Zend\Stratigility\Http\Request::getAttribute PHP Method

    public function getAttribute($attribute, $default = null)
    {
        return $this->psrRequest->getAttribute($attribute, $default);
    }

 /**
  * getFileName
  *
  * @param Request $request
  *
  * @return string|null
  */
 protected function getFileName(Request $request)
 {
     return $request->getAttribute(self::PARAM_FILE_PATH);
 }