alcaeus / mongo-php-adapter

    /**

     * @return \MongoDB\Database

     */

    private function createDatabaseObject()

    {

        $options = [

            'readPreference' => $this->readPreference,

            'writeConcern' => $this->writeConcern,

        ];

        if ($this->db === null) {

            $this->db = $this->connection->getClient()->selectDatabase($this->name, $options);

        } else {

            $this->db = $this->db->withOptions($options);

        }

    }

}

    /**

     * @return \MongoDB\Collection

     */

    private function createCollectionObject()

    {

        $options = [

            'readPreference' => $this->readPreference,

            'writeConcern' => $this->writeConcern,

        ];

        if ($this->collection === null) {

            $this->collection = $this->db->getDb()->selectCollection($this->name, $options);

        } else {

            $this->collection = $this->collection->withOptions($options);

        }

    }

}