装饰在 PHP 中的实现
Decorator is a Conceptual pattern that allows adding new behaviors to objects dynamically by placing them inside special wrapper objects.
Using decorators you can wrap objects countless number of times since both target objects and decorators follow the same interface. The resulting object will get a stacking behavior of all wrappers.
在 PHP 中使用模式
Usage examples: The Decorator is pretty standard in PHP code, especially in code related to streams.