# design patterns in PHP

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This is a collection of known design patterns and some sample code how to implement them in PHP. Every pattern has a small list of examples (most of them from Zend Framework, Symfony2 or Doctrine2 as I'm most familiar with this software).

I think the problem with patterns is that often people do know them but don't know when to apply which.

The patterns can be structured in roughly three different categories:

## Creational

* [AbstractFactory](AbstractFactory)
* [Builder](Builder)
* [SimpleFactory](SimpleFactory)
* [FactoryMethod](FactoryMethod)
* [StaticFactory](StaticFactory)
* [Prototype](Prototype)
* [Singleton](Singleton) (is considered an anti-pattern! :no_entry:)
* [Multiton](Multiton) (is considered an anti-pattern! :no_entry:)

## Structural

* [Adapter](Adapter)
* [Composite](Composite)
* [Decorator](Decorator)
* [Facade](Facade)
* [Proxy](Proxy)
* [Registry](Registry)
* [FluentInterface](FluentInterface)
* [DataMapper](DataMapper)
* [DependencyInjection](DependencyInjection)

## Behavioral

* [ChainOfResponsibilities](ChainOfResponsibilities)
* [Command](Command)
* [Iterator](Iterator)
* [Mediator](Mediator)
* [NullObject](NullObject)
* [Observer](Observer)
* [StatusPattern](StatusPattern)
* [Strategy](Strategy)
* [TemplateMethod](TemplateMethod)
* [Visitor](Visitor)

*Please feel free to fork and extend existing or add your own examples!*