How to display different links depending on the url?

Question

PHP

Good afternoon.
Superstrange question, but it is important to understand whether it is possible to do so
.
Two domains A.site.ru and B.site.ru lead to 1 page.
It is necessary: ​​depending on the domain, substitute either one link or another.

Answer 1

Found the answer.
You can get a subdomain like this:

array_shift((explode('.', $_SERVER['HTTP_HOST'])));

and then put a condition on the conclusion