Undefined index: REDIRECT_URL

[s0me0ne]

I've been getting the following error:
Undefined index: REDIRECT_URL

I can get past it with
if(isset($_SERVER['REDIRECT_URL']))

but I'm curious if its because I'm using a different version of Apache or something on one test machine than the other? If so what is the equivalent of the REDIRECT_URL on other versions of Apache? 😕

[NogDog]

Best thing to do would be a test to output all $SERVER elements and see what looks like the one you need:

<?php
header('Content-Type: text/plain');
print_r($_SERVER);
?>