php 下载预览pdf 文件名是中文

方式1

域名+文件路径

文件名需要处理特殊字符，要不然不能访问

方式 2

 1.手机下载预览pdf

2.文件名是中文

    public function downPdf(){
        $info=[];
        $file = $_SERVER['DOCUMENT_ROOT'].$info['pdf'];
        $filename = $info['pdf_title'];

        header("Content-type: application/octet-stream");

        //处理中文文件名
        $ua = $_SERVER["HTTP_USER_AGENT"];
        $encoded_filename = urlencode($filename);
        $encoded_filename = str_replace("+", "%20", $encoded_filename);
        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-Disposition: attachment; filename="' . $filename . '"');
        header("Content-Length: ". filesize($file));
        readfile($file);
        exit();
    }

参考：

https://www.php.cn/php-notebook-79535.html

http://www.thinkphp.cn/topic/66118.html