php to capture url (alias domain)?

[Anon]

I am a newcomer to PHP. I am using simple PHP scripts to send me emails of orders placed using our shopping cart.

I have several domain names which are aliases for my actual website:

Would it be possible for a PHP script to ascertain that the visitor used one of these aliases to reach the site?

e.g. they used closeout.com to entire the site (mainsite.com). 

Then I would want a PHP script to automatically take them to mainsite.com/closeout.html, for example.

Any help would be greatly appreciated.

Paul Drexler

[Anon]

apache uses HTTP_REFERER to store the url of the page that sent the folk to a page, so that should work perfectly for you.

[Anon]

someone suggested using HTTP_REFERER but be aware that that's the page they clicked from to get to the current site. HTTP_HOST is the current Host: header from the HTTP request.

if they're at "siteone.com/links.html" and click on a link to "sitetwo.com/page.php" from there, on page.php the HTTP_REFERER will be "siteone.com/links.html" but HTTP_HOST will be "sitetwo.com".

If you have a bunch of domains that all point to the same IP, and the same files, then HTTP_HOST will tell you which one they're using to access the site.