src/Primitive/Support/Traits/SliceableTrait.php
protected function getIndices($start, $stop, $step)
    {
        $indices = [];

        if ($step > 0)
        {
            for ($i = $start; $i < $stop; $i += $step)
            {
                $indices[] = $i;
            }
        }
        else
        {
            for ($i = $start; $i > $stop; $i += $step)
            {
                $indices[] = $i;
            }
        }

        return $indices;
    }
protected function getIndices($start, $stop, $step)
    {
        $indices = [];

        if ($step > 0)
        {
            for ($i = $start; $i < $stop; $i += $step)
            {
                $indices[] = $i;
            }
        }
        else
        {
            for ($i = $start; $i > $stop; $i += $step)
            {
                $indices[] = $i;
            }
        }

        return $indices;
    }
Returns an array of indices to be included in the slice.

@param int $start Start index of the slice
@param int $stop  Boundary for the slice
@param int $step  Rate at which to include characters

@return array An array of indices in the string