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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.
I understand your point, but it does not seem to be official PHP terminology. Browsing the official documentation for anonymous functions, one can read sentences such as:
The whole document uses the terms "anonymous function" and "closure" interchangeably
can you write an anonymous function for which
instanceof Closureyieldsfalse?