How to compare a link with a benchmark?

Question

PHP

Good afternoon.
There are two variables: one is the link specified by default on the server.
The second is the link received from the post request.
How can I compare them (do I need the domain name to match)?

$a = $_POST['link'];
$b = 'domain.com';

I understand that you need to parse the link in a via preg_replace, but I don't understand how to do it to leave only the domain.

Answer 1

$url = 'https://google.com';

var_dump(parse_url($url, PHP_URL_HOST));