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observer.php
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observer.php
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<?php
/**
* Interface Observer / Listener
*/
interface Observer
{
public function update(): void;
}
class ObserverImplementationA implements Observer
{
public function update(): void
{
echo '=^-^=' . '<br>';
}
}
class ObserverImplementationB implements Observer
{
public function update(): void
{
echo '>^_^<' . '<br>';
}
}
class Subject
{
private array $observers = [];
public function registerObserver(Observer $observer): void
{
$this->observers[] = $observer;
}
public function execute(): string
{
$this->notifyObserver();
return __METHOD__;
}
private function notifyObserver(): void
{
foreach ($this->observers as $observer) {
$observer->update();
}
}
}
/**
* Client
*/
$subject = new Subject();
$observerImplementationA = new ObserverImplementationA();
$observerImplementationB = new ObserverImplementationB();
$subject->registerObserver($observerImplementationA);
$subject->registerObserver($observerImplementationB);
echo $subject->execute();