使用session_set_save_handler函数重载SESSION存储方式之MYSQL_PHP教程

$DB_SERVER = "server"; /* database server hostname */
$DB_NAME = "dbname"; /* database name */
$DB_USER = "root"; /* database user */
$DB_PASS = "*************"; /* database password */

$DB_SELECT_DB = "";
$SESS_LIFE = get_cfg_var("session.gc_maxlifetime");

function sess_open($save_path, $session_name) {
global $DB_SERVER, $DB_NAME, $DB_USER, $DB_PASS, $DB_SELECT_DB;

if (! $DB_SELECT_DB = mysql_pconnect($DB_SERVER, $DB_USER, $DB_PASS)) {
echo "SORRY! MYSQL ERROR : Cant connect to $DB_SERVER as $DB_USER";
echo "MySQL Error: ", mysql_error();
die;
}

if (! mysql_select_db($DB_NAME, $DB_SELECT_DB)) {
echo "SORRY! MYSQL ERROR : Unable to select database $DB_NAME";
die;
}

return true;
}

function sess_close() {
return true;
}

function sess_read($SessionKey){
global $DB_SELECT_DB, $SESS_LIFE;
$Query = "SELECT SessionArray FROM cdb_global_sessions WHERE SessionKey = ".$SessionKey." AND SessionExpTime > " . time();
$Result = mysql_query($Query, $DB_SELECT_DB);

if (list($SessionArray) = mysql_fetch_row($Result)) {
return $SessionArray;
}

return false;
}

function sess_write($SessionKey, $VArray) {
global $DB_SELECT_DB, $SESS_LIFE;

$SessionExpTime = time() + $SESS_LIFE;
$SessionArray = addslashes($VArray);

$Query = "INSERT INTO cdb_global_sessions (SessionKey,SessionExpTime,SessionArray) VALUES (".$SessionKey.",".$SessionExpTime.",".$SessionArray.")";
$Result = mysql_query($Query, $DB_SELECT_DB);

if (!$Result){
$Query = "UPDATE cdb_global_sessions SET SessionExpTime = ".$SessionExpTime.", SessionArray = ".$SessionArray." WHERE SessionKey = ".$SessionKey." AND SessionExpTime > " . time();
$Result = mysql_query($Query, $DB_SELECT_DB);
}
return $Result;
}

function sess_destroy($SessionKey) {
global $DB_SELECT_DB;

$Query = "DELETE FROM cdb_global_sessions WHERE SessionKey = ".$SessionKey."";
$Result = mysql_query($Query, $DB_SELECT_DB);

return $Result;
}

function sess_gc($maxlifetime) {
global $DB_SELECT_DB;

$Query = "DELETE FROM cdb_global_sessions WHERE SessionExpTime < " . time();
$Result = mysql_query($Query, $DB_SELECT_DB);

return mysql_affected_rows($DB_SELECT_DB);
}

session_set_save_handler(
"sess_open",
"sess_close",
"sess_read",
"sess_write",
"sess_destroy",
"sess_gc");

session_start();
?>