跨浏览器下PHP下载文件名中的中文乱码问题的解决方法

$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: 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';
?>

上面是一个比较通用的解决方案（据说xp+IE7会有问题，未验证）。

这个问题是在使用CI-Excel-Generation-Library时遇到的，解决办法：

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 ");
   }
?>