driver = $driver; } public function open($save_path, $name) { return $this->driver->open($save_path, $name); } public function close() { return $this->driver->close(); } public function read($id) { return $this->driver->read($id); } public function write($id, $data) { return $this->driver->write($id, $data); } public function destroy($id) { return $this->driver->destroy($id); } public function gc($maxlifetime) { return $this->driver->gc($maxlifetime); } }