What domain is the page called from?

[vigour]

I'm building a search page in php. The page (search.php) is located on domain A. But I want several other domains to use this page. This is my idea.

Domain B have a search function in their menu system. When the user select it the search page from domain A will open in a frame on domain B. The problem is that the search page needs to know what domain it was called from. Domain C will also have the same search function and so on. Is this possible to do?

[leatherback]

Yes. You just call the search page with a variable attached:

search.php?domain=1

[dagon]

or

$_SERVER['HTTP_HOST']