php 下载文件

    public function test(){
         $file_name ='/Upload/a1.html';
         $filePath = $_SERVER['DOCUMENT_ROOT'].$file_name;
            
            $out_filename = '附件'.'.'.end(explode('.', $file_name));
            file_down($filePath, $file_name,$out_filename);

            
            header('Accept-Ranges: bytes');
            header('Accept-Length: ' . filesize($filePath));
            header('Content-Transfer-Encoding: binary');
            header('Content-type: application/octet-stream');
            header('Content-Disposition: attachment; filename=' . $out_filename);
            header('Content-Type: application/octet-stream; name=' . $out_filename);

            if(is_file($filename) && is_readable($filename)){
                $file = fopen($filename, "r");
                echo fread($file, filesize($filename));
                fclose($file);
            }
    }

    // 生成快捷方式  可以通下载特定html 文件 当做网站 快捷方式 
    public function  kjfs(){
        $filename = "/Upload/test.html";
        header("Content-Type: application/force-download");
        header("Content-Disposition: attachment; filename=".$filename);

        readfile($filename); 
    }