设计模式之原型模式

interface Prototype{
    public function cloneMe();
}

class Object1 implements Prototype{
    private $obj;
    private $num=1;
    
    public function cloneMe(){
        return clone $this; 
    }
    
    /**
    *__clone方法是在对象被成功复制后调用的，并且调用的是新对象的clone方法，而不是原对象。
    */
    public function __clone(){
        $this->obj && ($this->obj = clone $this->obj); //实现深度复制。
    }
    
    public function setNumber($num){
        $this->num = $num;
    }
    
    public function setObj($obj){
        $this->obj = $obj;
    }
    
    public function show(){
        echo 'This is Object'.$this->num.'<br>';
    }
}

$object1 = new Object1();
$copyObject1 = $object1->cloneMe();
$copyObject1->setNumber(2);
$object1->show();
$copyObject1->show();