如何检查Referrer URL是PHP脚本中的域或子域

Question

I want to check the Referrer url is Main Domain or Sub domain, domain can be anything like .com , .net ,.co.in , in .. Sub Domain also can be different type… any one can suggest idea in PHP script …..

For e.g if referrer url is http://google.com is the Domain, http://in.google.net is the sub domain

Answer 1

This should do the trick. (Haven't tested the code - so please take as a suggestion only)

<?php
$fromOtherDomain = !preg_match('/^https?:\/\/' . preg_quote($_SERVER['HTTP_HOST']) . '/i', $_SERVER['HTTP_REFERRER']);
?>