注意数组里面需要包含 pid、level、id这几个字段

/**
 * 无限极分类列表
 */
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 $tree = array();//静态不会在递归的时候重复创建，之创建一次
        foreach($list as $row) {
            if($row['pid']==$pid) {
                $row['level'] = $level;
                $tree[] = $row;
                get_cate_list($list, $row['id'], $level + 1);
            }
        }
        return $tree;
    }
}

查询结果如下：

{
    "code": 200,
    "msg": "success",
    "data": [
        {
            "id": 1,
            "auth_name": "首页",
            "pid": 0,
            "pid_path": "0",
            "auth_c": "",
            "auth_a": "",
            "is_nav": 1,
            "level": 0
        },
        {
            "id": 90,
            "auth_name": "首页",
            "pid": 1,
            "pid_path": "0_1",
            "auth_c": "",
            "auth_a": "",
            "is_nav": 1,
            "level": 1
        },
        {
            "id": 91,
            "auth_name": "首页",
            "pid": 90,
            "pid_path": "0_1_90",
            "auth_c": "index",
            "auth_a": "index",
            "is_nav": 1,
            "level": 2
        },
        {
            "id": 104,
            "auth_name": "首页啊",
            "pid": 90,
            "pid_path": "0_1_90",
            "auth_c": "s",
            "auth_a": "y",
            "is_nav": 1,
            "level": 2
        }
    ]
}