Sanitizing server name

Hi,

I’m using $_SERVER['SERVER_NAME'] in my script to build a FROM email header.

I want to sanitize the value before using it, but having difficulties finding the proper function for that. I want to get the URL without http:// or https://.

Without sanitizing it will output the way I want:

$domain = $_SERVER['SERVER_NAME'];
www.my-domain.com

This will output the full URL:

$domain = esc_url_raw($_SERVER['SERVER_NAME']);
http://www.my-domain.com

This will strip the . characters from the URL:

$domain = sanitize_key($_SERVER['SERVER_NAME']);
wwwmy-domaincom

I prefer using a native PHP/WP function instead of using extra functions to alter my output, such as substr().

Any thoughts?

Guido