That's the title of the original question I had, but instead a more general question arise:
How can I find this sort of information without having to look at the .c source code?
I couldn't find any way of getting that information without looking here: https://github.com/phalcon/cphalcon/blob/1.3.0/ext/cache/frontend/data.c
and if I understand correctly the code, the only options available is the lifetime option.
I think that that kind of information should be easily available in the official documentation or api documentats without having to go to the source code, and maybe I missed it somewhere.
So the questions are:
1) Did I? Is the information somewhere I couldn't find apart from the .c code?
2) Is lifetime the only option available?