If Current url is https://phpgurukul.com/how-to-get-current-page-url-in-php/

1 2	$url=$_SERVER['REQUEST_URI']; echo $url;

Output :
/how-to-get-current-page-url-in-php/REQUEST_URI  return only  root website folder instead of returning full page.
if you want actual link then use this syntax

1 2	$actual_link = "https://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]"; echo $actual_link ;

Output :
https://phpgurukul.com/how-to-get-current-page-url-in-php/ In the above code $_SERVER[‘HTTP_HOST’] return the  domain name through which the current request is being fulfilled.