[php]php设计模式 Proxy (代理模式)

<?php
 2 /**
 3  * 代理模式
 4  *
 5  * 为其他对象提供一个代理以控制这个对象的访问
 6  *
 7 */
 8 interface Proxy
 9 {
10 publicfunction request();
11 publicfunction display();
12 }
13 
14 class RealSubject
15 {
16 publicfunction request()
17     {
18 echo"RealSubject request<br/>";
19     }
20 
21 publicfunction display()
22     {
23 echo"RealSubject display<br/>";
24     }
25 }
26 
27 class ProxySubject
28 {
29 private$_subject=null;
30 publicfunction __construct()
31     {
32 $this->_subject =new RealSubject();
33     }
34 
35 publicfunction request()
36     {
37 $this->_subject->request();
38     }
39 
40 publicfunction display()
41     {
42 $this->_subject->display();
43     }
44 }
45 
46 $objProxy=new ProxySubject();
47 $objProxy->request();
48 $objProxy->display();