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gyro/core/model/base/dbsession.cls.php

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<?php
Load::models(array('sessions'));

/**
 * Redirect session to write to DB
 * 
 * @author Gerd Riesselmann
 * @ingroup Model
 */
class DBSession implements ISessionHandler {
        /**
         * Open a session
         */ 
        public function open($save_path, $session_name) {
                return true;
        }
        
        /**
         * Close a session
         */
        public function close() {
                //Note that for security reasons the Debian and Ubuntu distributions of 
                //php do not call _gc to remove old sessions, but instead run /etc/cron.d/php*, 
                //which check the value of session.gc_maxlifetime in php.ini and delete the session 
                //files in /var/lib/php*.  This is all fine, but it means if you write your own 
                //session handlers you'll need to explicitly call your _gc public function yourself.  
                //A good place to do this is in your _close public function
                
                $this->gc(ini_get('session.gc_maxlifetime'));
                return true;
        }
        
        /**
         * Load session data from database
         */
        public function read($key) {
                // Write and Close handlers are called after destructing objects since PHP 5.0.5
                // Thus destructors can use sessions but session handler can't use objects.
                // So we are moving session closure before destructing objects.
                register_shutdown_function('session_write_close');
                $sess = DB::get_item('sessions', 'id', $key);
                if ($sess) {
                        return $sess->data;                     
                }
                return '';
        }
        
        /**
         * Write session data to DB
         */
        public function write($key, $value) {
                try {
                        // Rollback any open transactions, if there are any
                        //DB::rollback();
                        $sess = DB::get_item('sessions', 'id', $key);
                        $err = false;
                        if ($sess) {
                                $sess->data = $value;
                                $err = $sess->update();
                        }
                        else {
                                $sess = new DAOSessions();
                                $sess->id = $key;
                                $sess->data = $value;
                                $err = $sess->insert();
                        }
                        return $err->is_ok();
                }
                catch(Exception $ex) {
                        return false;
                }       
        }
        
        /**
         * Delete a session
         */
        public function destroy($key) {
                try {
                        $sess = new DAOSessions();
                        $sess->id = $key;
                        $sess->delete();
                }
                catch(Exception $ex) {}
        }
        
        /**
         * Delete outdated sessions
         */
        public function gc($lifetime) {
                if (!Session::is_started()) {
                        return;
                }
                try {
                        $sess = new DAOSessions();
                        $sess->add_where('modificationdate', '<', time() - $lifetime);  
                        $sess->delete(DataObjectBase::WHERE_ONLY);
                }
                catch (Exception $ex) {}
                
                return true;
        }
}

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