
                  $_IV = 42;

        } else {

            $_IV = 3;
        }

        $_text .= ' ';

        $_arr1 = $this->stringSplit($this->_ENCRYPT_KEY);
        $_arr2 = $_arr1;

        foreach ($_arr1 as $_i1 => $_v1) {

            foreach ($_arr2 as $_i2 => $_v2) {

                $_counter = ($_i2 + 1) + ($_i1 * strlen($this->_ENCRYPT_KEY));

                $_array[$_counter] = $_v1 . $_v2;

                if ($_v1 == $_v2)
                    $_array[$_counter] = $_v1 . '_';
            }
        }

        $_encoded = '';
        $_count = 0;
        $_msgarr = $this->stringSplit($_text);

        foreach ($_msgarr as $_mindex => $_mvalue) {

            If ($_mindex / 2 <> ceil ($_mindex / 2)) {

                $_masc = ord($_mvalue) - 31;
                $_masc = $_masc + (ceil($_count * $_IV / 3) + $_IV);
                $_count++;
                if ($_count > 12)
                    $_count = 0;
                $_encoded .= $_array[$_masc];

            } else {

                // No need to get around str_rot13 bug here since $_mvalue is
                // not being referenced after this point & will get overriden.
                $_encoded .= str_rot13($_mvalue);
            }
        }

        return $_encoded;
    }


    /**
     * sessDecode - Decodes text that was previously encrypted with sessEncode.
     * This function requires PHP ver >= 4.2.0 because of str_rot13 function.
     *
     * @param  string $_text Pass the encrypted text created by sessEncode.
     * @param  int    $_IV Pass the same IV number as used in sessEncode.
     * @return string Returns the unencrypted plain text.
     * @access public
     */
    function sessDecode($_text, $_IV = 3)
    {

        $_count = 0;

        if (is_numeric($_IV)) {

            $_IV = intval($_IV);

            if ($_IV < 1)
                $_IV = 1;
            else
              if ($_IV > 500)
                  $_IV = 42;

        } else {

            $_IV = 3;
        }

        $_arr1 = $this->stringSplit($this->_ENCRYPT_KEY);
        $_arr2 = $_arr1;

        foreach ($_arr1 as $_i1 => $_v1) {

            foreach ($_arr2 as $_i2 => $_v2) {

                $_counter = ($_i2 + 1) + ($_i1 * strlen($this->_ENCRYPT_KEY));
                $_array[$_counter] = $_v1 . $_v2;
                if ($_v1 == $_v2)
                    $_array[$_counter] = $_v1 . '_';
            }
        }

        $_array = array_flip($_array);
        $_msgarr = $this->stringSplit($_text, 3);

        $_decoded = '';            // Rev 1.0.2: Added this initialization line

        foreach ($_msgarr as $_mvalue) {

            // $_tmp_hold used to get around a possible PHP bug in versions
            // earlier than 4.3.0. The variable passed in function might change.
            $_tmp_hold  = $_mvalue;
            $_decoded  .= str_rot13($_tmp_hold{0});

            $_ivalue = $_array[substr($_mvalue, 1, 2)];
            $_ivalue = $_ivalue - (ceil($_count * $_IV / 3) + $_IV);
            $_count++;
            if ($_count > 12)
                $_count = 0;

            $_masc = chr($_ivalue + 31);
            $_decoded .= $_masc;
        }

        return trim($_decoded);    // Rev 1.0.1: Added trim(). Removed substr().
    }


    /**
     * sessEncrypt - Encrypts plain text. It uses an Initialization Vector (IV).
     * The same IV is needed for the decryption phase. Must save IV for
     * later decryption. This routine will attempt to use the mcrypt
     * algorithms if installed first, otherwise the sessEncode member is used.
     * The encrypted text may be longer than original plain text. When you have
     * a few/many fields to encrypt in one script cycle, choose to keep the
     * mcrypt module open to speed up encryption (only for libmcrypt >= 2.4.x).
     *
     * @link   http://mcrypt.hellug.gr
     * @param  string $_text Pass the plain text you would like to encrypt.
     * @param  string $IV Pass by reference var. This will get assigned the IV.
     * @param  bool   $_keep_open TRUE to keep mcrypt module open, FALSE close.
     * @return mixed  Returns an encrypted value representing the original
     *                text, or FALSE on error.
     * @access public
     */
    function sessEncrypt($_text, &$IV, $_keep_open = FALSE)
    {

