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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 just tried a few solutions and they worked fine. 239 guys passed the PHP kata as you could have seen at the top of the page. Maybe you should have a look at your code.
Please don't post issues unless you are sure of your code. You make the author lose honor:-(