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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