        static $_open_already = FALSE;  // Open encrypt flag For ver >= 2.4.x
        static $_module       = NULL;


        if (!is_bool($_keep_open))
            $_keep_open = FALSE;

        if (($this->_MCRYPT) &&
            (!empty($this->_ENC_ALGO)) &&
            (!empty($this->_ENC_MODE))) {

            if ($this->_MCRYPT_LATEST) {    // For >= 2.4.x

                if (!$_open_already) {

                    $_module = @mcrypt_module_open($this->_ENC_ALGO, '',
                                                   $this->_ENC_MODE, '');

                    if (FALSE === $_module) {

                        // Could not open encryption module for encrypting
                        $this->_setErrMsg('ENC_OPEN_FAIL', NULL,
                                          $this->_ENC_ALGO, $this->_ENC_MODE);
                        $this->_handleErrors();

                        return FALSE;

                    }

                    $_open_already = TRUE;

                }

                $IV = @mcrypt_create_iv (@mcrypt_enc_get_iv_size($_module),
                                         MCRYPT_RAND);   // For Windows support

                $_key = substr($this->_ENC_KEY_HASHED, 0,
                               @mcrypt_enc_get_key_size($_module));

                $_result = mcrypt_generic_init($_module, $_key, $IV);

                if ($_result < 0) {

                    switch ($_result) {

                        case -3:

                            // Key length for encryption is incorrect
                            $this->_setErrMsg('ENC_KEY_LEN', NULL,
                                              $this->_ENC_ALGO,
                                              $this->_ENC_MODE,
                                              strlen($_key));

                        case -4:

                            // There were memory allocation problems - encrypt
                            $this->_setErrMsg('ENC_MEMORY', NULL,
                                              $this->_ENC_ALGO,
                                              $this->_ENC_MODE);

                        default:

                            // There were unknown errors while trying to encrypt
                            $this->_setErrMsg('ENC_UNKNOWN', NULL,
                                              $this->_ENC_ALGO,
                                              $this->_ENC_MODE);

                    }

                    $this->_handleErrors();

                    return FALSE;
                }

                $_enc = @mcrypt_generic($_module, $_text);


                if (!$_keep_open) {

                    @mcrypt_generic_deinit($_module);
                    @mcrypt_module_close($_module);

                    $_open_already = FALSE;
                    $_module = NULL;
                }


            } else {    // For 2.2.x

                $IV   = @mcrypt_create_iv(
                                          @mcrypt_get_block_size(
                                                                $this->_ENC_ALGO
// FYI: Would be needed to run in > 2.2.x                     , $this->_ENC_MODE
                                                                ),
                                          MCRYPT_RAND
                                         ); // MCRYPT_RAND for Windows support

                $_key = substr($this->_ENC_KEY_HASHED, 0,
                               @mcrypt_get_key_size($this->_ENC_ALGO
// FYI: Would be needed to run in > 2.2.x         , $this->_ENC_MODE
                                                   )
                              );

                switch ($this->_ENC_MODE) {

                     case MCRYPT_MODE_ECB:

                     $_enc = @mcrypt_ecb(
                                         $this->_ENC_ALGO,
                                         $_key,
                                         $_text,
                                         MCRYPT_ENCRYPT
// FYI: Would be needed to run in > 2.2.x , $IV
                                        );

                     $IV   = '';        // FYI: Would comment to run in > 2.2.x
                     break;

                     case MCRYPT_MODE_CFB:

                     $_enc = @mcrypt_cfb(
                                         $this->_ENC_ALGO,
                                         $_key,
                                         $_text,
                                         MCRYPT_ENCRYPT,
                                         $IV
                                        );
                     break;

                     case MCRYPT_MODE_OFB:

                     $_enc = @mcrypt_ofb(
                                         $this->_ENC_ALGO,
                                         $_key,
                                         $_text,
                                         MCRYPT_ENCRYPT,
                                         $IV
                                        );
                     break;

                     default:

                     $_enc = @mcrypt_cbc(
                                         $this->_ENC_ALGO,
                                         $_key,
                                         $_text,
                                         MCRYPT_ENCRYPT,
                                         $IV
                                        );
                }

            }

            $_enc = trim(@base64_encode($_enc));
            $IV   = trim(@base64_encode($IV));

        } else {

            $IV   = (int) mt_rand(1, 500);

            $_enc = $this->sessEncode($_text, $IV);

        }

        return $_enc;

