观察者模式

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<?php #观察者模式     /** 观察者模式属于行为模式，是定义对象间的一种一对多的依赖关系，以便当一个对象的状态发生改变时，所有依 赖于它的对象都得到通知并自动刷新。 它完美的将观察者对象和被观察者对象分离。 可以在独立的对象（主体）中维护一个对主体感兴趣的依赖项（观察器）列表。 让所有观察器各自实现公共的 Observer 接口，以取消主体和依赖性对象之间的直接依赖关系。  */   //具体主题角色 class user implements SplSubject{     public $lognum;     public $hobby;     protected $observers = array();       public function __construct($hobby){         $this->lognum = rand(1,10);         $this->hobby = $hobby; //  $this->observers = new SplObjectStorage();         $this->observers = array();     }       public function login(){         $this->notify();     } //增加一个新的观察者对象     public function attach(SplObserver $observer){ //  $this->observers->attach($observer);         array_push($this->observers,$observer);     } //除一个已注册过的观察者对象     public function detach(SplObserver $observer){ //  $this->observers->detach($observer);         $index = array_search($observer, $this->observers);         if ($index === FALSE || ! array_key_exists($index, $this->observers)) {             return FALSE;         }           unset($this->observers[$index]);         return TRUE;     } //通知所有注册过的观察者对象     public function notify(){ //  $this->observers->rewind(); //  while($this->observers->valid()){ //  $observer = $this->observers->current(); //  $observer->update($this); //  $this->observers->next(); //  }           if (!is_array($this->observers)) {             return FALSE;         }           foreach ($this->observers as $observer) {             $observer->update($this);         }         return TRUE;     }     }   //观察者角色 class secrity implements SplObserver{     public function update(SplSubject $subject){         if($subject->lognum <5){             echo $subject->lognum." < 5";         }else{             echo $subject->lognum." >= 5";         }       } } //观察者角色 class ad implements SplObserver{     public function update(SplSubject $subject){         if($subject->hobby == "sport"){             echo $subject->hobby."我爱运动";         }else{             echo "不爱运动哦！";         }       } }     $user = new user("sport1"); $user->attach(new secrity()); $user->attach(new ad()); $user->login();

　　

 

 

<?php

/**
 * Class Subject
 * 抽象目标类
 */
abstract class Subject
{
    protected $stateNow;
    protected $observers = [];

    public function attach(Observer $observer)
    {
        array_push($this->observers, $observer);
    }

    public function detach(Observer $ob)
    {
        $pos = 0;
        foreach ($this->observers as $viewer) {
            if ($viewer == $ob) {
                array_splice($this->observers, $pos, 1);
            }
            $pos++;
        }
    }

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


/**
 * Class ConcreteSubject
 * 具体目标类
 */
class ConcreteSubject extends Subject
{
    public function setState($state)
    {
        $this->stateNow = $state;
        $this->notify();
    }

    public function getState()
    {
        return $this->stateNow;
    }
}

//抽象观察者
abstract class Observer
{
    abstract public function update(Subject $subject);
}


//具体观察者
class ConcreteObserverDT extends Observer
{
    private $currentState;

    public function update(Subject $subject)
    {
        $this->currentState = $subject->getState();

        echo '<div style="font-size:10px;">'. $this->currentState .'</div>';
    }
}

class ConcreteObserverPhone extends Observer
{
    private $currentState;

    public function update(Subject $subject)
    {
        $this->currentState = $subject->getState();

        echo '<div style="font-size:20px;">'. $this->currentState .'</div>';
    }
}



//使用观察者模式
class Client
{
    public function __construct()
    {
        $sub = new ConcreteSubject();

        $obDT = new ConcreteObserverDT();
        $obPhone = new ConcreteObserverPhone();

        $sub->attach($obDT);
        $sub->attach($obPhone);
        $sub->setState('Hello World');
    }
}

$worker = new Client();