Description:
------------
For large projects that are coded without any sort of directed structure, it's often very difficult to know where a user defined function is defined / located.

What would be great to add to PHP would be a function that finds the filename / line # that the function is defined:

See below for how it would work.  I think this'd be a big help to a lot of developers.  Thanks in advance, guys!

Reproduce code:
---------------
<?php

   // This Filename = "sample.php"

   function GenericFunction()
   {
       return $x;
   }

   $arr = Function_Find_Def("GenericFunction");
   echo "<BR>" . $arr["FileName"];
   echo "<BR>" . $arr["LineNumber"];

Expected result:
----------------
sample.php
Line 5