public function open()
{
$session_class = "C{$this->driver}Session";
if (!self::$__opened && class_exists($session_class)) {
$handler = new $session_class($this);
session_set_save_handler(array($handler, 'open'), array($handler, 'close'), array($handler, 'read'), array($handler, 'write'), array($handler, 'destroy'), array($handler, 'gc'));
register_shutdown_function('session_write_close');
session_start();
self::$__opened = true;
}
}
