php下载文件的代码_知识百科

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 public function down()    {        header('content-type:application:json;charset=utf8');        header('Access-Control-Allow-Origin:https://coucouchina.com');        header('Access-Control-Allow-Methods:POST');        header('Access-Control-Allow-Headers:x-requested-with,content-type');        header("Content-type:text/html;charset=utf-8");// $file_name="cookie.jpg";        $file_name = "apple-app-site-association";//用以解决中文不能显示出来的问题        $file_name = iconv("utf-8", "gb2312", $file_name);        $file_sub_path = $_SERVER['DOCUMENT_ROOT'] . "/";                $file_path = $file_sub_path . $file_name;//首先要判断给定的文件存在与否        if (!file_exists($file_path)) {            echo "没有该文件文件";            return;        }        $fp = fopen($file_path, "r");        $file_size = filesize($file_path);//下载文件需要用到的头        Header("Content-type: application/octet-stream");        Header("Accept-Ranges: bytes");        Header("Accept-Length:" . $file_size);        Header("Content-Disposition: attachment; filename=" . $file_name);        $buffer = 1024;        $file_count = 0;//向浏览器返回数据        while (!feof($fp) && $file_count < $file_size) {                    $file_con = fread($fp, $buffer);                    $file_count += $buffer;                    echo $file_con;        }        fclose($fp);    }