2022年PHP设计模式实例之 .pdf

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1、PHP设计模式实例之（观察者模式、策略模式、简单工厂模式）观察者模式/* * 定义观察接口*/ interface Subject public function Attach($Observer); /添加观察者public function Detach($Observer); /踢出观察者public function Notify (); /满足条件时通知观察者public function SubjectState($Subject); /观察条件/* * 观察类的具体实现*/ class Boss Implements Subject public $_action;private

2、 $_Observer;public function Attach ($Observer) $this-_Observer = $Observer; public function Detach($Observer) $ObserverKey = array_search($Observer, $this-_Observer);if( $ObserverKey != false) unset($this-_Observer$ObserverKey ); public function Notify() foreach($this-_Observer as $value ) 名师资料总结 -

3、- -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 1 页，共 7 页 - - - - - - - - - $value-Update(); public function SubjectState ($Subject) $this-_action = $Subject; /* * 抽象观察者* */ abstract class Observer protected $_UserName;protected $_Sub;public function _construct ( $Name , $Sub)

4、 $this-_UserName = $Name; $this-_Sub = $Sub; public abstract function Update(); /接收通过方法/* * 观察者*/ class StockObserver extends Observer public function _construct($name,$sub) parent:_construct($name,$sub); public function Update() echo $this-_Sub-_action.$this -_UserName.” 你赶快跑 ” ; 名师资料总结 - - -精品资料欢迎

5、下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 2 页，共 7 页 - - - - - - - - - $huhansan = new Boss(); /被观察者$gongshil = new StockObserver ( “三毛” , $huhansan); /初始化观察者$huhansan-Attach ( $gongshil ); /添加一个观察者$huhansan-Attach ($gongshil ); /添加一个相同的观察者$huhansan-Detach($gongshil ); /踢出基中一个观察者$

6、huhansan-SubjectState ( “警察来了” ); /达到满足的条件$huhansan-Notify (); / 通过所有有效的观察者策略模式/* * 定义支持算法的接口* */ abstract class Strategy abstract public function AlgorithmInterface (); class ConcreateStratA extends Strategy public function AlgorithmInterface () echo “ 算法 A” ; class ConcreateStratB extends Strategy

7、 public function AlgorithmInterface () echo “ 算法 B” ; class ConcreateStratC extends Strategy public function AlgorithmInterface () echo “ 算法 C” ; 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 3 页，共 7 页 - - - - - - - - - class Context private $_StrObj ;public functio

8、n _construct ( $strobj) $this-_StrObj = $strobj ; public function ContextInterface() $this-_StrObj -AlgorithmInterface (); $context = new Context (new ConcreateStratA); $context-ContextInterface (); $context = new Context(new ConcreateStratC); $context-ContextInterface (); $context = new Context(new

9、 ConcreateStratB); $context-ContextInterface ();简单工厂模式/* * 定义运算类* */ abstract class Operation /存储第一个数字protected $_NumberA = 0;/存储第二个数字protected $_NumberB = 0;/存储运算结果protected $_Result = 0;public function _construct() 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 4 页

10、，共 7 页 - - - - - - - - - /empty /* * 设定需要运行的二个数字* * param 第一个数字$A * param 第二个数字$B */ public function SetNumber ($A=0,$B=0) $this-_NumberA = $A; $this-_NumberB = $B; /* * 清除所有数据* */ protected function ClearResult () $this-_Result = 0; abstract function GetResult(); /* * 数据相加*/ class OperactionAdd ext

11、ends Operation public function GetResult() $this-_Result = $this-_NumberA + $this-_NumberB ;return $this -_Result; /* * 数据相减*/ class OperactionSub extends Operation 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 5 页，共 7 页 - - - - - - - - - public function GetResult()

12、 $this-_Result = $this-_NumberA - $this-_NumberB ;return $this -_Result; /* * 数据相乘*/ class OperactionMul extends Operation public function GetResult() $this-_Result = $this-_NumberA * $this-_NumberB ;return $this -_Result; /* * 数据相除*/ class OperactionDiv extends Operation public function GetResult()

13、 $this-_Result = $this-_NumberA / $this-_NumberB ;return $this -_Result; class OperactionFactory private static $_Obj ;public static function CreateOperaction ( $type) switch( $type) case “ +”: self:$_Obj = new OperactionAdd ; break; 名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 -

14、- - - - - - 第 6 页，共 7 页 - - - - - - - - - case “ -” : self:$_Obj = new OperactionSub ; break; case “ *”: self:$_Obj = new OperactionMul ; break; case “ / ”: self:$_Obj = new OperactionDiv ; break; return self : $_Obj; $Obj = OperactionFactory: CreateOperaction ( “*”); $Obj -SetNumber(6,4); $num = $Obj-GetResult(); var_dump($num);名师资料总结 - - -精品资料欢迎下载 - - - - - - - - - - - - - - - - - - 名师精心整理 - - - - - - - 第 7 页，共 7 页 - - - - - - - - -