public function __construct()
{
echo "Tworzenie 3 konkretnych obserwatorów i konkretnego podmiotu <BR>";
$ob1 = new ConcreteObserver();
$ob2 = new ConcreteObserver();
$ob3 = new ConcreteObserver();
$subject = new ConcreteSubject();
$subject->setObservers();
$subject->setData("Oto twoje dane!");
$subject->attach($ob1);
$subject->attach($ob2);
$subject->attach($ob3);
$subject->notify();
echo "Odpięcie obserwatora ob3. Powiadamiane będą ob1 i ob2<BR>";
$subject->detach($ob3);
$subject->notify();
echo "Reset danych, podpięcie ob3 i dopięcie ob2, tylko ob1 i ob3 będą powiadamiane: <BR>";
$subject->setData("Dane dla obiektów ob1 i ob3");
$subject->attach($ob3);
$subject->detach($ob2);
$subject->notify();
}
*/
class ConcreteSubject extends Subject
{
public $state;
}
/*
* 具体观察者
*/
class ConcreteObserver extends Observer
{
private $_name;
private $_subject;
public function __construct($name, Subject $subject)
{
$this->_name = $name;
$this->_subject = $subject;
}
public function update()
{
var_dump(sprintf('观察者：%s，通知者的状态是：%s，请做出相应的反应。', $this->_name, $this->_subject->state));
}
}
###################################################################################
$concreteSubject = new ConcreteSubject();
//通知者
$concreteObserver = new ConcreteObserver('张三', $concreteSubject);
//观察者
$concreteSubject->attach($concreteObserver);
$concreteSubject->state = 'abc';
$concreteSubject->notify();
{
echo 'I must have supper.I am so hungry.<br />';
}
}
class Observer3 extends AbstractObserver
{
function action()
{
echo 'I must go to bed.<br />';
}
}
class Observer4 extends AbstractObserver
{
function action()
{
echo 'I will go to see my classmate tomorrow.<br />';
}
}
//test
$subject = new ConcreteSubject();
$subject->add('Observer1');
$subject->add('Observer2');
$subject->add('Observer3');
$subject->notify(9);
var_dump($subject->__get('observers'));
$subject->add('Observer4');
var_dump($subject->__get('observers'));
$subject->notify(10);
$subject->splice('Observer2');
var_dump($subject->__get('observers'));
$subject->notify(14);
