if (!function_exists('get_cate_list')) {
    //递归函数 实现无限级分类列表
    function get_cate_list($list,$pid=0,$level=0) {
        static $tree = array();
        foreach($list as $row) {
            if($row['pid']==$pid) {
                $row['level'] = $level;
                $tree[] = $row;
                get_cate_list($list, $row['id'], $level + 1);
            }
        }
        return $tree;
    }
}

function  getCate($list,$pid=0,$level=0){
    static $tree = array();
    foreach ($list as $row){
        if($row['pid'] == $pid){
            $row['level'] =  $level;
            $tree[] = $row;
            getCate($list,$row['id'],$level+1);

        }
    }
    return $tree;
}

if(!function_exists('get_tree_list')){
    //引用方式实现 父子级树状结构
    function get_tree_list($list){
        //将每条数据中的id值作为其下标
        $temp = [];
        foreach($list as $v){
            $v['son'] = [];
            $temp[$v['id']] = $v;
        }
        //获取分类树
        foreach($temp as $k=>$v){
            $temp[$v['pid']]['son'][] = &$temp[$v['id']];
        }
        return isset($temp[0]['son']) ? $temp[0]['son'] : [];
    }
}