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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
This is deliberately overkill; it's an explanation of available OOP class features with scoping.
Even with simple code, best practices can still be applied to it; not introducing side-effects, type hinting, and so on.
Odd; I explicitly clicked on 'suggestion'.
It would be a good idea to stick to PSR-2 for conventions in here, and add namespacing.