[php]php设计模式 Prototype (原型模式)

<?php
 2 /**
 3  * 原型模式
 4  *
 5  * 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
 6  *
 7 */
 8 abstractclass Prototype
 9 {
10 private$_id=null;
11     
12 publicfunction __construct($id)
13     {
14 $this->_id =$id;
15     }
16 
17 publicfunction getID()
18     {
19 return$this->_id;
20     }
21 
22 publicfunction __clone() // magic function
23     {
24 $this->_id +=1;
25     }
26 
27 publicfunction getClone()
28     {
29 returnclone$this;
30     }
31 }
32 
33 class ConcretePrototype extends Prototype
34 {
35 }
36 
37 //
38 $objPrototype=new ConcretePrototype(0);
39 $objPrototype1=clone$objPrototype;
40 echo$objPrototype1->getID()."<br/>";
41 $objPrototype2=$objPrototype;
42 echo$objPrototype2->getID()."<br/>";
43 
44 $objPrototype3=$objPrototype->getClone();
45 echo$objPrototype3->getID()."<br/>";