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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.
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In PHP, you don't need to group the if parameters into groups with the &&. PHP does get lazy in that once it encounters a false for one, it will skip the rest.
not bad. probably don't want to implode the array with each check