Cloudinary::signed_preloaded_image PHP Method

    public static function signed_preloaded_image($result)
    {
        return $result["resource_type"] . "/upload/v" . $result["version"] . "/" . $result["public_id"] . (isset($result["format"]) ? "." . $result["format"] : "") . "#" . $result["signature"];
    }

 public function upload($file, $options = array())
 {
     $options['return_error'] = false;
     $ret = \Cloudinary\Uploader::upload($file, $options);
     $preloaded = new \Cloudinary\PreloadedFile(\Cloudinary::signed_preloaded_image($ret));
     if ($this->verifyUpload && !$preloaded . is_valid()) {
         throw new \Exception("Error! Couldn't verify cloudinary response!");
     }
     $this->_identifier = $preloaded->extended_identifier();
 }