Let PHP provide users with file downloads faster_PHP Tutorial

However, if you do this, you won't be able to do some statistics, permission checks, etc. Therefore, many times, we use PHP to do the forwarding and provide users with file downloads .

$file = "/tmp/dummy.tar.gz";

header("Content-type: application/octet-stream");

header('Content-Disposition: attachment; filename="' . basename($file) . '"');

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

readfile($file);

But there is a problem with this, that is, if the file has a Chinese name, some users may download the file name with garbled characters.

So, let’s make some modifications (reference: :

$file = "/tmp/中文名.tar.gz";

$filename = basename($file);

header("Content-type: application/octet-stream");

//Process Chinese file names

$ua = $_SERVER["HTTP_USER_AGENT"];

$encoded_filename = urlencode($filename);

$encoded_filename = str_replace(“+”, “%20”, $encoded_filename);

if (preg_match(“/MSIE/”, $ua)) {

header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');

} else if (preg_match(“/Firefox/”, $ua)) {

header("Content-Disposition: attachment; filename*="utf8''" . $filename . '"');

} else {

header('Content-Disposition: attachment; filename="' . $filename . '"');

}

header('Content-Disposition: attachment; filename="' . $filename . '"');

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

readfile($file);

When outputting, if it is Apache + PHP mod, it also needs to be sent to the output buffer of Apache. Finally it is sent to the user. For Nginx + fpm, if they are deployed separately, it will also bring additional network IO.

Today, I saw an interesting article: How I PHP: X-SendFile.

We can use Apache's module mod_xsendfile to let Apache send this file directly to the user:

$file = "/tmp/中文名.tar.gz";

$filename = basename($file);

header("Content-type: application/octet-stream");

//Process Chinese file names

$ua = $_SERVER["HTTP_USER_AGENT"];

$encoded_filename = urlencode($filename);

$encoded_filename = str_replace(“+”, “%20”, $encoded_filename);

if (preg_match(“/MSIE/”, $ua)) {

header('Content-Disposition: attachment; filename="' . $encoded_filename . '"');

} else if (preg_match(“/Firefox/”, $ua)) {

header("Content-Disposition: attachment; filename*="utf8''" . $filename . '"');

} else {

header('Content-Disposition: attachment; filename="' . $filename . '"');

}

header('Content-Disposition: attachment; filename="' . basename($file) . '"');

//Let Xsendfile send the file

header("X-Sendfile: $file");