• fixed the order of expected and actual

• fixed by upgrading to PHP 8.0

  • root cause of the issue: the reference solution used usort

  the manual says:

  If two members compare as equal, they retain their original order. Prior to PHP 8.0.0, their relative order in the sorted array was undefined.

language PHP 7.0

$this->assertEquals(last($string), $answer);

• expected and actual mixed up positions.

• If two words have the same last letter, they returned array should show them in the order they appeared in the given string.
  thats wrong to!

Input string:
uvrov kltfopf erzf ixdm

Failed asserting that two arrays are equal.
Actual: Array (
    0 => 'kltfopf'
    1 => 'erzf'
    2 => 'ixdm'
    3 => 'uvrov'
)
Expected: Array (
    0 => 'erzf'
    1 => 'kltfopf'
    2 => 'ixdm'
    3 => 'uvrov'
)