RollingCurl\RollingCurl::add PHP Method

    public function add(Request $request)
    {
        $this->pendingRequests[] = $request;
        return $this;
    }

 /**
  * Prepares a passed in data array with img elements that need to be fetched from remote server and changed to point to a local resource.
  *
  * @param DOMDocument $doc 	The DOMDocument to evaluate img elements for
  * @param \RollingCurl\RollingCurl $rollingCurl 		The RollingCurl instance to add our requests to
  * @param string $tempDirPath   The directory to store images
  * @param array $imgData 	The data array to populate
  */
 private function prepareImageRequests($doc, $rollingCurl, $tempDirPath, $imgData)
 {
     global $wgServer;
     // Ensure there's a trailing slash after our $wgServer name
     if (substr($wgServer, -1) !== '/') {
         $search = $wgServer .= '/';
     } else {
         $search = $wgServer;
     }
     $imgElements = $doc->getElementsByTagName('img');
     foreach ($imgElements as $imgElement) {
         $src = $imgElement->getAttribute('src');
         // Strip the server and slash from our image src
         $localPath = str_replace($search, '', $src);
         $pathInfo = pathinfo($localPath);
         // Create the directory locally to mimic the directory structure of the server
         $localPath = $tempDirPath . '/' . $pathInfo['dirname'];
         if (!is_dir($localPath)) {
             $result = mkdir($localPath, 0777, true);
             if (!$result) {
                 throw new Exception("Failed to create temp directory: {$localPath}");
             }
         }
         $localPath = $localPath .= '/' . $pathInfo['basename'];
         $zipPath = $pathInfo['dirname'] . '/' . $pathInfo['basename'];
         $request = new \RollingCurl\Request($src);
         $imgData[] = array('src' => $src, 'element' => $imgElement, 'extension' => $pathInfo['extension'], 'local_path' => $localPath, 'new_path' => $zipPath, 'request' => $request);
         $rollingCurl->add($request);
     }
 }