phpexcel导出到输出流的文件，如何兼容各个平台？

最近在做企微开发，碰到文件导出问题有点头疼，浏览器还好，但是碰到手机的话，就有很多问题，安卓微信里面直接打不开，苹果微信里面打开是空文件。下面是代码，downloadHeaders函数主要处理中文文件名问题

function downloadHeaders($filename, $charset = 'UTF-8')
{
    // 兼容各浏览器下载文件名乱码问题
    if (preg_match("/MSIE/", $_SERVER["HTTP_USER_AGENT"])) {
        $filename = urlencode($filename);
        $filename = str_replace("+", "%20", $filename);// 替换空格
        $attachment = "attachment; filename=\"{$filename}\"; charset={$charset}";
    } else if (preg_match("/Firefox/", $_SERVER["HTTP_USER_AGENT"])) {
        $attachment = 'attachment; filename*=utf-8\'\'' . $filename;
    } else if (preg_match("/(Safari)|(iphone)|(ipad)/i", $_SERVER["HTTP_USER_AGENT"])) {
        $filename = rawurlencode($filename); // 注意：rawurlencode与urlencode的区别
        $attachment = 'attachment; filename*=utf-8\'\'' . $filename;
    } else {
        $attachment = "attachment; filename=\"{$filename}\"; charset={$charset}";
    }

    return $attachment;
}



    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/vnd.ms-excel");
    header('Content-Type:application/octet-stream');
    header('Content-Type:application/download');
    header("Content-Disposition:" . downloadHeaders("测试.xlsx"));
    header('Content-Transfer-Encoding:binary');