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$ua = $_SERVER["HTTP_USER_AGENT"];
$filename = "中文 文件名.txt";
$encoded_filename = urlencode($filename);
$encoded_filename = str_replace("+", "%20", $encoded_filename);
header('Content-Type: application/octet-stream');
if (preg_match("/MSIE/", $ua)) {
header('Content-Disposition: p_w_upload; filename="' . $encoded_filename . '"');
} else if (preg_match("/Firefox/", $ua)) {
header('Content-Disposition: p_w_upload; filename*="utf8\'\'' . $filename . '"');
} else {
header('Content-Disposition: p_w_upload; filename="' . $filename . '"');
}
print 'ABC';