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\r\n";
         $header .= "Host: ". $url_array['host'] . "\r\n"; //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\r\n";//POST数据
                 $header   .= "Content-Length: ". strlen($_post) ." \r\n";//POST数据的长度
                 $header      .= "Connection:Close\r\n\r\n";

                 $header .= $_post."\r\n\r\n "; //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;
 }