Please read this: https://docs.codewars.com/training/troubleshooting/

Your function returns an array with an empty string, and the expected value is an empty array.

Failed asserting that two arrays are equal.

Expected: Array (
)

Actual : Array (
0 => ' '
)

Does anyone know what this means?

I tested my code in Visual Studio Code no problem, but when I tested it on the site this message appears.

Note: I used PHP 7.0