title: PHP __autoload performance
body: <p>I have a script that uses <code>autoload</code> to load classes that aren't found. I don't deliberately include the file (though I can) but I would like the autoload function to include the required files.</p>
  
  <p>Because the script can be recursive, that is if the class is already loaded, I don't want to check the corresponding file is loaded and if <code>class_exists</code> on each recursion of the script. </p>