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<?
protected function getTree()
{
    $tree = [];
    foreach ($this->data as $id=>&$node) {
        if (empty($node['parent_id'])) {
            $tree[$id] = &$node;
        } else {
            $this->data[$node['parent_id']]['childs'][$id] = &$node;
        }
    }
    return $tree;
}