/*socket收发数据     @host(string) socket服务器IP     @post(int) 端口     @str(string) 要发送的数据     @back 1|0 socket端是否有数据返回     返回true|false|服务端数据 */ function sendSocketMsg($host,$port,$str,$back=0){         $socket = socket_create(AF_INET,SOCK_STREAM,0);         if ($socket < 0) return false;         $result = @socket_connect($socket,$host,$port);         if ($result == false)return false;         socket_write($socket,$str,strlen($str));         if($back!=0){             $input = socket_read($socket,1024);             socket_close ($socket);                 return $input;         }else{             socket_close ($socket);                 return true;             }     }