public function addServers(array $servers)
    {
        if (count($servers) == 0) {
            return false;
        }

        foreach ($servers as $ip => $port) {
            if (intval($port) == 0) {
                $port = null;
            }

            if ($this->probeServer($ip, $port)) {
                $status = $this->addServer($ip, $port);
                $this->safe = true;
            }
        }
    }