php 获取当前url，可以规避框架url重写后还有index.php的情况

function get_url(){
        $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"];
        }
        return $pageURL;
}