$_SERVER["REDIRECT_URL"] works differently

[Case]

I want to use a custom 404 page called 'error.php'.

I have one line in my .htaccess:
ErrorDocument 404 /error.php

In error.php I'm using $_SERVER["REDIRECT_URL"] to show to the URL that resulted in the 404.

On one server this works perfect, it shows the URL requested.

On another server this results in '/error.php'.
I've tried everything, but don't understand why it doesn't work.

Can anyone give me some help here?
Thanks,
Case Stevens

[jdMorgan]

It might be helpful to you to try (temporarily) dumping all the variables in your error document:

<?
phpinfo( INFO_variables );
?>

You might find one that works for your needs across multiple platforms.

There's a lot more PHP expertise over in our PHP forum [webmasterworld.com].

Jim

[Key_Master]

Try $_SERVER["REQUEST_URI"]

[Case]

Thanks you both for terrific answers.

The $_SERVER["REQUEST_URI"] did it!

Learned something, much appreciated.
Regards,
Case