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）。

这个问题是在使用时遇到的，：

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 ");    }