title: Out of date file being requested from a PHP script that no longer references it?
body: <p>I'm running a LAMP stack on Amazon EC2 for an AJAX focussed application written in PHP with APC caching.  I'm sorry if this is the wrong forum but I don't really know if the problem is my server or my code.</p>
  
  <p>One particular ajax call (which always has unique parameters) in my app returns some html with an iframe in it with myphpfile.php as the src (to force evaluation of myphpfile.php - there are better ways to do it sure, but I couldn't find them years ago when I wrote the code!).  Yesterday I changed the src variable to myhtmlfile.html and yet there are still clients out there requesting the old myphpfile.php despite there being no reference to it anywhere on my server.</p>
  
  <p>I have cleared the APC cache (by doing an apache2 restart).  The vast majority of users are going to the new file, but still 1 or 2 per minute or so are going to the old file (that's not much % of my traffic, but I like to take care of my traffic!).  The ones still using the old file tend to be iphone users.</p>
  
  <p>I just have no idea where it could be getting any reference to the old myphpfile.php - it isn't in the php file, not in the apc cache.  What else do I have to clear?</p>