Lavary\Menu\Builder::sortBy PHP Метод

    public function sortBy($sort_by, $sort_type = 'asc')
    {
        if (is_callable($sort_by)) {
            $rslt = call_user_func($sort_by, $this->items->toArray());
            if (!is_array($rslt)) {
                $rslt = array($rslt);
            }
            $this->items = new Collection($rslt);
        }
        // running the sort proccess on the sortable items
        $this->items = $this->items->sort(function ($f, $s) use($sort_by, $sort_type) {
            $f = $f->{$sort_by};
            $s = $s->{$sort_by};
            if ($f == $s) {
                return 0;
            }
            if ($sort_type == 'asc') {
                return $f > $s ? 1 : -1;
            }
            return $f < $s ? 1 : -1;
        });
        return $this;
    }