无限极分类生成

public function getCateTree()
    {
        $list = [];
        $data = $this->select();
        $list = $this->getTree($data);
        return $list;
    }
    public function getTree($data,$id=0,$level=1)
    {
        static $list = [];
        foreach($data as $key => $value){
            if($value['parent_id'] == $id){
                $value['level'] = $level;
                $list[] = $value;
                //$this->getTree($data);
                /*foreach($data as $k=>$v){
                    if($v['parent_id'] == $value['id']){
                        $list[] = $v;
                    }
                }*/
                $this->getTree($data,$value['id'],$level+1);
            }
        }
        return $list;
    }

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