public static function enablePdoConnection()
    {
        if (is_null(self::$instance)) {
            global $wpdb;

            $capsule = new self();
            $capsule->addConnection([
                'driver'    => 'mysql',
                'host'      => DB_HOST,
                'database'  => DB_NAME,
                'username'  => DB_USER,
                'password'  => DB_PASSWORD,
                'charset'   => 'utf8mb4',
                'collation' => 'utf8mb4_general_ci',
            ]);
            $capsule->setAsGlobal();
            $capsule->bootEloquent();
        }
    }