PHP設計模式之裝飾者模式代碼實例

 　　這篇文章主要介紹了PHP設計模式之裝飾者模式代碼實例,裝飾者模式就是不修改原類代碼和繼承的情況下動態擴展類的功能,本文就給出了代碼實例,需要的朋友可以參考下

　　定義：

　　裝飾者模式就是不修改原類代碼和繼承的情況下動態擴展類的功能。傳統的編程模式都是子類繼承父類實現方法重載，使用裝飾器模式，只需添加一個新的裝飾器對象，更加靈活，避免類數量和層次過多。

　　角色：

　　Component(被裝飾對象基類)

　　ConcreteComponent(具體被裝飾對象)

　　Decorator(裝飾者基類)

　　ContreteDecorator(具體的裝飾者類)

　　示例代碼：

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 //被裝飾者基類 interface Component { public function operation(); }   //裝飾者基類 abstract class Decorator implements Component { protected $component;   public function __construct(Component $component) { $this->component = $component; }   public function operation() { $this->component->operation(); } }   //具體裝飾者類 class ConcreteComponent implements Component { public function operation() { echo 'do operation'.PHP_EOL; } }   //具體裝飾類A class ConcreteDecoratorA extends Decorator { public function __construct(Component $component) { parent::__construct($component);   }   public function operation() { parent::operation(); $this->addedOperationA(); // 新增加的操作 }   public function addedOperationA() { echo 'Add Operation A '.PHP_EOL; } }   //具體裝飾類B class ConcreteDecoratorB extends Decorator { public function __construct(Component $component) { parent::__construct($component);   }   public function operation() { parent::operation(); $this->addedOperationB(); }   public function addedOperationB() { echo 'Add Operation B '.PHP_EOL; } }     class Client {   public static function main() { /* do operation Add Operation A */ $decoratorA = new ConcreteDecoratorA(new ConcreteComponent()); $decoratorA->operation();     /* do operation Add Operation A Add Operation B */ $decoratorB = new ConcreteDecoratorB($decoratorA); $decoratorB->operation(); }   }   Client::main();