    }


    /**
     * sessDecrypt - Decrypts encrypted text created by the sessEncrypt member.
     * It needs to be passed the same Initialization Vector (IV) used in the
     * encryption process. When you have a few/many fields to decrypt in one
     * script cycle, choose to keep the mcrypt module open to speed up
     * decryption (only for libmcrypt >= 2.4.x). A correctly decrypted field
     * will be returned as a string, so if you're expecting/wanting an integer
     * then you have to type cast or use intval() function.
     *
     * @param  string $_enc Pass the encrypted text you would like to decrypt.
     * @param  string $_IV Pass the same IV used in the encryption phase.
     * @param  bool   $_keep_open TRUE to keep mcrypt module open, FALSE close.
     * @return mixed  Returns the original plain text or FALSE on error.
     * @access public
     */
    function sessDecrypt($_enc, $_IV, $_keep_open = FALSE)
    {

        static $_open_already = FALSE;  // Open encrypt flag For ver >= 2.4.x
        static $_module       = NULL;


        if (!is_bool($_keep_open))
            $_keep_open = FALSE;


        if ((is_numeric($_IV))  &&
            (strlen($_IV) > 0)  &&
            (strlen($_IV) < 4)  &&
            (intval($_IV) > 0)  &&
            (intval($_IV) < 501)) {

            $_text = $this->sessDecode($_enc, intval($_IV));

        } else
        if (($this->_MCRYPT) &&
            (!empty($this->_ENC_ALGO)) &&
            (!empty($this->_ENC_MODE))) {

            $_IV   = @base64_decode($_IV);
            $_enc  = @base64_decode($_enc);

            if ($this->_MCRYPT_LATEST) {    // For >= 2.4.x

                if (!$_open_already) {

                    $_module = @mcrypt_module_open($this->_ENC_ALGO, '',
                                                   $this->_ENC_MODE, '');

                    if (FALSE === $_module) {

                        // Could not open encryption module for decryption
                        $this->_setErrMsg('DEC_OPEN_FAIL', NULL,
                                          $this->_ENC_ALGO, $this->_ENC_MODE);
                        $this->_handleErrors();

                        return FALSE;

                    }

                    $_open_already = TRUE;
                }

                $_key = substr($this->_ENC_KEY_HASHED, 0,
                               @mcrypt_enc_get_key_size($_module));

                $_result = @mcrypt_generic_init($_module, $_key, $_IV);

                if ($_result < 0) {

                    switch ($_result) {

                        case -3:

                            // Key length for decryption is incorrect
                            $this->_setErrMsg('DEC_KEY_LEN', NULL,
                                              $this->_ENC_ALGO,
                                              $this->_ENC_MODE,
                                              strlen($_key));

                        case -4:

                            // There were memory allocation problems - decrypt
                            $this->_setErrMsg('DEC_MEMORY', NULL,
                                              $this->_ENC_ALGO,
                                              $this->_ENC_MODE);

                        default:

                            // There were unknown errors while trying to decrypt
                            $this->_setErrMsg('DEC_UNKNOWN', NULL,
                                              $this->_ENC_ALGO,
                                              $this->_ENC_MODE);

                    }

                    $this->_handleErrors();

                    return FALSE;
                }

                // trim is especially needed in Cipher Block Chaining (CBC) mode
                $_text = trim(@mdecrypt_generic($_module, $_enc));

                if (!$_keep_open) {

                    @mcrypt_generic_deinit($_module);
                    @mcrypt_module_close($_module);

                    $_open_already = FALSE;
                    $_module = NULL;
                }

            } else {            // For 2.2.x


                $_key = substr($this->_ENC_KEY_HASHED, 0,
                               @mcrypt_get_key_size($this->_ENC_ALGO
// FYI: Would be needed to run in > 2.2.x          ,$this->_ENC_MODE
                                                   )
                              );

                switch ($this->_ENC_MODE) {

                     case MCRYPT_MODE_ECB:

                     $_text = @mcrypt_ecb(
                                          $this->_ENC_ALGO,
                                          $_key,
                                          $_enc,
                                          MCRYPT_DECRYPT
// FYI: Would be needed to run in > 2.2.x ,$_IV
                                         );

                     break;

                     case MCRYPT_MODE_CFB:

                     $_text = @mcrypt_cfb(
                                          $this->_ENC_ALGO,
                                          $_key,
                                          $_enc,
                                          MCRYPT_DECRYPT,
                                          $_IV
                                         );
                     break;

                     case MCRYPT_MODE_OFB:

