怎么伪HTTP头文件？

        $header = array('Cache-Control: no-cache');

        $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, $url);

        curl_setopt($ch, CURLOPT_HEADER, 0);

        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);

        curl_setopt($ch, CURLOPT_HTTPHEADER, $header); //伪header信息

        curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; .NET CLR 1.1.4322; .NET CLR 2.0.50727)'); //伪浏览器信息

        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);

        curl_setopt($ch, CURLOPT_TIMEOUT, 30);

        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

        $rt = curl_exec($ch);

        curl_close($ch);