原型模式

/**
* 原型模式
* 用原型实例指定创建对象的种类.并且通过拷贝这个原型来创建新的对象
*/
    abstract class Prototype
    {
        private $_id = null;
        
        public function __construct($id)
        {
            $this->_id =$id;
        }
        
        public function getID()
        {
            return $this->_id;
        }
        
        public function __clone() // magic function
        {
            $this->_id +=1;
        }
        
        public function getClone()
        {
            return clone $this;
        }
    }

    class ConcretePrototype extends Prototype
    {
        
    }

    $objPrototype = new ConcretePrototype(0);
    $objPrototype1 = clone $objPrototype;
    echo $objPrototype1->getID() . "<br/>";
    
    $objPrototype2 = $objPrototype;
    echo $objPrototype2->getID()."<br/>";
    
    $objPrototype3 = $objPrototype->getClone();
    echo $objPrototype3->getID() . "<br/>";

参考文章 https://wenku.baidu.com/view/b4c78b4702768e9951e738fb.html