observers = new SplObjectStorage();
}
/**
* Attach observer
* @param SplObserver $observer
* @return void
*/
public function attach(SplObserver $observer)
{
$this->observers->attach($observer);
}
/**
* Detach observer
* @param SplObserver $observer
* @return void
*/
public function detach(SplObserver $observer)
{
$this->observers->detach($observer);
}
/**
* When model subject is updated notify the observer
* @return void
*/
public function notify()
{
foreach ($this->observers as $observer) {
$observer->update($this);
}
}
/**
* This method set any anonymous property
* @param $name
* @param $value
* @return void
*/
public function __set($name, $value)
{
$this->data[$name] = $value;
$this->notify();
}
}
class ModelObserver implements SplObserver
{
/**
* Notify when subject is updated
* @param SplSubject $subject
* @return void
*/
public function update(SplSubject $subject)
{
echo get_class($subject) . ' has been updated' . '
';
}
}
class Observer2 implements SplObserver
{
/**
* Notify when subject is udpated
* @param SplSubject $subject
* @return void
*/
public function update(SplSubject $subject)
{
echo get_class($subject) . ' has been updated' . '
';
}
}
// Instantiate the model class for 2 different objects
$model1 = new Model();
$model2 = new Model();
// Instantiate the observers
$modelObserver = new ModelObserver();
$observer2 = new Observer2();
// Attach the observers to $model1
$model1->attach($modelObserver);
$model2->attach($observer2);
// Attach the observers to $model2
$model2->attach($observer2);
// Change the subject properties
$model1->title = 'Ba Ba Black Ship..';
$model2->body = 'Twinkle Twinkle Little Star..';