PHP Design Pattern Decorator Pattern code example _php Tutorial

Example of decorator pattern code in PHP design mode

This article mainly introduces the PHP design pattern of the decorator pattern code example, decorator mode is not to modify the original class code and inheritance in the case of dynamic extension of the function of the class, this article gives a code example, the need for friends can refer to the next

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:

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The person who is the decorator base class Interface Component { Public function operation (); } Decorator base class Abstract class Decorator implements Component { protected $component; Public function __construct (Component $component) { $this->component = $component; } Public Function operation () { $this->component->operation (); } } Concrete Decorator Class Class Concretecomponent implements Component { Public Function operation () { Echo ' do operation '. Php_eol; } } Concrete Decoration Class A Class Concretedecoratora extends Decorator { Public function __construct (Component $component) { Parent::__construct ($component); } Public function operation () { Parent::operation (); $this->addedoperationa (); Newly added operations } Public Function Addedoperationa () { Echo ' Add operation A '. Php_eol; } } Concrete 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 A */ $decoratorA = new Concretedecoratora (new Concretecomponent ()); $decoratorA->operation (); /* Do operation ADD Operation A ADD Operation B */ $decoratorB = new Concretedecoratorb ($decoratorA); $decoratorB->operation (); } } Client::main ();

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