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File: tikisession-pdo.php
<?php
// (c) Copyright 2002-2015 by authors of the Tiki Wiki CMS Groupware Project
//
// All Rights Reserved. See copyright.txt for details and a complete list of authors.
// Licensed under the GNU LESSER GENERAL PUBLIC LICENSE. See license.txt for details.
// $Id: tikisession-pdo.php 53803 2015-02-06 00:42:50Z jyhem $

/* from
		http://www.spiration.co.uk/post/1333/PHP 5 sessions in mysql database with PDO db objects
*/

/**
 *
 */
class Session
{
	public $db;

	public function __destruct()
	{
		session_write_close();
	}

    /**
     * @param $path
     * @param $name
     * @return bool
     */
    public function open( $path, $name )
	{
		return true;
	}

    /**
     * @return bool
     */
    public function close()
	{
		return true;
	}

    /**
     * @param $sesskey
     * @return mixed
     */
    public function read($sesskey)
	{
		global $prefs;

		$bindvars = array( $sesskey );

		if ( $prefs['session_lifetime'] > 0 ) {
			$qry = 'select data from sessions where sesskey = ? and expiry > ?';
			$bindvars[] = $prefs['session_lifetime'];
		} else {
			$qry = 'select data from sessions where sesskey = ?';
		}

		return TikiDb::get()->getOne($qry, $bindvars);
	}

    /**
     * @param $sesskey
     * @param $data
     */
    public function write($sesskey, $data)
	{
		global $prefs;

		$expiry = time() + ( $prefs['session_lifetime'] * 60 );

		TikiDb::get()->query('delete from sessions where sesskey = ?', array( $sesskey ));
		TikiDb::get()->query('insert into sessions (sesskey, data, expiry) values( ?, ?, ? )', array( $sesskey, $data, $expiry ));
	}

    /**
     * @param $sesskey
     * @return int
     */
    public function destroy($sesskey)
	{
		$qry = 'delete from sessions where sesskey = ?';
		TikiDb::get()->query($qry, array( $sesskey ));
		return 1;
	}

    /**
     * @param $maxlifetime
     * @return int
     */
    public function gc($maxlifetime)
	{
		global $prefs;

		if ( $prefs['session_lifetime'] > 0 ) {
			$qry = 'delete from sessions where expiry < ?';
			TikiDb::get()->query($qry, array( time() ));
		}

		return 1;
	}
}

$session = new Session;
ini_set('session.save_handler', 'user');
session_set_save_handler(
	array($session, 'open'),
	array($session, 'close'),
	array($session, 'read'),
	array($session, 'write'),
	array($session, 'destroy'),
	array($session, 'gc')
);