PHP Emailing myself the referer [on hold]

So the way it works, is they go to the site and it emails me where they clicked it from (referer)

I need a code that when somebody visits the site, it will email me the referer to that page.

So let's say they click the link in www.google.com it would send me an email saying www.google.com

I've tried so many scripts but always get the error after error

Ideas?