header 头各种类型文件下载

function down_file($url,$type='application/zip'){     header("Cache-Control: public");      header("Content-Description: File Transfer");      header('Content-disposition: attachment; filename='.basename($url)); //文件名        header("Content-Type: ".$type); //zip格式的        header("Content-Transfer-Encoding: binary"); //告诉浏览器，这是二进制文件         header('Content-Length: '. filesize($url)); //告诉浏览器，文件大小        @readfile($url); }