获取完整URL地址/网址

$pageURL = 'http';
            if ($_SERVER["HTTPS"] == "on") 
            {
                $pageURL .= "s";
            }
            $pageURL .= "://";
            if ($_SERVER["SERVER_PORT"] != "80") 
            {
                $pageURL .= $_SERVER["SERVER_NAME"] . ":" . $_SERVER["SERVER_PORT"] . $_SERVER["REQUEST_URI"];
            } 
            else 
            {
                $pageURL .= $_SERVER["SERVER_NAME"] . $_SERVER["REQUEST_URI"];
            }