codewars Kata get hard soon enough. maybe its because youre doing it in PHP but ive had no complaints at all on python and javascript.
agree with cag_ii that you should just work on projects given that you're keen on PHP
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It wasn't that they were too easy, too easy is fine. I'm doing this to understand where the good docs are, what error messages read like, and what the common mistakes and gotchas of the language will be. It's just like no one proofread some of these, repetitive concepts, one Kata had a blatantly wrong test condition, etc.
Reviewing commits on github will be useful in understanding what contributing to mature projects looks like though.
Codewars isn't being maintained very well. Some of the languages aren't current - their version of Elixir is over a year old, and they have no plans to upgrade it.