Hi! Thanks for the feedback. This is my first kata, so I’m still learning. Could you give me some tips on adding sample and random tests?

accessing undeclared variables raises a warning from PHP 8 onwards, and the Codewars PHP runner treats warnings as errors and aborts execution. this solution was relying on the facts that 1) undeclared variables have a default value of null and 2) null concatenated to a string acts as an empty string (!)

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Thanks for the heads-up! You’re right that under this kata’s rules (ASCII letters only, case-insensitive, empty → false), “xgx” is a palindrome.

I’ve:

• Clarified the description to state that single-letter results do count as palindromes.
• Updated the tests: the case for "xgx" now expects true, added a contrasting "xgy" => false, and expanded samples/hidden tests accordingly.

Please give it another try with the updated tests. If anything still looks off, ping me and I’ll adjust fast.

thank you for your response! i will work a little bit more on that kata :) i hope you enjoyed it anyway

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Specified in test cases

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We don't have to worry about state, the star is used correctly here, if I understand what your concern is

It was supposed to be "state", not "rule". Changed to state. Given that the 3 things listed are clearly not states, this is not confusing anymore.

Different rules.

Turing machines have multiples states, all of which can have different rules that are a combination of the three rules as in this kata.

Maybe call them "state rule sets"?

there's effectively one rule. so do we need to worry about rules, or not? I honestly don't have an answer.

I changed the description so it now tells you which sybols are allowed.