装饰器模式： 动态地给一个对象添加一些额外的职责或者行为。就增加功能来说， Decorator模式相比生成子类更为灵活。

　类结构图：

php代码示例：

     name = $tname;    }    function Show(){        print "dressed ".($this->name)."\n";    }}class Finery extends Person{    protected $componet=null;    function __construct(){    }    function Decorate($ct){        $this -> componet = $ct;    }    function Show(){        if(!is_null($this -> componet)){            $this -> componet -> Show();        }    }}class TShirts extends Finery{    function Show(){        print "Big T-shirt\n";        $this -> componet -> Show();    }}class BigTrouser extends Finery{    function Show(){        print "Big Trouser ";        $this -> componet -> Show();    }}$p = new Person("Brown");$bt = new BigTrouser();//$ts = new TShirts();$bt -> Decorate($p);$bt -> Show();//$ts->Decorate($bt);//$ts->Show();?>