一个PHP类的问题，为什么我提交了参数会报错呢，各位大神求教，感谢了！！

class TokenStorage{

	public function performAction($action,$data){

		switch ($action){

			case 'create':

			$this->createToken($data);

			break;

			case 'delete':

			$this->clearToken($data);

			break;

			default:

			throw new Exception('unknown action');

		}

	}

	

	public function createToken($seed){

		$token = md5($seed);

		file_put_contents('D:\\phpStudy\\PHPTutorial\\WWW\\day6\\'.$token,'....data');

	}

	

	public function clearToken($token){

		$file=preg_replace("/[^a-z.-_]","",$token);

		unlink('D:\\phpStudy\\PHPTutorial\\WWW\day6\\'.$file);

	}

	

	

}

$storage= new TokenStorage();

$storage->performAction($_GET['action'],$_GET['data']);



//action = delete＆data