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Previous example was simply implementing a strategy pattern. A key problem is that WebService made clear that it did no actual output of its own - it handed it off to 'decorators'. A decorator should always wrap a class that already has its own complete, self-contained functionality. In this way, they only enhance / modify it. An instance that is non-decorated should work fully by itself. Note the distinguishing difference between this and sub-classing - here the enhancement is added dynamically, at runtime, and to one instance. With sub-classing, the enhancement is added at compile / parse time, and is applied to all instances / uses of the subclass.
design patterns in PHP
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 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.
Please feel free to fork and add your own examples!