Php中session_set_save_handler的含义
今天看手册，无意中看到了session_set_save_handler不解其意，于是上网搜寻得知，可以使用session_set_save_handler函数重载SESSION存储方式存储于MYSQL，样例如下：Code
1<?php
2 $DB_SERVER = "server"; /* database server hostname */
3 $DB_NAME = "dbname"; /* database name */
4 $DB_USER = "root"; /* database user */
5 $DB_PASS = "*************"; /* database password */
6
7 $DB_SELECT_DB = "";
8 $SESS_LIFE = get_cfg_var("session.gc_maxlifetime");
9
10function sess_open($save_path, $session_name) {
11global $DB_SERVER, $DB_NAME, $DB_USER, $DB_PASS, $DB_SELECT_DB;
12
13if (! $DB_SELECT_DB = mysql_pconnect($DB_SERVER, $DB_USER, $DB_PASS)) {
14echo "SORRY! MYSQL ERROR : Can't connect to $DB_SERVER as $DB_USER";
15echo "MySQL Error: ", mysql_error();
16die;
17}
18
19if (! mysql_select_db($DB_NAME, $DB_SELECT_DB)) {
20echo "SORRY! MYSQL ERROR : Unable to select database $DB_NAME";
21die;
22}
23
24return true;
25}
26
27function sess_close() {
28return true;
29}
30
31function sess_read($SessionKey){
32 global $DB_SELECT_DB, $SESS_LIFE;
33 $Query = "SELECT SessionArray FROM cdb_global_sessions WHERE SessionKey = '".$SessionKey."' AND SessionExpTime > " . time();
34 $Result = mysql_query($Query, $DB_SELECT_DB);
35
36if (list($SessionArray) = mysql_fetch_row($Result)) {
37return $SessionArray;
38}
39
40return false;
41}
42
43function sess_write($SessionKey, $VArray) {
44global $DB_SELECT_DB, $SESS_LIFE;
45
46$SessionExpTime = time() + $SESS_LIFE;
47$SessionArray = addslashes($VArray);
48
49$Query = "INSERT INTO cdb_global_sessions (SessionKey,SessionExpTime,SessionArray) VALUES ('".$SessionKey."','".$SessionExpTime."','".$SessionArray."')";
50$Result = mysql_query($Query, $DB_SELECT_DB);
51
52if (!$Result){
53$Query = "UPDATE cdb_global_sessions SET SessionExpTime = '".$SessionExpTime."', SessionArray = '".$SessionArray."' WHERE SessionKey = '".$SessionKey."' AND SessionExpTime > " . time();
54$Result = mysql_query($Query, $DB_SELECT_DB);
55}
56return $Result;
57}
58
59function sess_destroy($SessionKey) {
60global $DB_SELECT_DB;
61
62$Query = "DELETE FROM cdb_global_sessions WHERE SessionKey = '".$SessionKey."'";
63$Result = mysql_query($Query, $DB_SELECT_DB);
64
65return $Result;
66}
67
68function sess_gc($maxlifetime) {
69global $DB_SELECT_DB;
70
71$Query = "DELETE FROM cdb_global_sessions WHERE SessionExpTime < " . time();
72$Result = mysql_query($Query, $DB_SELECT_DB);
73
74return mysql_affected_rows($DB_SELECT_DB);
75}
76
77session_set_save_handler(
78"sess_open",
79"sess_close",
80"sess_read",
81"sess_write",
82"sess_destroy",
83"sess_gc");
84session_start();
85?>
86
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