yii\mongodb\Connection::getDefaultDatabaseName PHP Méthode

    public function getDefaultDatabaseName()
    {
        if ($this->_defaultDatabaseName === null) {
            if (preg_match('/^mongodb:\\/\\/.+\\/([^?&]+)/s', $this->dsn, $matches)) {
                $this->_defaultDatabaseName = $matches[1];
            } else {
                throw new InvalidConfigException("Unable to determine default database name from dsn.");
            }
        }
        return $this->_defaultDatabaseName;
    }