tp6无限极分类的查询

$cats = Db::name('cat')->select()->toArray();
		$cats = tree($cats);

function tree($data,$pid=0,$level=0){

		static $arr = [];
		foreach($data as $k=>$v){
			if($v['pid']==$pid){
				$v['cat_name'] = str_repeat('|----',$level).$v['cat_name'];
				$arr[] = $v;
				unset($data[$k]);
				tree($data,$v['id'],$level+1);
			}
		}
		return $arr;
		
	}

-- phpMyAdmin SQL Dump
-- version 4.8.5
-- https://www.phpmyadmin.net/
--
-- 主机： localhost
-- 生成日期： 2022-05-23 18:02:43
-- 服务器版本： 5.7.26
-- PHP 版本： 7.3.4

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
SET AUTOCOMMIT = 0;
START TRANSACTION;
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- 数据库： `kkk`
--

-- --------------------------------------------------------

--
-- 表的结构 `cat`
--

CREATE TABLE `cat` (
  `id` int(10) UNSIGNED NOT NULL,
  `pid` int(10) UNSIGNED NOT NULL,
  `cat_name` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
  `cat_img` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
  `is_show` tinyint(4) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

--
-- 转存表中的数据 `cat`
--

INSERT INTO `cat` (`id`, `pid`, `cat_name`, `cat_img`, `is_show`) VALUES
(1, 0, '手机', '/storage/category/bc\\91231321a92a7a6a6db99fa7db8f37.png', 1),
(7, 0, '厨具', '/storage/category/01\\c7232eb931fa3dd40f8b4946bd27fa.jpg', 1),
(8, 7, '电饭锅', '/storage/category/2b\\edd18255c4efcfc4a9982ce33671be.jpg', 1),
(9, 0, '服装', '/storage/category/f6\\655e2bed6b7bea027fb69a3c11a27c.jpg', 1),
(10, 9, '女装', '/storage/category/84\\f9e13fa3a6093990bf3de4e2da74a0.jpg', 1),
(11, 1, '华为', '/storage/category/b4\\a403d9874ed426bd5210a2f42c33f0.jpg', 1);

--
-- 转储表的索引
--

--
-- 表的索引 `cat`
--
ALTER TABLE `cat`
  ADD PRIMARY KEY (`id`);

--
-- 在导出的表使用AUTO_INCREMENT
--

--
-- 使用表AUTO_INCREMENT `cat`
--
ALTER TABLE `cat`
  MODIFY `id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=12;
COMMIT;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;