title: Get all video ID's from a YouTube playlist into a PHP array
body: <p>My goal is to use a playlist ID to get the video ID of each video within that playlist.</p>
  
  <p>I'm having trouble figuring out YouTube's API (I'm a relatively new programmer).</p>
  
  <p>Basically, I want to:</p>
  
  <ol>
  <li>Send an XML request to <a href="http://gdata.youtube.com/feeds/api/playlists/ID_OF_PLAYLIST" rel="nofollow">http://gdata.youtube.com/feeds/api/playlists/ID_OF_PLAYLIST</a></li>
  <li>Using the response (which is the part I don't understand how to navigate), append all the video IDs to an array.</li>
  </ol>
  
  <p>Seems pretty straightforward.  I've been grabbing the information from YouTube using <code>simplexml_load_file($url);</code> in case that is important.</p>
  
  <p>Thanks for the help!</p>