{
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);
