It shouldn't work with floats. If floats ar needed return must be changed from int to float

This won't work with floats..

WoW

If you have set declare(strict_types=1); php would throw an error (because you try to return string as int), if this declaration is missing it will convert string to int.

Brilliant

It's decision with mistake, because it only subtracts one minimum and maximum element. And if you have two minimal elements, for example in the array [1,1, 2, 10,11] the program will take only one minimal element from the final result

It's been approved by someone it seems.

Not a kata issue.

php kata description is square?

It should be pow??

Thank you!!

Fixed that. Actual and expected were also swapped (fixed that too).

php function params sperm no '$'?

As the input may have trailing spaces, you will also need to ignore unneccesary whitespace.

string not trim()?