Question

I tried $_SERVER['HTTP_HOST'] & $_SERVER['SERVER_NAME'], but they both return sub.domain.com, I want it to check if the URL is sub.domain.com, or just domain.com.

Script is run on sub.domain.com and they BOTH return the same data.

$_SERVER['HTTP_HOST'] returns: sub.domain.com
$_SERVER['SERVER_NAME'] returns: sub.domain.com

I wish to obtain only the domain.com portion of the url. Since the script may run on any subdomain name, I am unsure of how to do so since both of the above variables return the same information.

Answer 1

I would check HTTP_HOST. Usually both are the same, but sometimes SERVER_NAME is set differently. When in doubt, check them both.

‘HTTP_HOST’
Contents of the Host: header from the current request, if there is one.

http://php.net/manual/en/reserved.variables.server.php

As for how to check them, you could do a string replace on it for the primary domain name and see if the result string is empty. Anything left would be the subdomain.

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As far you’re looking for some trivial string operation, here the last two parts:

$yourhost = implode('.', array_slice(explode('.', $_SERVER['HTTP_HOST']), -2));