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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 am very sorry but it is your code that causes a memory error... As you can see at the top of the page 209 guys out of a total of 3,357 passed the PHP kata.
Not a problem of the kata. Don't post an issue unless you are really sure of your code.