php服务器提示下载功能解决思路

#down.php
$file = 'ASDFGgg.pdf';
_Download("files_dir/".$file, $file);

function _Download($f_location,$f_name){
     header ("Cache-Control: must-revalidate, post-check=0, pre-check=0");
   header('Content-Description: File Transfer');
   header('Content-Type: application/octet-stream');
   header('Content-Length: ' . filesize($f_location));
   header('Content-Disposition: attachment; filename=' . basename($f_name));
   readfile($f_location); 
 }

------解决方案--------------------

探讨


我在LocalSettings.php上加了这3行代码：
PHP code

header("Content-type:application/rar");

header("Content-Disposition:attachment;filename=SQLite.rar");

readfile("E:\ziptest\SQLite.rar");


登录首页的时候，有下载提示，但是……