PHP Design Pattern Decorator Pattern code example, PHP design mode _php Tutorial

PHP Design Pattern Decorator Pattern code example, PHP design mode

Defined:

Decorator mode is the ability to dynamically extend a class without modifying the original class code and inheritance. The traditional programming pattern is the subclass inherits the parent class implementation method overload, uses the adorner pattern, simply adds a new adorner object, is more flexible, avoids the class quantity and the hierarchy too much.

Role:

Component (base class for decorative objects)
Concretecomponent (specifically decorated objects)
Decorator (Decorator base class)
Contretedecorator (Specific decorator Class)

Example code:

The Decorator base class interface component{Public function operation ();}//Decorator base class abstract class Decorator implements component{protect   Ed $component;  Public function __construct (Component $component) {$this->component = $component;  Public function operation () {$this->component->operation (); }}//Concrete decorator class Concretecomponent implements component{Public function operation () {echo ' do operation '.  Php_eol; }}//Concrete decoration class AClass Concretedecoratora extends Decorator {public function __construct (Component $component) {parent::__   Construct ($component);    } public Function operation () {parent::operation ();  $this->addedoperationa (); New added action} public Function Addedoperationa () {echo ' Add Operation A '.  Php_eol; }}//Concrete decoration class Bclass 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 C    Oncretedecoratora (New Concretecomponent ());      $decoratorA->operation ();    /* Do operation add operation A Add Operation B */$decoratorB = new Concretedecoratorb ($decoratorA);  $decoratorB->operation (); }} client::main ();

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