Solutions to do referrer based advertising?

This a bit of a weird question so please let me know if you need more information.

For a side project I am working on I need to ability to generate advertising on a specific page based on a specified domain. I have looked a bit and haven't found anything that really fits this so I'm hoping someone here has a service like this or can push me in the correct direction. I'm not super interested in finding my own advertiser/rolling my own solution currently (not to say it wont happen in the future), looking for more of an out of the box solution.

Clarification: The advertising content on this page will be generated based upon the referral URL. So in other words instead of the advertising content bein开发者_StackOverflow社区g contextual to the page it is delivered on.. it is contextual to a domain/URL.

TYIA

I assume You are working with it the way Adsense works - a javascript makes an ajax call to a PHP file stored on your server which returns the content, which is afterwards added to the page. In such case I can think of two ways: 1. Use $_SERVER['HTTP_REFERER'], which won't always work; 2. Or send the current page address (window.location.href if I recall correctly) with the ajax call