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老师批语：
今天学习了设计模式与MVC初步的知识，
代码：
<?php
//单例模式：一个类只允许被实例化
class Config{
private static $instance=null;
private function __construct()
{
}
private function __clone()
{
// TODO: Implement __clone() method.
}
public static function getInstance(){
if(self::$instance==null){
self::$instance=new self();
}
return self::$instance;
}
}
$c1=Config::getInstance();
$c2=Config::getInstance();
var_dump($c1===$c2);点击 "运行实例" 按钮查看在线实例
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/9/10
* Time: 16:06
*/
namespace MVC\controller;
use MVC\model\Model;
use MVC\view\View;
class Controller
{
public function index()
{
require './model/Model.php';
$model = new Model('php', 'root', 'root');
$model->select('staff', 10);
$result = $model->result;
require './view/View.php';
$view = new View($result);
$data = $view->getData();
$view->display($data);
}
}点击 "运行实例" 按钮查看在线实例
<?php
//模型类
namespace MVC\model;
class Model
{
public $pdo = null;
//连接数据库
public $result = [];
public function __construct($dbname, $user, $pass)
{
$this->pdo = new \PDO('mysql:host=127.0.0.1;dbname='.$dbname, $user, $pass);
}
//查询
public function select($table, $num)
{
//创建预处理对象
$stmt = $this->pdo->prepare("SELECT `staff_id`,`name`,`age`,`salary` FROM {$table} LIMIT :num");
//执行查询
$stmt->bindValue(':num', $num, \PDO::PARAM_INT);
$stmt->execute();
$this->result = $stmt->fetchAll(\PDO::FETCH_ASSOC);
}
}点击 "运行实例" 按钮查看在线实例
<?php
/**
* Created by PhpStorm.
* User: Administrator
* Date: 2018/9/10
* Time: 16:00
*/
namespace MVC\view;
class View
{
public function __construct($data)
{
$this->data=$data;
}
public function getData(){
return $this->data;
}
public function display($data){
$table='<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
table,th,td {
border: 1px solid black;
}
table {
border-collapse: collapse; /*折叠表格线*/
width: 600px;
margin: 30px auto;
text-align: center;
padding: 5px;
}
table tr:first-child {
background-color: lightgreen;
}
table caption {
font-size: 1.5em;
margin-bottom: 15px;
}
</style>
</head>
<body>
<table>
<tr>
<th>ID</th>
<th>姓名</th>
<th>年龄</th>
<th>工资</th>
</tr>';
foreach ($data as $staff) {
$table .= '<tr>';
$table .= '<td>'.$staff['staff_id'].'</td>';
$table .= '<td>'.$staff['name'].'</td>';
$table .= '<td>'.$staff['age'].'</td>';
$table .= '<td>'.$staff['salary'].'</td>';
$table .= '</tr>';
}
$table .= '</table></body></html>';
echo $table;
}
}点击 "运行实例" 按钮查看在线实例
<?php require './controller/Controller.php'; use mvc\controller\Controller; $controller = new Controller; $controller->index();
点击 "运行实例" 按钮查看在线实例
MVC的设计思想是什么
MVC的核心思想是将一个应用分成三个基本部分：Model（模型）、View（视图）和Controller（控制器），这三个部分以最少的耦合协同工作，从而提高应用的可扩展性及可维护性
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