class.ilSessionDBHandler.php

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<?php

/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

include_once("./Services/Authentication/classes/class.ilSession.php");

class ilSessionDBHandler
{       
        /*
        * register callback functions
        * session.save_handler must be 'user' or safe mode off to succeed
        */
        public function setSaveHandler()
        {
                // register save handler functions
                if (ini_get("session.save_handler") == "user")
                {
                        session_set_save_handler(
                                array($this, "open"),
                                array($this, "close"),
                                array($this, "read"),
                                array($this, "write"),
                                array($this, "destroy"),
                                array($this, "gc"));

                                return true;
                }

                return false;
        }
        
        /*
        * open session, normally a db connection would be opened here, but
        * we use the standard ilias db connection, so nothing must be done here
        *
        * @param        string          $save_pathDSN   information about how to access the database, format:
        *                                                                               dbtype(dbsyntax)://username:password@protocol+hostspec/database
        *                                                                               eg. mysql://phpsessmgr:topsecret@db.example.com/sessiondb
        * @param        string          $name                   session name [PHPSESSID]
        */
        public function open($save_path, $name)
        {
                return true;
        }

        public function close()
        {
                return true;
        }    

        /*
        * Reads data of the session identified by $session_id and returns it as a
        * serialised string. If there is no session with this ID an empty string is
        * returned
        *
        * @param        integer         $session_id             session id
        */
        public function read($session_id)
        {
                return ilSession::_getData($session_id);
        }

        public function write($session_id, $data)
        {
                $cwd = getcwd();
                chdir(IL_INITIAL_WD);
                include_once("./Services/Authentication/classes/class.ilSession.php");
                $r = ilSession::_writeData($session_id, $data);
                // see bug http://www.ilias.de/mantis/view.php?id=18000
                //chdir($cwd);
                return $r;
        }

        public function destroy($session_id)
        {
                return ilSession::_destroy($session_id);
        }

        public function gc($gc_maxlifetime)
        {
                return ilSession::_destroyExpiredSessions();
        }
}

// needs to be done to assure that $ilDB exists,
// when db_session_write is called
register_shutdown_function("session_write_close");

?>