Get full url include schema, port and optional request uri

serverUrl.php

<?php

function serverUrl($requestUri = null) {
    switch (true) {
        case (isset($_SERVER['HTTPS']) && ($_SERVER['HTTPS'] == 'on' || $_SERVER['HTTPS'] === true)):
        case (isset($_SERVER['HTTP_SCHEME']) && ($_SERVER['HTTP_SCHEME'] == 'https')):
            $scheme = 'https';
            break;
        default:
        $scheme = 'http';
    }

    if (!empty($_SERVER['HTTP_HOST'])) {
        $host = $_SERVER['HTTP_HOST'];
    } else if (isset($_SERVER['SERVER_NAME'], $_SERVER['SERVER_PORT'])) {
        $name = $_SERVER['SERVER_NAME'];
        $port = $_SERVER['SERVER_PORT'];

        $host = ($port != 80) ? $name . ':' . $port : $name ;
    }

    $path = ($requestUri === true) ? $_SERVER['REQUEST_URI'] : '/' ;

    return $scheme . '://' . $host . $path;
}