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前言

模块的功能通常在控制器中实现。

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1.创建自定义控制器

StudentController.php：

<?php

/**
 * 学生模块控制器类
 * 模块管理一般有：CURD增删改查
 * 模型根据数据表创建，控制器根据模块创建
 * 通常一个控制器完成一个模块的功能
 * Class StudentController
 */
class StudentController
{
    /**
     * 获取所有数据
     * @return mixed
     */
    public function listAll()
    {
        // 实例化模型，获取数据
        $stu = new StudentModel();
        $data = $stu->getAll();
        // 格式化
        echo '<pre>';
        print_r($data);
    }

    /**
     * 获取单条数据
     * @return mixed
     */
    public function info($id=1)
    {
        $id = isset($_GET['id']) ? $_GET['id'] : $id;
        // 实例化模型，获取数据
        $stu = new StudentModel();
        $data = $stu->get($id);
        // 格式化
        echo '<pre>';
        print_r($data);
        //return $data;
    }
}

2.创建前端控制器实现请求分发

项目目录结构如下：

index.php：

<?php
/**
 * 前端控制器，入口文件功能，请求分发器
 */

// 加载模型类
require_once 'model/Db.php';
require_once 'model/Model.php';
require_once 'model/StudentModel.php';

// 判断当前url中是否有c：controller
$controller = isset($_GET['c']) ? $_GET['c'] : 'Student';
// 给控制器添加后缀
$controller .= 'Controller';

// 加载控制器类
require_once 'controller/'.$controller.'.php';
// 获取方法
$action = isset($_GET['a']) ? $_GET['a'] : 'listAll';

// 实例化自定义控制器类
$stu = new $controller();

$stu->$action(); // 根据学生id，默认为1
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3.控制器功能测试

查询所有数据：http://localhost/php.cn/mvc/

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => 郭靖
            [email] => guojing@php.cn
            [course] => php
            [grade] => 80
            [create_time] => 1505054471
            [update_time] => 1505054471
        )

    [1] => Array
        (
            [id] => 2
            [name] => 黄蓉
            [email] => huangrong@php.cn
            [course] => mysql
            [grade] => 88
            [create_time] => 1505054471
            [update_time] => 1505054471
        )

    [2] => Array
        (
            [id] => 3
            [name] => 杨康
            [email] => yangkang@php.cn
            [course] => mysql
            [grade] => 67
            [create_time] => 1505054471
            [update_time] => 1505054471
        )

    [3] => Array
        (
            [id] => 4
            [name] => 洪七
            [email] => hongqi@php.cn
            [course] => php
            [grade] => 35
            [create_time] => 1505054471
            [update_time] => 1505054471
        )

    [4] => Array
        (
            [id] => 5
            [name] => 老顽童
            [email] => laowantong@php.cn
            [course] => html
            [grade] => 78
            [create_time] => 1505054471
            [update_time] => 1505054471
        )

    [5] => Array
        (
            [id] => 6
            [name] => 欧阳峰
            [email] => ouyangfeng@php.cn
            [course] => mysql
            [grade] => 56
            [create_time] => 1505054471
            [update_time] => 1505054471
        )

    [6] => Array
        (
            [id] => 7
            [name] => 杨过
            [email] => yangguo@php.cn
            [course] => php
            [grade] => 99
            [create_time] => 1505054471
            [update_time] => 1505054471
        )

    [7] => Array
        (
            [id] => 8
            [name] => 小龙女
            [email] => xiaolongnv@php.cn
            [course] => html
            [grade] => 80
            [create_time] => 1505054471
            [update_time] => 1505054471
        )

    [8] => Array
        (
            [id] => 9
            [name] => 张无忌
            [email] => zhangwuji@php.cn
            [course] => mysql
            [grade] => 63
            [create_time] => 1505054471
            [update_time] => 1505054471
        )

    [9] => Array
        (
            [id] => 10
            [name] => 赵敏
            [email] => zhaomin@php.cn
            [course] => php
            [grade] => 80
            [create_time] => 1505054471
            [update_time] => 1505722385
        )

)
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查询单条数据：http://localhost/php.cn/mvc/?a=info&id=9

Array
(
    [id] => 9
    [name] => 张无忌
    [email] => zhangwuji@php.cn
    [course] => mysql
    [grade] => 63
    [create_time] => 1505054471
    [update_time] => 1505054471
)
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往期文章

• 《php从零开始开发属于自己的php框架》课程笔记1——MVC与单例模式
• 《php从零开始开发属于自己的php框架》课程笔记2——数据库与模型