无限极分类

//栏目无限极分类
    public function getTree($arr,$id = 0,$lev = 0){
        //存放结果数组
        $tree = array();
        //遍历栏目信息
        foreach($arr as $v){
            if($v[‘parent_id‘] == $id){
                $v[‘lev‘] = $lev;
                $tree[] = $v;
                $tree = array_merge($tree,$this->getTree($arr,$v[‘cat_id‘],$lev + 1));
            }
        }
        
        //返回结果
        return $tree;
    }