Msieprawski\ResourceTable\Generators\Collection::sort PHP Method

    public function sort($index, $direction)
    {
        if (!in_array($direction, ['ASC', 'DESC'])) {
            throw new CollectionException('Sort direction must be ASC or DESC.');
        }
        $this->_sort = ['index' => $index, 'dir' => $direction];
        return $this;
    }