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深入浅析PHP无限极分类的案例教程,浅析php案例教程
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深入浅析PHP无限极分类的案例教程,浅析php案例教程

Jun 13, 2016 am 08:40 AM
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深入浅析PHP无限极分类的案例教程,浅析php案例教程

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');
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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

class tree { 
//访问index查看树形结构 
public function actionIndex () { 
$data = self::getTree(); 
//为了方便测试,我们这里以json格式输出 
\Yii::$app->response->format = \yii\web\Response::FORMAT_JSON; 
return $data; 
} 
//获取树 
public static function getTree () { 
//这里我们直接获取所有的数据,然后通过程序进行处理 
//在无限极分类中最忌讳的是对数据库进行层层操作,也就很容易造成内存溢出 
//最后电脑死机的结果 
$data = static::find()->all(); 
return self::_generateTree($data); 
} 
//生成树 
private static function _generateTree ($data, $pid = 0) { 
$tree = []; 
if ($data && is_array($data)) { 
foreach($data as $v) { 
if($v['parent_id'] == $pid) { 
$tree[] = [ 
'id' => $v['id'], 
'name' => $v['name'], 
'parent_id' => $v['parent_id'], 
'children' => self::_generateTree($data, $v['id']), 
]; 
} 
} 
} 
return $tree; 
} 
}
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我们访问下tree/index看看,效果图如下

这样我们可以看到一个很清晰的树形结构图,也就是我们最终所需要的。

关于PHP无限极分类的案例教程就给大家介绍这么多,希望对大家有所帮助!

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