title: PHP file_exists and wildcard
body: <p>Is there a way to write the PHP file_exists function so that it searches a directory for a file with an arbitrary extension.  For instance, suppose I knew that a file were called "hello", but I didn't know the extension, how would I write a function that searched for a file called hello.* and returned the name of this file?  As far as I can tell, file_exists will only search for a string.</p>
  
  <p>Thanks.</p>