php die

<?php 
// blank url of site 
// so that die() is executed 
$site = ""; 
  
// open url else die (exit) 
fopen($site, "r") 
or die("Unable to connect to given site."); 
?> 

<?php
$site = "https://www.w3schools.com/";

fopen($site,"r")

or die("Unable to connect to $site");

?> 

die();