                     $_text = @mcrypt_ofb(
                                          $this->_ENC_ALGO,
                                          $_key,
                                          $_enc,
                                          MCRYPT_DECRYPT,
                                          $_IV
                                         );
                     break;

                     default:

                     $_text = @mcrypt_cbc(
                                          $this->_ENC_ALGO,
                                          $_key,
                                          $_enc,
                                          MCRYPT_DECRYPT,
                                          $_IV
                                         );
                }

                $_text = trim($_text); // Especially needed for CBC mode

            }

        } else {

            $_text = FALSE;

        }

        return $_text;
    }


    /**
     * sendCacheHeader - Transmits the value for the Cache-Control header
     * option(s).
     *
     * @uses   Example to stop caching: 'no-store, no-cache, must-revalidate,
     *                                   post-check=0, pre-check=0'
     *
     * @param  string $_options Cache-Control header option(s)
     * @return bool   Always returns TRUE.
     * @access public
     */
    function sendCacheHeader($_options = 'private')
    {

        header("Cache-Control: $_options");

        return TRUE;
    }


    /**
     * getMySQLVer - Call to obtain the version number of the MySQL server.
     *
     * @return string Returns the current MySQL server version number.
     * @access public
     */
    function getMySQLVer()
    {
        return $this->_mysql_ver;
    }


    /**
     * getSessName - Call to obtain the current PHP Session name (used in URL's)
     *
     * @return string Returns the current PHP Session name.
     * @access public
     */
    function getSessName()
    {
        return $this->_sess_name;
    }


    /**
     * getSessLife - Retrieves the current PHP Session life duration. Set
     * $_in_minutes to TRUE to return a value in minutes (rounded up to
     * the next whole minute).
     *
     * @param  bool   $_in_minutes A switch to signify that the return value
     *                should be in minutes instead of seconds (the default).
     * @return int    Returns the number of seconds or minutes of session life.
     * @access public
     */
    function getSessLife($_in_minutes = FALSE)
    {
        if ($_in_minutes)
            return intval(ceil($this->_SESS_LIFE / 60));
        else
            return (int) $this->_SESS_LIFE;
    }


    /**
     * getSessTimeout - Returns what the session timeout duration is set to. Set
     * $_in_minutes to TRUE to return a value in minutes (rounded up to
     * the next whole minute).
     *
     * @param  bool   $_in_minutes A switch to signify that the return value
     *                should be in minutes instead of seconds (the default).
     * @return int    Returns the number of seconds/minutes of session timeout.
     * @access public
     */
    function getSessTimeout($_in_minutes = FALSE)
    {
        if ($_in_minutes)
            return intval(ceil($this->_SESS_TIMEOUT / 60));
        else
            return (int) $this->_SESS_TIMEOUT;
    }


    /**
     * setSessVar - Creates or updates a session variable's value. You can
     * select to have the session variables contents be encrypted. For extra
     * security, you can select for an extra/duplicate field to be created which
     * will contain the encrypted value (while leaving the non-encrypted value
     * in the session field specified untouched). By using this option,
     * getSessVar() will automatically make a comparison of the two values for
     * extra validity. For the encryption option, the value can't be an array,
     * a boolean, a resource, or an object.
     *
     * @param  string $_field Name to assign as key index in $_SESSION array.
     * @param  mixed  $_value to assign the field name/key in $_SESSION array.
     * @param  bool   $_encrypt_value Set TRUE to have encryption performed.
     * @param  bool   $_extra_field Set TRUE to create a new encrypted field.
     * @param  string $_ENC_SFX Encrypted field suffix value added to create
     *                the new encrypted field.
     * @param  string $_ENC_IV_SFX The IV field suffix value added to create
     *                the IV field. Always created with encryption option.
     * @param  bool   $_ERROR Set to what value should be returned upon error.
     * @return bool   Returns TRUE when field value is set, FALSE on NULL/error.
     * @access public
     */
    function setSessVar($_field,
                        $_value         = NULL,
                        $_encrypt_value = FALSE,
                        $_extra_field   = FALSE,
                        $_ENC_SFX       = '_enc',
                        $_ENC_IV_SFX    = '_enc_iv',
                        $_ERROR         = FALSE
                       )

    {

        if (empty($_field))
            return $_ERROR;

        if (!is_bool($_encrypt_value))
            $_encrypt_value = FALSE;

