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HomeBackend DevelopmentPHP TutorialPHP设计模式--原型模式

     声明:本系列博客参考资料《大话设计模式》,作者程杰。

       用原型实例指定创建对象的种类,并且通过拷贝这些原型创建新的对象。Prototype模式允许一个对象再创建另外一个可定制的对象,根本无需知道任何如何创建的细节,通过将一个原型对象传给那个要发动创建的对象,这个要发动创建的对象通过请求原型对象拷贝它们自己来实施创建。它主要面对的问题是:“某些结构复杂的对象”的创建工作;由于需求的变化,这些对象经常面临着剧烈的变化,但是他们却拥有比较稳定一致的接口。

     

          在php中,类已经实现了原型模式,php有个魔术方法__clone()方法,会克隆出一个这样的对象。

         看一下UML类图:


       角色分析:

       1.抽象原型,提供了一个克隆的接口

       2.具体的原型,实现克隆的接口


      具体的代码:

      

/**抽象原型类 * Class Prototype */abstract class Prototype{   abstract function cloned();}/**具体原型类 * Class Plane */class Plane extends Prototype{    public $color;    function Fly()    {        echo "飞机飞啊飞!<br>";    }    function cloned()    {        return clone $this;    }}

        客户端测试代码:

        

header("Content-Type:text/html;charset=utf-8");//------------------------原型模式测试代码------------------require_once "./Prototype/Prototype.php";$plane1=new Plane();$plane1->color="Blue";$plane2=$plane1->cloned();$plane1->Fly();$plane2->Fly();echo "plane1的颜色为:{$plane1->color}<br>";echo "plane2的颜色为:{$plane2->color}<br>";

         这里只是介绍一下原型模式的核心思想,其实在实际开发中直接clone即可。


       PHP面向对象设计模式


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