求帮忙修改个php curl模拟post请求内容后并下载文件的解决思路

下面代码使用curl模拟post请求链接后直接显示出了文件内容，如何修改成不显示内容而直接下载请求到的.torrent格式文件呢

    function curl_post($header,$data,$url)
    {
     $ch = curl_init();
     $res= curl_setopt ($ch, CURLOPT_URL,$url);
     curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
     curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
     curl_setopt ($ch, CURLOPT_HEADER, 0);
     curl_setopt($ch, CURLOPT_POST, 1);
     curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
     curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
     curl_setopt($ch,CURLOPT_HTTPHEADER,$header);
     $result = curl_exec ($ch);
     curl_close($ch);
     if ($result == NULL) {
     return 0;
     }
     return $result;
    } 
     $url = 'http://www.bttiantang.com/download4.php' ; 
     $header = array("Host:www.bttiantang.com",
     "Content-Type:application/x-www-form-urlencoded",
     'User-Agent: Mozilla/4.0 (compatible; MSIE .0; Windows NT 6.1; Trident/4.0; SLCC2;)'); 
    $data = 'action=download&id;=26881&uhash;=eecf3d3071a7b672c314bc39';
    $ret = curl_post($header, $data,$url);
    //需将内容显示修改为文件下载
    echo $ret;

------解决思路----------------------

不要echo $ret;

把$ret写入文件中去。保存起来

------解决思路----------------------

    $ret = curl_post($header, $data,$url);
    //需将内容显示修改为文件下载
    $filename = 'x.torrent';
    header("Content-Type: application/force-download");
    header("Content-Disposition: attachment; filename=$filename"); 
    echo $ret;

下载的 x.torrent 用迅雷打开为

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