php 通过浏览器直接下载 csv 格式文件

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<?php
    $file = 'Hello,World';

    $csv_data = mb_convert_encoding($file, "cp936", "UTF-8");
    $file_name =  time().'.csv';
    header("Content-type:text/csv;");
    header("Content-Disposition:attachment;filename=" . $file_name);
    header('Cache-Control:must-revalidate,post-check=0,pre-check=0');
    header('Expires:0');
    header('Pragma:public');
    echo $csv_data;
    ```