CI4 Validation - how use/work with calleble functions

Agreed - the tutorial does not appear to deal with custom validation rules

Not a full example, but https://codeigniter4.github.io/CodeIgnit...stom-rules

If I am understand right, that anonymous function was removed from validation library? And when i need to use ONE anonymous function in my rules (in my case) - i must create special custom class for that, which i registered in Config/Validation.php ? I think in this case it's not right way - create class for one rule...