Get Current URL with PHP. Inspired by CodeIgniter. Tested with Wordpress with and without fancy permalinks.

get_the_current_url.php

<?php

function get_the_current_url() {
    
    $protocol = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == "on") ? "https" : "http");
    $base_url = $protocol . "://" . $_SERVER['HTTP_HOST'];
    $complete_url =   $base_url . $_SERVER["REQUEST_URI"];
    
    return $complete_url;
     
}