}
}
/**
* 观察者要实现的接口
*/
interface Observerable
{
public function update();
}
class Subscriber implements Observerable
{
public function update()
{
echo "Callback\n";
}
}
class Subscriber1 implements Observerable
{
public function update()
{
echo "test22222\n";
}
}
//下面是测试代码
/* 测试 */
$paper = new Paper();
$paper->register(new Subscriber());
$paper->register(new Subscriber1());
//$paper->register(new Subscriber2());
$paper->trigger();
