作者:白狼 出处:http://www.manks.top/php_tree_deep.html 本文版权归作者,欢迎转载,但未经作者同意必须保留此段声明,且在文章页面明显位置给出原文连接,否则保留追究法律责任的权利。原文有图片。
平时开发中或多或少不可避免会遇到无限极分类的问题,因为效率、逻辑等问题也一直使这类问题比较尖锐。今天我们以yii2框架为基础,栏目无限极为例,对这个问题进行一个简单的处理。
首先我们有一张栏目数据表 tree
表结构如下图(原文有图)
看上去表结构很简单。
我们插入几条测试数据
INSERT INTO `tree` (`id`, `parent_id`, `name`) VALUES (1, 0, 'A'), (2, 0, 'B'), (3, 1, 'a'), (4, 3, 'aa'), (5, 2, 'b'), (6, 4, 'aaa');
树形结构大致如下
|A |--a |----aa |------aaa |B |--b
这也正是我们所需要的数据结构形式,下面我们来看看如何处理才能够得到所需要的结果。
我们前面也说了,以yii2为基础,因此我们的写法也按照面向对象的规则来

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