PHP设计模式实例之(观察者模式、策略模式、简单工厂模式).doc

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 Subjectpublic 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 Subjectpublic $_action;private $_Observer;public function Attach($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 $value )$value-Update();public function SubjectState($Subject)$this-_action = $Subject;/* 抽象观察者*/abstract class Observerprotected $_UserName;protected $_Sub;public function _construct($Name,$Sub)$this-_UserName = $Name;$this-_Sub = $Sub;public abstract function Update(); /接收通过方法/* 观察者*/class StockObserver extends Observerpublic function _construct($name,$sub)parent:_construct($name,$sub);public function Update()echo $this-_Sub-_action.$this-_UserName.” 你赶快跑”;$huhansan = new Boss(); /被观察者$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($gongshil); /踢出基中一个观察者$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 Strategyabstract public function AlgorithmInterface();class ConcreateStratA extends Strategypublic function AlgorithmInterface()echo “算法A”;class ConcreateStratB extends Strategypublic function AlgorithmInterface()echo “算法B”;class ConcreateStratC extends Strategypublic function AlgorithmInterface()echo “算法C”;class Contextprivate $_StrObj;public function _construct($strobj)$this-_StrObj = $strobj;public function ContextInterface()$this-_StrObj-AlgorithmInterface();$context = new Context(new ConcreateStratA);$context-ContextInterface();$context = new Context(new ConcreateStratC);$context-ContextInterface();$context = new Context(new ConcreateStratB);$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()/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 extends Operationpublic function GetResult()$this-_Result = $this-_NumberA + $this-_NumberB;return $this-_Result;/* 数据相减*/class OperactionSub extends Operationpublic function GetResult()$this-_Result = $this-_NumberA - $this-_NumberB;return $this-_Result;/* 数据相乘*/class OperactionMul extends Operationpublic function GetResult()$this-_Result = $this-_NumberA * $this-_NumberB;return $this-_Result;/* 数据相除*/class OperactionDiv extends Operationpublic function GetResult()$this-_Result = $this-_NumberA / $this-_NumberB;return $this-_Result;class OperactionFactoryprivate static $_Obj;public static function CreateOperaction($type)switch($type)case “+”:self:$_Obj = new OperactionAdd;break;case “-”:self:$_Obj = new OperactionSub;break;case “*”:self:$_Obj = new OperactionMul;break;ca