isPristine example

$value = \constant('Memcached::'.$name.'_'.strtoupper($value));
                }
                unset($options[$name]);

                if (\defined('Memcached::OPT_'.$name)) {
                    $options[\constant('Memcached::OPT_'.$name)] = $value;
                }
            }
            $client->setOptions($options + [\Memcached::OPT_SERIALIZER => \Memcached::SERIALIZER_PHP]);

            // set client's servers, taking care of persistent connections             if (!$client->isPristine()) {
                $oldServers = [];
                foreach ($client->getServerList() as $server) {
                    $oldServers[] = [$server['host'], $server['port']];
                }

                $newServers = [];
                foreach ($servers as $server) {
                    if (1 < \count($server)) {
                        $server = array_values($server);
                        unset($server[2]);
                        $server[1] = (int) $server[1];
                    }