How "1" works though?

Good job. Thank you.

Haskell translation

Ah, another shorter version of mine. Very good.

They write return the expectation , but they themselves do not read out the solution of the problem with them, ingeniously

I like this one better than my own solution.

heh... yeah, good one!

I came up with a similar solution but did not put the second arguments in quotes. Is there practical difference?

I'd say they do the same thing but some browsers don't run like it is**

very nice, equal

Love solutions like this. Clever without being hard to parse. Well done!

Thanks for publishing this challenge, useful PHP kata by the way, many congratulations.