think\Collection::sort PHP 메소드

    public function sort(callable $callback = null)
    {
        $items = $this->items;
        $callback ? uasort($items, $callback) : uasort($items, function ($a, $b) {
            if ($a == $b) {
                return 0;
            }
            return $a < $b ? -1 : 1;
        });
        return new static($items);
    }