[SOLVED] Require() and Include() redirect

[random1]

How do you redirect to another page if a .php file fails (not found) on require("pagename.php") or include()?

 

Currently it just shows blank white window.

[~n[EO]n~]

<?php
$filename = 'pagename.php';

if (file_exists($filename)) {
    require_once('pagename.php');;
} else {
    header ("Location: index.php"); /* Redirect browser */
/* Make sure that code below does not get executed when we redirect. */
exit;

}
?>