/**
  * @return array
  */
 public function exportData()
 {
     $data = parent::exportData();
     if (isset($data[AdImageFields::FILENAME])) {
         if (version_compare(PHP_VERSION, '5.5.0') >= 0) {
             $data[AdImageFields::FILENAME] = curl_file_create($data[AdImageFields::FILENAME]);
         } else {
             $data[AdImageFields::FILENAME] = '@' . $data[AdImageFields::FILENAME];
         }
     }
     return $data;
 }