        /**
         * When encryption requested, see if we can encrypt this type of value.
         */
        if (($_encrypt_value)       &&
            (!is_array($_value))    &&
            (!is_bool($_value))     &&
            (!is_resource($_value)) &&
            (!is_object($_value)))  {

            $_enc_iv = 0;

            $_enc = $this->sessEncrypt($_value, $_enc_iv, TRUE);

            if (FALSE === $_enc)
                return $_ERROR;               // Encryption didn't work

            if (!$this->pregMatches('/[a-zA-Z0-9_]+/', $_ENC_IV_SFX))
                $_ENC_IV_SFX = '_enc_iv';

            /**
             * Save encrypted info.
             */
            $_SESSION[$_field . $_ENC_IV_SFX] = $_enc_iv;

            if (!is_bool($_extra_field))
                $_extra_field = FALSE;

            if ($_extra_field) {

                if (!$this->pregMatches('/[a-zA-Z0-9_]+/', $_ENC_SFX))
                    $_ENC_SFX = '_enc';

                /**
                 * Place encrypted value in a new field, and leave non-encrypted
                 * value in selected/same field.
                 */
                $_SESSION[$_field . $_ENC_SFX] = $_enc;
                $_SESSION[$_field] = $_value;

            } else {

                /**
                 * No extra field wanted, so place encrypted value in
                 * selected/same field.
                 */
                $_SESSION[$_field] = $_enc;
            }


        } else {    // Encryption not requested or not right type

            $_SESSION[$_field] = $_value;
        }

        return isSet($_SESSION[$_field]);
    }


    /**
     * getSessVar - Returns a session variables value if assigned (and not NULL)
     * or the default value supplied, or NULL when no default supplied. Also,
     * this will detect if a value had been encrypted and will automatically
     * return the decrypted value. When the extra field option is used in
     * setSessVar(), then a comparison of original and extra field values are
     * automatically performed to make sure that the original fields value has
     * not been modified by an outside source (hacker).
     * FYI: The $_SESSION array is only made available after a session_start().
     *
     * @param  string $_field Key name to look for in $_SESSION superglobal
     *                array.
     * @param  mixed  $_default A value to return when var is not set/NULL.
     * @param  string $_ENC_SFX Encrypted field suffix value used when
     *                encryption field was created (in setSessVar).
     * @param  string $_ENC_IV_SFX The IV field suffix value used when the IV
     *                field was created (in setSessVar).
     * @param  bool   $_ERROR Set to what value should be returned upon error.
     * @return mixed  Returns session variable value, assigned default, or
     *                FALSE on error.
     * @access public
     */
    function getSessVar($_field,
                        $_default    = NULL,
                        $_ENC_SFX    = '_enc',
                        $_ENC_IV_SFX = '_enc_iv',
                        $_ERROR      = FALSE
                       )
    {

        if (empty($_field))
            return $_ERROR;

        /**
         * Determine if field has already been defined
         */
        if (isSet($_SESSION[$_field])) {

            if (!$this->pregMatches('/[a-zA-Z0-9_]+/', $_ENC_IV_SFX))
                $_ENC_IV_SFX = '_enc_iv';

            /**
             * When this field is defined we have an encrypted value
             */
            $_enc_iv = (isSet($_SESSION[$_field . $_ENC_IV_SFX])) ?
                              $_SESSION[$_field . $_ENC_IV_SFX]   : NULL;

            /**
             * It's not encrypted when there's no IV value defined
             */
            if (is_null($_enc_iv)) {

                return $_SESSION[$_field];      // Return non-encrypted value

            }

            if (!$this->pregMatches('/[a-zA-Z0-9_]+/', $_ENC_SFX))
                $_ENC_SFX = '_enc';

            /**
             * We now know that we have an encrypted value. Find out if the
             * original or the extra field contains the encrypted value.
             */
            $_enc = (isSet($_SESSION[$_field . $_ENC_SFX])) ?
                           $_SESSION[$_field . $_ENC_SFX]   :
                           $_SESSION[$_field];

            $_text = $this->sessDecrypt($_enc, $_enc_iv, TRUE);

            if (FALSE === $_text)
                return $_ERROR;                   // Error with decryption

           /**
             * If the extra field contained the encrypted value, then compare
             * the original fields value with the decrypted value. They should
             * both match if security hasn't been compromised.
             */
            if (isSet($_SESSION[$_field . $_ENC_SFX])) {

                if ($_SESSION[$_field] != $_text)
                    return $_ERROR;               // Field integrity compromised

