All textbooks, articles, manuals say - do not reinvent the wheel, use ready-made solutions ..
This is the question - what are the proven solutions?
The site is written in PHP + MYSQL.
We need the following functionality: - registration; - authorization; - password recovery; - (preferably) the ability to create user groups.
I would like with sensible documentation ...
PS The site is quite small .. Practically for myself and friends .. I see no reason to pull the framework for this