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;
}