get_current_url.php

<?php
    /**
     * @see: https://www.phpfreelancer.org/blog/php-get-current-url.php
     */
    function get_current_url()
    {
        $url = false;
 
        // check whether this script is being run as a web page
        if (isset($_SERVER['SERVER_ADDR']))
        {
            $is_https   = isset($_SERVER['HTTPS']) && 'on' == $_SERVER['HTTPS'];
            $protocol   = 'http' . ($is_https ? 's' : '');
            $host       = isset($_SERVER['HTTP_HOST'])
                            ? $_SERVER['HTTP_HOST']
                            : $_SERVER['SERVER_ADDR'];
            $port       = $_SERVER['SERVER_PORT'];
            $path_query = $_SERVER['REQUEST_URI'];
 
            $url = sprintf('%s://%s%s%s',
                $protocol,
                $host,
                $is_https
                    ? (443 != $port ? ':' . $port : '')
                    : ( 80 != $port ? ':' . $port : ''),
                $path_query
            );
        }
 
        return $url;
    }