            }

            return $_text;                        // Return decrypted value


        } else {

            return $_default;      // Field not defined, so return the default
        }

    }


    /**
     * stopOnWarnings - Set to stop script when warning messages are generated.
     *
     * @return bool  Returns TRUE meaning any warnings will stop the script.
     * @access public
     */
    function stopOnWarnings()
    {
        return $this->_stop_on_warn = TRUE;
    }


    /**
     * endStopOnWarnings - Set to keep script running when warning messages are
     * generated.
     *
     * @return bool  Returns FALSE meaning script will not stop on warnings.
     * @access public
     */
    function endStopOnWarnings()
    {
        return $this->_stop_on_warn = FALSE;
    }


    /**
     * warningsExist - A check to see if warning messages have been generated.
     *
     * @return bool  Returns TRUE if there are warning messages, otherwise FALSE
     * @access public
     */
    function warningsExist()
    {
        return (empty($this->_warnings)) ? FALSE : TRUE;
    }


    /**
     * flushWarnings - Clears all warning messages that may have been generated.
     *
     * @return string  Always returns NULL.
     * @access public
     */
    function flushWarnings()
    {
        return $this->_warnings = NULL;
    }


    /**
     * getWarnings - Retrieves and formats all warning messages for displaying.
     * Clears the warnings once called.
     *
     * @param  string $_color Font color to return warning in (HTML syntax).
     * @param  string $_size  Font size to return warning in (HTML syntax).
     * @return string Warning messages with HTML breaks/entities added.
     * @access public
     */
    function getWarnings($_color = 'BLUE', $_size = '+0')
    {
        if (empty($_color))
            $_color = 'BLUE';

        if (empty($_size))
            $_size  = '+0';

        $_warnMsgs = nl2br(htmlentities($this->_warnings, ENT_QUOTES));
        $_warnMsgs = $this->_formatFont($_warnMsgs, $_color, $_size);
        $this->flushWarnings();
        return $_warnMsgs;
    }


    /**
     * stopOnErrors - Set to stop script when error messages are generated.
     *
     * @return bool  Returns TRUE meaning any errors will stop the script.
     * @access public
     */
    function stopOnErrors()
    {
        return $this->_stop_on_error = TRUE;
    }


    /**
     * endStopOnErrors - Set to keep script running when error messages are
     * generated.
     *
     * @return bool  Returns FALSE meaning script will not stop on errors.
     * @access public
     */
    function endStopOnErrors()
    {
        return $this->_stop_on_error = FALSE;
    }


    /**
     * errorsExist - A check to see if error messages have been generated.
     *
     * @return bool  Returns TRUE if there are error messages, otherwise FALSE.
     * @access public
     */
    function errorsExist()
    {
        return (empty($this->_errors)) ? FALSE : TRUE;
    }


    /**
     * flushErrors - Clears all error messages that may have been generated.
     *
     * @return string  Always returns NULL.
     * @access public
     */
    function flushErrors()
    {
        return $this->_errors = NULL;
    }


    /**
     * getErrors - Retrieves and formats all error messages for displaying.
     * Clears the errors once called.
     *
     * @param  string $_color Font color to return error in (HTML syntax).
     * @param  string $_size  Font size to return error in (HTML syntax).
     * @return string Severe error messages with HTML breaks/entities added.
     * @access public
     */
    function getErrors($_color = 'RED', $_size = '+0')
    {
        if (empty($_color))
            $_color = 'RED';

        if (empty($_size))
            $_size  = '+0';

        $_errMsgs = nl2br(htmlentities($this->_errors, ENT_QUOTES));
        $_errMsgs = $this->_formatFont($_errMsgs, $_color, $_size);
        $this->flushErrors();
        return $_errMsgs;
    }


    /**
     * setSessURI - Appends the PHP session name and ID to the end of a URI.
     * It checks whether a question mark already is in the URI.
     * Useful for creating a URI to be used in a redirect (but less secure).
     *
     * @param  string $_uri A URI i.e. http://www.example.com/index.php
     * @return string The URI only, or URI with the session name and ID appended
     * @access public
     */
    function setSessURI($_uri)
    {

     	if (!empty($_uri)) {

            $_sess_id = session_id();

            if (!empty($_sess_id)) {   // instead of using SID
                if (FALSE === strstr($_uri, '?'))
                    $_uri .= '?' . $this->_sess_name . '=' . $_sess_id;
                else
                    $_uri .= $this->_ARG_SEP . $this->_sess_name . '=' .
                             $_sess_id;
            }

