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本文实例讲述了PHP面向对象程序设计组合模式与装饰模式。分享给大家供大家参考，具体如下：
组合模式
定义：组合模式定义了一个单根继承体系，使具有截然不同职责的集合可以并肩工作。
一个军队的案例，
<"htmlcode"><"htmlcode"><"\n"; $army2 = clone $army; // 克隆军队 $army->addArmy( $army2 ); print $army->bombardStrength(); print "\n"; "htmlcode"><"\n"; $army->removeUnit( $soldier ); print_r( $army ); print $army->bombardStrength()."\n"; "htmlcode">Army Object ( [units:Army:private] => Array ( [0] => Soldier Object ( ) [1] => Tank Object ( ) [2] => Tank Object ( ) ) ) 16 Army Object ( [units:Army:private] => Array ( [1] => Tank Object ( ) [2] => Tank Object ( ) ) ) 8添加异常处理
<" is a leaf" ); } function removeUnit( Unit $unit ) { throw new UnitException( get_class($this)." is a leaf" ); } function bombardStrength() { return 4; } } $archer = new Archer(); $archer2 = new Archer(); $archer->addUnit( $archer2 ); "htmlcode"><" is a leaf" ); } function removeUnit( Unit $unit ) { throw new UnitException( get_class($this)." is a leaf" ); } } class Archer extends Unit { function bombardStrength() { return 4; } } class LaserCannonUnit extends Unit { function bombardStrength() { return 44; } } class Army extends Unit { private $units = array(); function addUnit( Unit $unit ) { if ( in_array( $unit, $this->units, true ) ) { return; } $this->units[] = $unit; } function removeUnit( Unit $unit ) { // >= php 5.3 //$this->units = array_udiff( $this->units, array( $unit ), // function( $a, $b ) { return ($a === $b)"attacking with strength: {$main_army->bombardStrength()}\n"; "htmlcode"><"htmlcode">Army Object ( [units:CompositeUnit:private] => Array ( [0] => Archer Object ( ) [1] => Archer Object ( ) [2] => Army Object ( [units:CompositeUnit:private] => Array ( [0] => Archer Object ( ) [1] => Archer Object ( ) [2] => LaserCannonUnit Object ( ) ) ) ) )点评：Unit 基础，CompositeUnit复合中实现add与remove。军队继承Composite，射手继承Archer。这样射手中就不会有多余的add与remove方法了。
装饰模式
装饰模式帮助我们改变具体组件的功能。
看例子
<"htmlcode"><"htmlcode"><": doing something useful with request\n"; } } abstract class DecorateProcess extends ProcessRequest { // 装饰进程 protected $processrequest; function __construct( ProcessRequest $pr ) { // 引用对象，委托 $this->processrequest = $pr; } } class LogRequest extends DecorateProcess { // 日志请求 function process( RequestHelper $req ) { print __CLASS__.": logging request\n"; // 当前类,有点递归的感觉 $this->processrequest->process( $req ); } } class AuthenticateRequest extends DecorateProcess { // 认证请求 function process( RequestHelper $req ) { print __CLASS__.": authenticating request\n"; $this->processrequest->process( $req ); } } class StructureRequest extends DecorateProcess { // 组织结构请求 function process( RequestHelper $req ) { print __CLASS__.": structuring request\n"; $this->processrequest->process( $req ); } } $process = new AuthenticateRequest( new StructureRequest( new LogRequest ( new MainProcess() ))); // 这样可以很灵活的组合进程的关系，省去很多重复的继承 $process->process( new RequestHelper() ); print_r($process); "htmlcode">AuthenticateRequest: authenticating request StructureRequest: structuring request LogRequest: logging request MainProcess: doing something useful with request AuthenticateRequest Object ( [processrequest:protected] => StructureRequest Object ( [processrequest:protected] => LogRequest Object ( [processrequest:protected] => MainProcess Object ( ) ) ) )点评：这里有一种递归的感觉，一层调用一层。模式是牛人总结出来用于灵活的解决一些现实问题的。牛！给开发多一点思路。
更多关于PHP相关内容感兴趣的读者可查看本站专题：《php面向对象程序设计入门教程》、《PHP基本语法入门教程》、《PHP运算与运算符用法总结》、《PHP网络编程技巧总结》、《PHP数组(Array)操作技巧大全》、《php字符串(string)用法总结》、《php+mysql数据库操作入门教程》及《php常见数据库操作技巧汇总》
希望本文所述对大家PHP程序设计有所帮助。
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