getValue() protected abstract method
Retrieves a value from cache with a specified key. This method should be implemented by child classes to retrieve the data from specific cache storage.
protected abstract mixed|false getValue ( $key )$key string
A unique key identifying the cached value return mixed|false
The value stored in cache, false if the value is not in the cache or expired. Most often value is a string. If you have disabled $serializer, it could be something else.