Looking for complete entered URL

	I've written a script that logs all visits to a web site, complete with referrer and IP address.  It also logs all 4xx errors.  What I'd like to add to this is, if someone adds extra code after the page_name.php, to be able to capture any extra code and log that.

	I've tried:

$_SERVER['QUERY_STRING']
$_SERVER['REDIRECT_QUERY_STRING']
$_SERVER['REDIRECT_URL']

but nothing seems to get logged.

	Is there a way, when either a false url is entered and a 404 is generated, or just when someone tacks on extra code to the URL, that I can grab that extra info?  I'm looking for the complete URL that was entered by the user, not anything returned by the server.

	I've created my own 4xx_error.php files which calls my tracking script, along with creating the proper ErrorDocument lines in the main .htaccess file.

	There are a lot of pages that have come up in my search, but nothing seems to pertain to what I'm trying to do.

Thank you,
Angela

BTW, I know about Piwik and I use that, as well.  This is something I'm doing on my own.