I'm trying to get videos keywords using video id (or url).  

I've googled it and found ways to get videos info (title, length,..etc) but didn't find a way to get keywords.  

So..how to retrieve a youtube video keywords with php

code:

```
    $entry = simplexml_load_file('http://gdata.youtube.com/feeds/api/videos/gzDS-Kfd5XQ?v=2');
    $keywords = (string) $entry->children('media', TRUE)->group->keywords;

    $keywords_array = explode(", ", $keywords);
    print_r($keywords_array);

```