protected function unpersist($id)
{
// the requested session file is not a valid file
if (apc_exists($id) === false) {
return;
}
// decode the session from the filesystem
if (($marshalled = apc_fetch($id)) === false) {
throw new SessionDataNotReadableException(sprintf('Can\'t load session with ID %s', $id));
}
// create a new session instance from the marshaled object representation
return $this->unmarshall($marshalled);
}