protected function mergeBackwardCompatibilityConfig(array $config, ContainerBuilder $container)
    {
        if ($container->hasParameter('cache_time_keeper.driver')) {
            $config['use_driver'] = $container->getParameter('cache_time_keeper.driver');
        }

        foreach (['fast', 'slow'] as $item) {
            if (empty($config['drivers']['multi'][$item]) &&
                $container->hasParameter('cache_time_keeper.driver.multi.'.$item)
            ) {
                $config['drivers']['multi'][$item] = $container->getParameter('cache_time_keeper.driver.multi.'.$item);
            }
        }

        return $config;
    }
protected function mergeBackwardCompatibilityConfig(array $config, ContainerBuilder $container)
    {
        if ($container->hasParameter('cache_time_keeper.driver')) {
            $config['use_driver'] = $container->getParameter('cache_time_keeper.driver');
        }

        foreach (['fast', 'slow'] as $item) {
            if (empty($config['drivers']['multi'][$item]) &&
                $container->hasParameter('cache_time_keeper.driver.multi.'.$item)
            ) {
                $config['drivers']['multi'][$item] = $container->getParameter('cache_time_keeper.driver.multi.'.$item);
            }
        }

        return $config;
    }
@param array $config
@param ContainerBuilder $container

@return array