你可以试试这样的:

$file_name = 'file.avi';
$file_url = 'http://www.myremoteserver.com/' . $file_name;
header('Content-Type: application/octet-stream');
header("Content-Transfer-Encoding: Binary"); 
header("Content-disposition: attachment; filename="".$file_name."""); 
readfile($file_url);
exit;

我刚刚测试了它，它对我有用.

I just tested it and it works for me.

请注意，要使 readfile 能够读取远程 url，您需要拥有 fopen_wrappers 已启用.

Please note that for readfile to be able to read a remote url, you need to have your fopen_wrappers enabled.