public function createService(ServiceLocatorInterface $viewHelperManager)
    {
        $serviceLocator = $viewHelperManager->getServiceLocator();
        $config = $serviceLocator->has('config') ? $serviceLocator->get('config') : array();
        if (isset($config['google_analytics'])) {
            $this->config($config['google_analytics']);
        }
    
        return $this;
    }