/** * Perform upgrade routine if necessary. * * @return void * @access private * @since 1.0.0 */ private function maybe_upgrade() { $db_version = get_option('charitable_version'); if ($db_version !== self::VERSION) { require_once $this->get_path('includes') . 'class-charitable-upgrade.php'; Charitable_Upgrade::upgrade_from($db_version, self::VERSION); } }