     	}

   	    return $_uri;
    }


    /**
     * createLink - Creates a link and appends the PHP session name and ID when
     * requested by setting $_add_sess to TRUE, which is the default.
     *
     * @param  string $_uri The URI for the link. i.e. http://www.example.com
     * @param  string $_desc The text description for the link. URI used if none
     * @param  string $_target Where to display upon click. i.e. _blank
     * @param  bool   $_add_sess When TRUE it adds session name and ID to link.
     * @return string HTML link or empty string.
     * @access public
     */
    function createLink($_uri,
                        $_desc     = NULL,
                        $_target   = NULL,
                        $_add_sess = TRUE
                       )
    {

     	if (empty($_uri))
  	        return '';

        if (!is_bool($_add_sess))
            $_add_sess = TRUE;

        $_desc = empty($_desc) ? $_uri : $_desc;

        if ($_add_sess)
            $_uri = $this->setSessURI($_uri);

     	if (empty($_target))
     	    return sprintf("<a href=\"%s\">%s</a>", $_uri, $_desc);
        else
     	    return sprintf("<a href=\"%s\" target=\"%s\">%s</a>",
     	                   $_uri,
     	                   $_target,
     	                   $_desc);

    }


    /**
     * getIPAddr - Detects and retrieves the IP address. If the value is
     * obtained from HTTP_X_FORWARDED_FOR, it could have multiple IP addresses.
     *
     * @param  string $type_used Passed by reference; used to return back a code
     * @return string Returns the IP address.
     * @return string Returns by reference a code used to signify the field type
     *                used to determine IP. Either: C, F, R, or U
     * @access public
     */
    function getIPAddr(&$type_used)
    {
        if (isSet($_SERVER['HTTP_CLIENT_IP'])) {
            $_ip = $_SERVER['HTTP_CLIENT_IP'];
            $type_used = 'C';

        } else
            if (isSet($_SERVER['HTTP_X_FORWARDED_FOR'])) {

                $_ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
                $type_used = 'F';

       } else
            if (isSet($_SERVER['REMOTE_ADDR'])) {

                $_ip = $_SERVER['REMOTE_ADDR'];
                $type_used = 'R';

        } else {

                $_ip = 'UNKNOWN';
                $type_used = 'U';

        }

        return $_ip;
    }


    /**
     * secureConnection - Determines whether current connection is secure (SSL).
     *
     * @return bool Returns TRUE when this web connection is using SSL (HTTPS).
     * @access public
     */
    function secureConnection()
    {

        if (isSet($_SERVER['HTTPS']))
            return (0 === strcmp($_SERVER['HTTPS'], 'on')) ? TRUE : FALSE;
        else
            return FALSE;

    }


   /**
     * getVersion - Indicates the version number of this DB_eSession class.
     *
     * @return string Returns the current version number of this script.
     * @access public
     */
    function getVersion()
    {
        return $this->_ver;
    }


    /**
     * getSiteWarn - Formats a site warning message for displaying on your site.
     * When $_add_link is TRUE and warning message contains 'DB_eSession', it
     * will convert that text to a link to the author's web site.
     *
     * @param  string $_color Font color to return message in (HTML syntax).
     * @param  string $_size  Font size to return message in (HTML syntax).
     * @param  bool   $_center TRUE-centers message (adds <center></center>).
     * @param  bool   $_add_link When TRUE it creates a link to authors site.
     * @return string Returns the site warning message.
     * @access public
     */
    function getSiteWarn($_color = "NAVY", $_size = '-2', $_center = FALSE,
                         $_add_link = TRUE)
    {
        $_tmp_hold = $this->_warnings;
        $this->flushWarnings();
        $this->_setWrnMsg('SITE_WARN');
        $_msg = $this->_warnings;
        $this->_warnings = $_tmp_hold;

        $_msg = nl2br(htmlentities($_msg, ENT_QUOTES));

        if (empty($_color))
            $_color = 'NAVY';

        if (empty($_size))
            $_size  = '-2';

        if (!is_bool($_center))
            $_center = FALSE;

        if (!is_bool($_add_link))
            $_add_link = TRUE;

        if ($_add_link) {
            $_msg = str_replace('DB_eSession',
                           $this->createLink('http://www.code.dearneighbor.com',
                                             'DB_eSession', '_blank', FALSE),
                                $_msg);
        }

        $_msg = $this->_formatFont($_msg, $_color, $_size);

        if ($_center)
            $_msg = "<CENTER>{$_msg}</CENTER>";

        return $_msg;
    }


}   // End of DB_eSession class

// Make sure there are no whitespaces after the '>' character on the last line.
?>

You can gain more secure and stable PHP sessions by using a database, and utilizing this class in your PHP scripts.

