PHP实战案例：MVC案例演示（服务容器和门面技术）

演示代码：

1、model代码

<?php
namespace MVC;
// use PDO;
class Model
{
    protected $dsn;
    protected $username;
    protected $password;
    protected static $db=null;
    public function __construct($dsn,$username,$password)
    {
        $this->dsn=$dsn;
        $this->username=$username;
        $this->password=$password;
        self::$db=new \PDO($this->dsn,$this->username,$this->password);
    }
    public function select($limit,$num)
    {
        $sql="select * FROM `staffs` LIMIT {$limit} OFFSET {$num}";
        $res=self::$db->query($sql);
        return $res->fetchAll(\PDO::FETCH_ASSOC);
    }
}

2、view代码（略）
3、control代码

<?php 
namespace MVC;
// 引入model和view
require 'Model.php';
require 'View.php';
// 准备数据库连接参数
$dsn='mysql:host=php.edu;dbname=php.edu;charset=utf8;port=3306';
$username='phpedu';
$password='123456';
// 服务容器
class Container
{
    protected $class_container=[];
    public function bind($class,\Closure $obj)
    {
        $this->class_container[$class]=$obj;
    }
    public function make($class,$params=[]){
        return call_user_func_array($this->class_container[$class],$params);
    }
}
$container=new Container;
$container->bind('model',function()use($dsn,$username,$password){return new Model($dsn,$username,$password);});
$container->bind('view',function (){return new View();});
// 控制类(外部model和view对象注入)
/*
class Control
{
    protected $model;
    protected $view;
    public function __construct(Model $model,View $view)
    {
        $this->model=$model;
        $this->view=$view;
    }
    public function html($n,$m)
    {
        $data=$this->model->select($n,$m);
        return  $this->view->index($data);
    }
}
$model=new Model($dsn,$username,$password);
$view=new View();
echo (new Control($model,$view))->html(5,10);
*/
// 控制类，面向服务容器的形式
class Control
{
    public function html(Container $container,$n,$m)
    {
        $data=$container->make('model')->select($n,$m);
        return  $container->make('view')->index($data);
    }
}
echo (new Control())->html($container,10,10);

4、control类门面技术：

//定义门面类
class Facades
{
    public static $class=null;
    public static $data=[];
    public static function class(Container $container)
    {
        static::$class=$container;
    }
}
//模型类静态接口
class Model1 extends Facades
{
    public static function getdata($n,$m)
    {
        static::$data=static::$class->make('model')->select($n,$m);
    }
}
//视图类静态接口
class View1 extends Facades
{
    public static function index($data)
    {
        return static::$data=static::$class->make('view')->index($data);
    }
}
//控制类
class Control
{   protected $container;
    public function __construct(Container $container){
        $this->container=$container;
        Facades::class($this->container);
    }
    public function html($n,$m)
    {
        Model1::getdata($n,$m);
        return  View1::index(Facades::$data);
    }
    //自动销毁服务容器
    public function __destruct()
    {
        $this->container=null;
    }
}
//客户端代码，匿名类使用完自动销毁
echo (new Control($container))->html(12,10);

5、演示结果：

总结：

1、call_user_func_array():利用回调函数处理数组
2、MVC是一个经典的：数据，视图，控制器分离的代码组织方法；
3、服务容器类：把所有需要实列化的类统一交给一个类来管理；
4、facades(门面技术)是把服务容器中的对象（静态接口）实现静态化访问；