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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.
Perhaps you are trying to get length of an array in JS style which doesn't work in PHP. It should be
count($arr). Or, if you trying to get length of string it also should be done in other way which isstrlen($string)Genius!