How to Get Host Root Domain URL in PHP?

Suppose you have two or more domains that have image-copies of the same websites, and somewhere you would need to give a URL based on the current domain. For example, you would need to get values like http://helloacm.com or https://ranplan.co.uk or https://codingforspeed.com:8080 etc.

In PHP, the $_SERVER array contains some values that are useful to accomplish this task. The $_SERVER[‘SERVER_NAME’], $_SERVER[‘HTTP_HOST’] and $_SERVER[‘SERVER_PORT’].

$server_port = $_SERVER['SERVER_PORT'];
if ($server_port == 443)
{
  $server_name = "https://".$_SERVER['SERVER_NAME'];
}
else if ($server_port != 80) {
  $server_name = "http://".$_SERVER['SERVER_NAME']. ':' . $_SERVER['SERVER_PORT'];
}
else {
  $server_name = "http://".$_SERVER['SERVER_NAME'];
}

The difference between $_SERVER[‘SERVER_NAME’] and $_SERVER[‘HTTP_HOST’] is that the HTTP_HOST returns the port number while SERVER_NAME does not. The above script ignores adding port 80 and forces https if port 443 is used.

–EOF (The Ultimate Computing & Technology Blog) —