This custom PHP/MySQL database session handler class might just be what you're looking to implement on your web or intranet site.

The DB_eSession class has the following list of features:

General features:

* Stores session data in a MySQL table using PHP's built-in session handler.
* Built-in handling of session expiration and cleanup.
* Supports the changes of session related configuration settings (inc. PHP5).
* Allows for normal or persistent MySQL database connections.
* Access to opened MySQL resource connection to use in your script.
* Accepts a passed database resource link to use as the DB connection.
* Supports session ID's between 12 and 32 characters long.
* Custom or changeable database, table and column names.
* An option to create new session ID's (you supply, class or PHP builds).
* Can initiate buffered output (using ob_start) within the class.
* A session_start() automatically initiated within the class.
* Can send 'Cache-Control:' header output within the class (fixes IE6 bug).
* Ability to retrieve a specific sessions expiration date and time.
* Retrieve current session life setting in seconds or minutes.
* Retrieve a numeric total of the number of active and inactive sessions in table.
* Facility to make assignment and retrieval of session variables easier.
* Ability to create manual URI's and links that includes session name and ID.
* The ability to retrieve what the MySQL server version number is.
* An adequate form of encryption/decryption member functions are included and used automatically when libmcrypt is not installed.

Security features:

* Standard user inactivity time-out handled automatically.
* Absolute user logoff time-out capability (session will be terminated no matter what after a number of designated minutes/seconds have elapsed).
* Ability to lock and unlock a particular session or all sessions. When a session is locked, it is immediately not available for use.
* User to session verification using IP address and browser information.
* Security level (code) clearance for each session/web page.
* Encrypt/decrypt as desired each session field.
* Encrypt/decrypt an extra session field to compare against original (to detect against possible tampering).
* Encrypt/decrypt the whole session data in the table (essentially obscuring session variable names in table). Can be used in combination with per session field encryption, resulting in double encryption security.
* A new encryption Initialization Vector is created every time values change.
* Ability to manually delete a particular session or all sessions.
* The users IP address and web browser is recorded as part of the session for tracing information.

Other features:

* Support for multiple language error and warning messages.
* Support of a default language as well as current active language settings.
* Basic or detailed (with SQL syntax) error/warning reporting.
* Buffered error and warning messages.
* Option for class to stop execution or not upon encountering an error/warning. Class can display errors/warnings automatically or control in your script.
* Can select font color and size separately for error and warning messages.
* Code has lots of comments and formatted within 82 characters wide.
* Full documentation (only provided in English) is included.
* Code use examples provided, including a basic authentication (login/logout) process.
* SQL text file provided for creating the MySQL session table.

System Requirements:

PHP version 4.2.0 or higher, MySQL version 3.22.5 or higher, web server (Apache, IIs), and Unix/Linux/Windows. An ability to create MySQL databases, usernames and passwords such as with phpMyAdmin. libmcrypt 2.2.x or higher is optional if you want to utilize encryption/decryption. The PHP register_globals configuration option can be on or off. Session.auto_start must be off. Magic_quotes_gpc and runtime options are handled.

1 comment

Chris Grafix 15 years, 7 months ago  # | flag

Lawrence Orisis DB_eSession class security vulnerabilities. Hi,

The DB_eSession class by Lawrence Orisis has a SQL injection vulnerabiltiy that can be fixed.

Add this line of code on line 1092 in the class DB_eSession

//******************

//* This line has been added to prevent sql injections *

//******************

$_sess_id_set = ( empty($_sess_id_set) ) ? NULL: mysql_real_escape_string($_sess_id_set);

Sincerely,

Chris Grafix

http://www.VRtechDomains.com - this site is using this class

http://www.Panospheric.com

Created by Lawrence O on Sun, 28 Nov 2004 (MIT)
PHP recipes (51)
Lawrence O's recipes (1)

Required Modules

  • (none specified)

Other Information and Tasks