方法一的在thinkphp中，即便是debug开启状态也不会有影响，而方法2的下载，再thinkphp开启debug的情况下，有关debug的页面对应的源代码会随着txt嵌入其中一起被下载，目前所发现的事fastadmin中，有此现象，特此记录一下
方法一：

header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($filepath));
header('Content-Transfer-Encoding: binary');
header('Expires: 0′);
header('Cache-Control: must-revalidate, post-check=0, pre-check=0′);
header('Pragma: public');
header('Content-Length: ' . filesize($filepath));
readfile($file_path);

方法二：

$fileinfo = pathinfo($filename);
header('Content-type: application/x-'.$fileinfo['extension']);
header('Content-Disposition: attachment; filename='.$fileinfo['basename']);
header('Content-Length: '.filesize($filename));
readfile($thefile);
exit();