<?php
# MySessions v1.0 - MySQL Based Sessions
# Copyright (C) 2008 João Romão - iceburn.info
#
# 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 3 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, see <http://www.gnu.org/licenses/>.
/**
* MySessions v1.0
*
* @package MySQL Based Sessions v1.0
* @author João Romão (aka =IceBurn=)
* @copyright João Romão - iceburn.info
* @version 2008
* @access public
*
*/
class MySessions
{
/**
* Define if the session_id should be always regenerated
*
* Setting this to true will improve security,
* but also increase memory usage.
*/
const always_regenerate = true;
/**
* use: mydomain.com or leave blank OR .mydomain.com to keep sessions between sub-domains.
* @var string
*/
public $cookie_domain = '';
/**
* usually '/' it's just fine
* @var string
*/
public $cookie_path = '/';
/**
* Sessions lifetime in seconds
* @var int
*/
public $sess_duration = 2300;
/**
* Table name to store sessions.
* @var string
*/
public $table_name = 'sessions';
/**
* Should sessions be passed to URL's? 0 = no / 1 = yes (not recomended!)
* @var bool
*/
public $use_trans_id = 0;
/**
* The name for the session (PHP's default is the ugly PHPSESSIONID)
* @var string
*/
public $session_name = 'sess';
/**
* sessions::__construct()
*
* @access public
* @return void
*/
public function __construct() {
/**
* Comment the ini_set block if you get errors
* Errors happen when your host does not allow you to use ini_set function
* Try use htaccess php_value/php_flag directive instead
*/
ini_set('session.use_cookies', 1);
ini_set('session.use_trans_sid', $this->use_trans_id);
ini_set('session.use_only_cookies', 0);
ini_set('session.gc_maxlifetime', $this->sess_duration);
ini_set('session.hash_bits_per_character', 4);
ini_set('session.name', $this->session_name);
session_set_save_handler(array('MySessions', 'open'), array('MySessions', 'close'),
array('MySessions', 'read'), array('MySessions', 'write'),
array('MySessions', 'destroy'), array('MySessions', 'gc'))
or die('Could Not Set Session Handler!');
session_set_cookie_params($this->sess_duration, $this->cookie_path, $this->cookie_domain);
}
/**
* MySessions::session_start()
*
* @return void
*/
public function session_start() {
session_start();
$this->regenerate();
}
/**
* MySessions::regenerate()
*
* A session is regenerated either if specified in configurations or if somehow
* an invalid session_id is passed or if implicit.
* @param integer $force
* @return bool
*/
public function regenerate($force = 0) {
if (self::always_regenerate == true || strlen($this->protect(session_id())) != 32 || $force != 0) {
$sid = session_id();
session_regenerate_id(true);
$nid = session_id();
$qry = "UPDATE `" . $this->table_name . "` SET `id` = '" . $this->protect($nid) . "' WHERE id = '" . $this->protect($sid) . "';";
return mysql_query($qry);
}
}
/**
* sessions::open()
*
* @access public
* @param mixed $sess_path
* @param mixed $sess_name
* @return bool
*/
public function open($sess_path, $sess_name) {
return true;
}
/**
* sessions::close()
*
* @access public
* @return bool
*/
public function close() {
return true;
}
/**
* sessions::read()
*
* @access public
* @param mixed $sess_id
* @return string
*/
public function read($sess_id) {
$sql = "SELECT `data` FROM `" . $this->table_name . "` WHERE `id` = '" . $this->protect($sess_id) . "' ORDER BY `id` LIMIT 1;";
$res = mysql_query($sql);
if ($res) {
if (mysql_num_rows($res) == 1) {
$ret = mysql_result($res, 0, 0);
mysql_free_result($res);
return $ret;
}
}
return;
}
/**
* sessions::write()
*
* @access public
* @param mixed $sess_id
* @param mixed $data
* @return bool
*/
public function write($sess_id, $data) {
$sql = "INSERT INTO
`" . $this->table_name . "` (
`id`,
`access`,
`data`
) VALUES (
'" . $this->protect($sess_id) . "',
" . time() . ",
'" . mysql_real_escape_string($data) . "'
) ON DUPLICATE KEY UPDATE
`access` = " . time() . ",
`data` = '" . mysql_real_escape_string($data) . "';";
return mysql_query($sql) or die('Error Writing Session Data!');
}
/**
* sessions::destroy()
*
* Session destroy, useful for logouts
* @access public
* @param mixed $sess_id
* @return bool
*/
public function destroy($sess_id) {
$_SESSION = array();
if (isset($_COOKIE[$this->session_name])) {
setcookie($this->session_name, '', (time() - 42000), $this->cookie_path, $this->cookie_domain);
}
$sql = "DELETE FROM `" . $this->table_name . "` WHERE `id` = '" . $this->protect($sess_id) . "';";
return mysql_query($sql) or die('Error Destroing Session Data!');
}
/**
* sessions::gc()
*
* Garbage collector
* @access public
* @param mixed $sess_maxlifetime
* @return bool
*/
public function gc($sess_maxlifetime) {
$old = (time() - $this->sess_duration);
$sql = "DELETE FROM `" . $this->table_name . "` WHERE `access` < " . intval($old) . ";";
$qry = mysql_query($sql);
/**
* You can comment the optimize part, and optimize your tables in an independent way.
* In fact it's addvised that you do it, especially if you have a hight traffic load.
*/
if (mysql_affected_rows() > 0) { $this->optimize(); }
return true;
}
/**
* sessions::optimize()
*
* Usefull function for optimizing your sessions table.
* @access public
* @return bool
*/
public function optimize() {
return mysql_query('OPTIMIZE TABLE `' . $this->table_name . '`;');
}
/**
* sessions::create_table()
*
* You can call this function at the first run to create the necessary table.
* No problem to call it after the table is created, but will increase memory.
* If the table does not exist, the very first call to sessions will be stored
* as usual. It will always return true or die() if fail to create table.
* @access public
* @return bool
*/
public function create_table() {
$sql = "CREATE TABLE IF NOT EXISTS `" . $this->table_name . "` (";
$sql .= " `id` varchar(32) NOT NULL,";
$sql .= " `access` int(10) unsigned default NULL,";
$sql .= " `data` text,";
$sql .= " PRIMARY KEY (`id`) ";
$sql .= ") ENGINE=MyISAM DEFAULT CHARSET=latin1;";
$qry = mysql_query($sql) or die('An Error Occorred: ' . mysql_error());
$this->regenerate(1);
return true;
}
/**
* sessions::protect()
*
* @access private
* @param mixed $string
* @return string
*/
private function protect($string) {
return mysql_real_escape_string(preg_replace('/[^a-v0-9]/i', '', $string));
}
/**
* MySessions::debug()
*
* Only for debugging reasons.
* @return string
*/
public function debug() {
$ret = var_dump($_COOKIE);
$ret .= var_dump($_SESSION);
return $ret;
}
/**
* MySessions::__destruct()
*
* @return void
*/
public function __destruct() {
session_write_close();
}
} // End of class 'MySessions'
?>
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