PHP design pattern-decorator pattern code example

PHP design pattern-decorator pattern code example

This article mainly introduces the PHP decorator mode code example. The decorator mode dynamically extends the class functions without modifying the original class code and inheritance, this article provides code examples. For more information, see

Definition:

The modifier mode dynamically extends the class functions without modifying the original class code and inheritance. The traditional programming mode is that subclass inherits the parent class implementation method overload. With the decorator mode, you only need to add a new decorator object, which is more flexible and avoids too many classes and layers.

Role:

Component (base class of the decorated object)

ConcreteComponent (specific object to be decorated)

Decorator)

ContreteDecorator (Specific modifier class)

Sample Code:

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// Decorator base class Interface Component { Public function operation (); }   // Modifier base class Abstract class Decorator implements Component { Protected $ component;   Public function _ construct (Component $ component) { $ This-> component = $ component; }   Public function operation () { $ This-> component-> operation (); } }   // Specific modifier class Class ConcreteComponent implements Component { Public function operation () { Echo 'do operation'. PHP_EOL; } }   // Specific decoration Class Class ConcreteDecoratorA extends Decorator { Public function _ construct (Component $ component ){ Parent: :__ construct ($ component );   }   Public function operation (){ Parent: operation (); $ This-> addedOperationA (); // Newly Added Operation }   Public function addedOperationA (){ Echo 'add Operation A'. PHP_EOL; } }   // Specific decoration Class 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 */ $ DecoratorA = new ConcreteDecoratorA (new ConcreteComponent ()); $ DecoratorA-> operation ();     /* Do operation Add Operation Add Operation B */ $ DecoratorB = new ConcreteDecoratorB ($ decoratorA ); $ DecoratorB-> operation (); }   }   Client: main ();