php获得当前的脚本网址

php获得当前脚本的网址，代码：

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