Own validation rules with CodeIgniter >4.5

Registrars are a bad idea. It works in a limited way and mostly with modules.

I would like to remind you that some people don't use anything: neither groups nor classes. They create them in controllers 

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You are wrong about $this‐>validator, the object will appear only after validation, so you can’t work with it before that.

Simple CI 4 project for beginners codeigniter-expenses ( topic )