title: Capital letters in class name PHP
body: <p>I have two classes in my system. One is called file and second is File.
  On my localhost when i instantiate file i get file object, but my friend running the same script gets object of File like the capital letters were unrecognized and "file" was equal to "File".
  Is that some configurable thing?
  We are both running on Windows. I have WampServer, he has XAMPP.</p>