<?php
function MyPageLoader( $bestand ) { 
  $function = __FUNCTION__; // Only workaround to get it trough.
  if(!include($bestand)) { 
    return false; 
  } else 
    return true; 
} 

MyPageLoader('include.php'); 
?>

include.php:
<?php 
debug_backtrace();
print 'This page has been called by function '.__FUNCTION__.'.'; 
?>