装饰者

abstract class beverage{private $description;function getDescription(){return $this->description;}abstract function cost();}class coffA extends beverage{function getDescription(){return "this is a coff A";}function cost(){return 0.5;}}class coffB extends beverage{function getDescription(){return "this is a coff B";}function cost(){return 1.5;}}abstract class decorator extends beverage{}class mocca extends beverage{private $baverage;function mocca($baverage){$this->baverage = $baverage;}function getDescription(){return $this->baverage->getDescription()." with mocha";}function cost(){return $this->baverage->cost() + 2;}}class milk extends beverage{private $baverage;function milk($baverage){$this->baverage = $baverage;}function getDescription(){return $this->baverage->getDescription()." with milk";}function cost(){return $this->baverage->cost() + 3;}}$me = new coffA();$me = new mocca($me);$me = new milk($me);echo $me->getDescription();echo $me->cost();

先留点代码上去，以后慢慢完善。