Getting referer of script in PHP

Need to find url of site which called my script

[defireman]

I need to obtain the URL of the site that called one of my scripts. My code on client side looks like this:

<SCRIPT type="text/javascript" src="http://example.com/scripts/apiscript.php?key=[hash of site]">

on server side, what do I have to do to get the referer (calling url), so that I can use it to calcuate the required hash?

Thanks a lot!

[Gibble]

Check
$_SERVER['HTTP_REFERER']

[sunveria]

yes.....
using $HTTP_REFERER ....
check out the manual..

^ ^