The break is irrelevant here because return already ends the function's execution.

clevier

The description should mention that the expected return values are all in lowercase. In fact, the whole description could use a facelift. Here's a quick suggestion:

"This Kata is meant for beginners.

You are given a number between 1-12 and you have to return name of the corresponding month in lowercase.

The input will always be valid.

Example:"

You can easily ommit a break (or any other code) after a return statement

Comparing values is neither novel nor interesting idea.

Comparing values is not a novel or interesting idea.

Fixed.

Python translation. Have slightly improved description, contains 50 random tests

php does not care

Thats right

The /../ part of the code represents a Regular Expression (RegEx) that looks for any 2 types of characters. If the length is even, When it comes time to check for the last character (i.e. the underscore) it will not be able to find another character after it, and thus won't add it to the resulting array.

I get confused when the string is even, why the match method doesn't match the underscore character?

It is not returning a string :P

Your solution is faster but eats a lot of memory. At sandbox.onlinephpfunctions.com your solution with n = 5000000 runs of ouf memory.