简介：这是php设计模式 Chain Of Responsibility (职责链模式)的详细页面，介绍了和php,有关的知识、技巧、经验，和一些php源码等。
class='pingjiaF' frameborder='0' src='http://biancheng.dnbcw.info/pingjia.php?id=339157' scrolling='no'>1 <?php
2 /**
3 * 职责链模式
4 *
5 * 为解除请求的发送者和接收者之间的耦合,而使用多个对象都用机会处理这个请求,将这些对象连成一条链,并沿着这条链传递该请求,直到有一个对象处理它
6 *
7 */
8 abstract class Handler
9 {
10 protected $_handler = null;
11
12 public function setSuccessor($handler)
13 {
14 $this->_handler = $handler;
15 }
16
17 abstract function handleRequest($request);
18 }
19
20 class ConcreteHandlerZero extends Handler
21 {
22 public function handleRequest($request)
23 {
24 if($request == 0)
25 {
26 echo "0<br/>";
27 } else {
28 $this->_handler->handleRequest($request);
29 }
30 }
31 }
32
33 class ConcreteHandlerOdd extends Handler
34 {
35 public function handleRequest($request)
36 {
37 if($request % 2)
38 {
39 echo $request." is odd<br/>";
40 } else {
41 $this->_handler->handleRequest($request);
42 }
43 }
44 }
45
46 class ConcreteHandlerEven extends Handler
47 {
48 public function handleRequest($request)
49 {
50 if(!($request % 2))
51 {
52 echo $request." is even<br/>";
53 } else {
54 $this->_handler->handleRequest($request);
55 }
56 }
57 }
58
59
60 // 实例一下
61 $objZeroHander = new ConcreteHandlerZero();
62 $objEvenHander = new ConcreteHandlerEven();
63 $objOddHander = new ConcreteHandlerOdd();
64 $objZeroHander->setSuccessor($objEvenHander);
65 $objEvenHander->setSuccessor($objOddHander);
66
67 foreach(array(2,3,4,5,0) as $row)
68 {
69 $objZeroHander->handleRequest($row);
70 }