Baum\SetValidator::groupRootsByScope PHP Метод

    protected function groupRootsByScope($roots)
    {
        $rootsGroupedByScope = [];
        foreach ($roots as $root) {
            $key = $this->keyForScope($root);
            if (!isset($rootsGroupedByScope[$key])) {
                $rootsGroupedByScope[$key] = [];
            }
            $rootsGroupedByScope[$key][] = $root;
        }
        return $rootsGroupedByScope;
    }