title: Randomize external RSS feed order in PHP
body: <p>I'm using a third-party AJAX slideshow for a website that takes an RSS feed as its picture source.  I would like to randomize the order of the pictures, but that's not a feature of the slideshow (or the RSS feed I'm pulling from).</p>
  
  <p>Surely it shouldn't be difficult to write a short function in PHP that takes an external RSS feed, randomizes the items and re-publishes the same feed 'out of order'.  I just can't seem to make it work.</p>