php下载服务器上的文件

   $file_xls=$path;    //   文件的保存路径

   $example_name=basename($file_xls);  //获取文件名

   header('Content-Description: File Transfer');
   header('Content-Type: application/octet-stream');
   header('Content-Disposition: attachment; filename='.mb_convert_encoding($example_name,"gb2312","utf-8"));  //转换文件名的编码
   header('Content-Transfer-Encoding: binary');
   header('Expires: 0');
   header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
   header('Pragma: public');
   header('Content-Length: ' . filesize($file_xls));
   ob_clean();
   flush();
   readfile($file_xls);