PHP Originator::set_state示例

class Caretaker
{
    private $memento;
    public function get_memento()
    {
        return $this->memento;
    }
    public function set_memento($memento)
    {
        $this->memento = $memento;
    }
}
//客户端，即测试
$o = new Originator();
$state = 'On';
$o->set_state($state);
$o->show();
$c = new Caretaker();
$memento = $o->create_memento();
//$o2 = new Originator();
$state2 = '2';
$o->set_state($state2);
$o->show();
$memento2 = $o->create_memento();
$c->set_memento($memento);
$c->set_memento($memento2);
$state = 'Off';
$o->set_state($state);
$o->show();
//var_dump($memento2);
//$memento = $c->get_memento();