强制下载php [关闭]

Question

I am trying to create a force-download page to prevent browsers from opening files that should be downloaded. The problem is that the downloaded file has 0 bytes and thus is unusable. What is wrong with my code?

$file = "http://gh0stsec.zxq.net/background1.jpg";
header("Pragma: public");
header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Content-Type: application/force-download");
header("Content-Disposition: attachment; filename=".basename($file));
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filename));
header("Content-Description: File Transfer");
@readfile($file);
exit();

Answer 1

check:

header("Content-Length: ".filesize($filename));

I think it should be:

header("Content-Length: ".filesize($file));