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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.
Changing the name will invalidate over 10_000 solutions, so it would be good if you added some backwards compatibility to handle the old name too. Also, if you are going to change the name, you might as well switch to snake_case, as is standard for Python.
No, that's a problem with your code, not a kata issue. Read this: https://www.php.net/manual/en/function.array-search.php