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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.
It is not the kata fault if bcmul and others are not at CW. You can do without them. If you want this package you can ask CW reporting a bug and asking for it. Maybe you will receive a satisfying answer. Who knows? You can also see: https://github.com/Codewars/codewars.com/wiki/Language-PHP.