class Role

{

    private $hp;

    private $attack;

    public function __construct($hp, $attack)

    {

        $this->hp = $hp;

        $this->attack = $attack;

    }

    public function fight()

    {

        $this->hp = 0;

        echo "开始打Boos,血条到了{$this->hp}" . PHP_EOL;

    }

    // 创建一个备份

    public function createMemento()

    {

        return new RoleMemento($this->hp, $this->attack);

    }

    public function restoreMemento(RoleMemento $memento)

    {

        $this->hp = $memento->getHp();

        $this->attack = $memento->getAttack();

        echo "又恢复了, 血条到了{$this->hp};攻击力到了{$this->attack}";

    }

}

class RoleMemento

{

    private $hp;

    private $attack;

    public function __construct($hp, $attack)

    {

        $this->hp = $hp;

        $this->attack = $attack;

    }

    public function __call($name, $args)

    {

        $name = strtolower(str_replace('get', '', $name));

        if (property_exists($this, $name)) {

            return $this->$name;

        }

    }

}

class MementoAdmin

{

    private $memento;

    public function setMemento(RoleMemento $roleMemento)

    {

        $this->memento = $roleMemento;

    }

    public function getMemento()

    {

        return $this->memento;

    }

}

$role = new Role(5900, 1500);

$admin = new MementoAdmin();

$admin->setMemento($role->createMemento()); // 创建一个备份

$role->fight();

$role->restoreMemento($admin->getMemento());