Store Session Data in a MySQL Database
(Chapter 8, Shared Hosting - Pg 78-80)
< Back to Code Repository
<?php
/*
CREATE TABLE sessions
(
id varchar(32) NOT NULL,
access int(10) unsigned,
data text,
PRIMARY KEY (id)
);
+--------+------------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+------------------+------+-----+---------+-------+
| id | varchar(32) | | PRI | | |
| access | int(10) unsigned | YES | | NULL | |
| data | text | YES | | NULL | |
+--------+------------------+------+-----+---------+-------+
*/
session_set_save_handler('_open',
'_close',
'_read',
'_write',
'_destroy',
'_clean');
function _open()
{
global $_sess_db;
$db_user = $_SERVER['DB_USER'];
$db_pass = $_SERVER['DB_PASS'];
$db_host = 'localhost';
if ($_sess_db = mysql_connect($db_host, $db_user, $db_pass))
{
return mysql_select_db('sessions', $_sess_db);
}
return FALSE;
}
function _close()
{
global $_sess_db;
return mysql_close($_sess_db);
}
function _read($id)
{
global $_sess_db;
$id = mysql_real_escape_string($id);
$sql = "SELECT data
FROM sessions
WHERE id = '$id'";
if ($result = mysql_query($sql, $_sess_db))
{
if (mysql_num_rows($result))
{
$record = mysql_fetch_assoc($result);
return $record['data'];
}
}
return '';
}
function _write($id, $data)
{
global $_sess_db;
$access = time();
$id = mysql_real_escape_string($id);
$access = mysql_real_escape_string($access);
$data = mysql_real_escape_string($data);
$sql = "REPLACE
INTO sessions
VALUES ('$id', '$access', '$data')";
return mysql_query($sql, $_sess_db);
}
function _destroy($id)
{
global $_sess_db;
$id = mysql_real_escape_string($id);
$sql = "DELETE
FROM sessions
WHERE id = '$id'";
return mysql_query($sql, $_sess_db);
}
function _clean($max)
{
global $_sess_db;
$old = time() - $max;
$old = mysql_real_escape_string($old);
$sql = "DELETE
FROM sessions
WHERE access < '$old'";
return mysql_query($sql, $_sess_db);
}
?>
