PHP domain

[MPK]

Ok, the aim is to have
Welcome to thisdomain.com, the thing is that is going be put on multiple domains. I belive there is one variable in PHP which contains the domain, however I've forgotted name. If somebody could provide I'd be eternaliy gratefull

[Skunk]

$HTTP_HOST

The easiest way to look up variables like this is to view a PHP Info file - create a PHP file that looks like this and save it on your server:

<?php
phpinfo();
?>

Accessing that with your browser will bring up loads of information, including all of the environment variables (including stuff like HTTP_HOST).