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);