What other PHP variables can be used to reliably retrieve the domain name with or without www in a consistent manner?

When retrieving the domain name from a URL in PHP, the $_SERVER['HTTP_HOST'] variable can be used to reliably get the domain name with or without the www prefix. This variable will return the host name provided in the HTTP request, which typically includes the domain name. By using this variable, you can ensure consistency in retrieving the domain name regardless of whether the www prefix is present. 

$domain = $_SERVER['HTTP_HOST'];
echo $domain;

Keywords

$_SERVER parse_url preg_replace str_replace domain name

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