fsocket发送post实现异步请求

function triggerRequest($url, $post_data = array(), $cookie = array()){
          //可以通过POST或者GET传递一些参数给要触发的脚本
        $url_array = parse_url($url); //获取URL信息，以便平凑HTTP HEADER
        $port = isset($url_array['port'])? $url_array['port'] : 80; 
      
        $fp = fsockopen($url_array['host'], $port, $errno, $errstr, 30); 
        if (!$fp){
                return FALSE;
        }

        $getPath = $url_array['path'];
        isset($url_array['query']) && $getPath.= "?". $url_array['query'];
        $method = empty($post_data) ? "GET":"POST";
  

        $header = $method . " " . $getPath;
        $header .= " HTTP/1.1
";
        $header .= "Host: ". $url_array['host'] . "
"; //HTTP 1.1 Host域不能省略

     
        if(!empty($post_data)){
                $_post = http_build_query($post_data);

                $header   .= "Content-Type: application/x-www-form-urlencoded
";//POST数据
                $header   .= "Content-Length: ". strlen($_post) ." 
";//POST数据的长度
                $header      .= "Connection:Close

";

                $header .= $_post."

 "; //传递POST数据
        }


        fwrite($fp, $header);
        //echo fread($fp, 1024); //我们不关心服务器返回
        fclose($fp);
        return true;
}