Codeception\Module\WPBootstrapper::restoreWpdbConnection PHP Method

    private function restoreWpdbConnection()
    {
        if (!class_exists('wpdb')) {
            return;
        }
        /** @var \wpdb $wpdb */
        global $wpdb;
        if (empty($wpdb)) {
            $wpdb = new \wpdb(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST);
        } else {
            $wpdb->db_connect();
            $wpdb->check_connection();
        }
        /**
         * To avoid `mysqli_free_result` errors during the `wpdb::flush()` method set the result to `null`.
         * See `wp-db.php` file line 1425.
         */
        $reflection = new \ReflectionClass($wpdb);
        $resultProperty = $reflection->getProperty('result');
        $resultProperty->setAccessible(true);
        $resultProperty->setValue($wpdb, null);
        $resultProperty->setAccessible(false);
    }