PHP设计模式学习笔记——观察者模式

实例

<?php
/**
* @Description: 观察者模式
* @Author: luoxiaojin
* @Date: 2020-06-29 15:28:37
* @LastEditors: luoxiaojin
* @LastEditTime: 2020-06-29 16:19:34
* @FilePath: \design_patterns\l5.php
*/

// 观察者 SplObserver，被观察者 SplSubject

class user implements SplSubject{
    public $loginNum = 0;
    public $hobbys = ['reading','singing','sporting','running','eating','study','codeing'];
    public $hobby;
    private $obStorage;

    public function __construct(){
        $this->loginNum = rand(1,10);
        $this->hobby = $this->hobbys[rand(0,count($this->hobbys)-1)];
        $this->obStorage = new SplObjectStorage();
    }
    public function login(){
        sleep(0.5);
        $this->notify();
    }

    public function attach(\SplObserver $observer){
        $this->obStorage->attach($observer);
    }

    public function detach(\SplObserver $observer){
        $this->obStorage->detach($observer);
    }

    public function notify(){
        $this->obStorage->rewind();
        while ($this->obStorage->valid()) {
            $this->obStorage->current()->update($this);
            $this->obStorage->next();
        }
    }
}

class SafeCener implements SplObserver{
    public function update(\SplSubject $subject){
        var_dump($subject->loginNum);
    }
}

class AdCenter implements SplObserver{
    public function update(\SplSubject $subject){
        var_dump($subject->hobby);
    }
}

// 实施观察
$user = new user();
$obs1 = new SafeCener();
$obs2 = new AdCenter();

$user->attach($obs1);
$user->attach($obs2);
$user->login();

——学习参考与 bilibili燕十八 面向对象与设计模式