To dynamically add new functionality to class instances.

• Zend Framework: decorators for Zend_Form_Element instances
• Web Service Layer: Decorators JSON and XML for a REST service (in this case, only one of these should be allowed of course)

You can also find these code on GitHub

RenderableInterface.php

.. literalinclude:: RenderableInterface.php
   :language: php
   :linenos:

Webservice.php

.. literalinclude:: Webservice.php
   :language: php
   :linenos:

RendererDecorator.php

.. literalinclude:: RendererDecorator.php
   :language: php
   :linenos:

XmlRenderer.php

.. literalinclude:: XmlRenderer.php
   :language: php
   :linenos:

JsonRenderer.php

.. literalinclude:: JsonRenderer.php
   :language: php
   :linenos:

Tests/DecoratorTest.php

.. literalinclude:: Tests/DecoratorTest.php
   :language: php
   :linenos: