Solution to the problem of Chinese garbled characters in PHP download file names under cross-browser

$ua = $_SERVER["HTTP_USER_AGENT"];
$filename = "Chinese file name.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: attachment; filename="' . $encoded_filename . '"');
 } else if (preg_match("/Firefox/", $ua)) {
 header('Content-Disposition: attachment; filename*="utf8''' . $filename . '"');
} else {
 header ('Content-Disposition: attachment; filename="' . $filename . '"');
}
print 'ABC';
?>

The above is a more general solution (it is said that xp+IE7 will have problems, but it has not been verified).

This problem was encountered when using CI-Excel-Generation-Library. The solution:

private function set_headers() {
 $ua = $_SERVER["HTTP_USER_AGENT"];
 $filename = $this->filename . ".xls";
 $encoded_filename = urlencode($filename);
 $encoded_filename = str_replace("+", "%20", $encoded_filename);
 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-Type: application/octet-stream");
 //header("Content-Type: application/vnd.ms-excel;charset=UTF-8") ;
 header("Content-Type: application/download");;
 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-Transfer-Encoding: binary ");
 }
?>< ;/p>