remove http://www. and https://www. from user website url info

I found this:

$input = 'www.google.co.uk/';

// in case scheme relative URI is passed, e.g., //www.google.com/
$input = trim($input, '/');

// If scheme not included, prepend it
if (!preg_match('#^http(s)?://#', $input)) {
    $input = 'http://' . $input;
}

$urlParts = parse_url($input);

// remove www
$domain = preg_replace('/^www\./', '', $urlParts['host']);

echo $domain;

// output: google.co.uk

But where and especially how do I place this, so the URL showing on profiles will be shorter. Example:
https://www.facebook.com/help/notifications > facebook.com/help/notifications
We all know that http:// is back to the 90’s and www is gone in the most browsers, so why showing old URL’s, right?

Only the showing URL and not the hardcoded URL 🙂