Vimeo video - get duration

vimeo.php

https://stackoverflow.com/questions/7772825/how-to-get-length-of-a-vimeo-video

echo vimeoVideoDuration('https://vimeo.com/115134273');
// output: 63 (video duration in seconds)

/**
* Vimeo video duration in seconds
*
* @param $video_url
* @return integer|null Duration in seconds or null on error
*/
function vimeoVideoDuration($video_url) {

   $video_id = (int)substr(parse_url($video_url, PHP_URL_PATH), 1);

   $json_url = 'http://vimeo.com/api/v2/video/' . $video_id . '.xml';

   $ch = curl_init($json_url);
   curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
   curl_setopt($ch, CURLOPT_HEADER, 0);
   $data = curl_exec($ch);
   curl_close($ch);
   $data = new SimpleXmlElement($data, LIBXML_NOCDATA);

   if (!isset($data->video->duration)) {
       return null;
   }

   $duration = $data->video->duration;

   return $duration; // in seconds
}