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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.
The site throws an error about the mb_strlen function not existing (http://php.net/manual/en/function.mb-strlen.php).
If you just use strlen then if the string includes any multibyte characters your program won't work.
It's really limited to assume that people visiting your website only come from America and only use latin characters.