defaultCollection example

            $option = isset($matches['options']) ? '?'.$matches['options'] : '';
            $connectionString = $protocol.'://'.implode(',', $newServers).$option;

            $clusterOptions = new ClusterOptions();
            $clusterOptions->credentials($username, $password);

            $client = new Cluster($connectionString, $clusterOptions);

            $bucket = $client->bucket($matches['bucketName']);
            $collection = $bucket->defaultCollection();
            if (!empty($matches['scopeName'])) {
                $scope = $bucket->scope($matches['scopeName']);
                $collection = $scope->collection($matches['collectionName']);
            }

            return $collection;
        } finally {
            restore_error_handler();
        }
    }