###调用 return $this->getTreeData($list); ``` ~~~ protected function getTreeData($datalist, int $parentId = 0) { $data = []; foreach ($datalist as $key => $item) { if ($item['parent_id'] == $parentId) { $children = $this->getTreeData($datalist, (int)$item['id']); !empty($children) && $item['children'] = $children; $data[] = $item; unset($datalist[$key]); } } ~~~ ```