php--php设计模式留存

装饰者模式

<?php

interface Decorator
{
    public function display();
}

class XiaoFang implements Decorator
{
    private $name;

    public function __construct($name)
    {
        $this->name = $name;
    }

    public function display()
    {
        echo "我是".$this->name."我出门了！！！".'<br>';
    }
}

class Finery implements Decorator
{
    private $component;

    public function __construct(Decorator $component)
    {
        $this->component = $component;
    }

    public function display()
    {
        $this->component->display();
    }
}

class Shoes extends Finery
{
    public function display()
    {
        echo "穿上鞋子".'<br>';
        parent::display();
    }
}

class Skirt extends Finery
{
    public function display()
    {
        echo "穿上衣服".'<br>';
        parent::display();
    }
}

class Fire extends Finery
{
    public function display()
    {
        echo "出门前先整理头发".'<br>';
        parent::display();
        echo '出门后再整理一下头发'.'<br>';
    }
}

$xiaofang = new XiaoFang('小芳');
$shoes = new Shoes($xiaofang);
$skirt = new Skirt($shoes);
$fire = new Fire($skirt);
$fire->display();

观察者模式

<?php

abstract class EventGenerator
{
    private $observers = [];

    public function add(Observer $observer)
    {
        $this->observers[] = $observer;
    }

    public function notify()
    {
        foreach ($this->observers as $observer) {
            $observer->update();
        }
    }
}

interface Observer
{
    public function update($eventInfo = null);
}

class Li implements Observer
{
    public function update($eventInfo = null)
    {
        echo '观察者小李，收到通知，执行完毕！\n';
    }
}

class Wang implements Observer
{
    public function update($eventInfo = null)
    {
        echo '观察者小王，收到通知，执行完毕！\n';
    }
}

class Event extends EventGenerator
{
    public function trigger()
    {
        $this->notify();
    }
}

$event = new Event();
$event->add(new Li());
$event->add(new Wang());
$event->trigger();