MVC -（一）

作业内容：将MVC3目录中的内容,按自己理解再写一遍

//入口文件
<?php
namespace hw;
require __DIR__ . '/Model.php';
require __DIR__ . '/View.php';
require __DIR__ . '/Controller.php';
$m = (new Model('mysql:dbname=testsql','zolo','123456'));
$v = new View();
echo (new Controller($m,$v))->index();
//controller
<?php
namespace hw;
class Controller{
    protected $model;
    protected $view;
    public function __construct($model,$view)
    {
        $this->model = $model;
        $this->view = $view;
    }
    public function index(){
        $data = $this->model->selectAll(15);
        $this->view->display($data);
    }
}
//model
<?php
namespace hw;
use PDO;
class Model{
    protected $db;
    public function __construct($dsn,$username,$password){
        $this->db = new PDO($dsn,$username,$password);
    }
    public function selectAll($argc){
        //字符串转数字
        $num = number_format($argc);
        $s = $this->db->prepare("select * from `users` limit $num");
        $s->execute();
        return $s->fetchAll();
    }
}
// $m = (new Model('mysql:dbname=testsql','zolo','123456'))->selectAll(5);
// print_r($m);
//view
<?php
namespace hw;
class View{
    public function display($argc){
        // 1. 模型赋值
        $users = $argc;
        // 2. 渲染模型
        include 'show.php';
    }
}