php获得当前的脚本网址

//获得当前的脚本网址
function GetCurUrl(){
    if(!empty($_SERVER["REQUEST_URI"])){
        $scriptName = $_SERVER["REQUEST_URI"];
        $nowurl = $scriptName;
    }else{
        $scriptName = $_SERVER["PHP_SELF"];
        if(empty($_SERVER["QUERY_STRING"])) $nowurl = $scriptName;
        else $nowurl = $scriptName."?".$_SERVER["QUERY_STRING"];
    }
    return $nowurl;
}