decoratedShape = $decoratedShape;    }    //类似递归    public function draw()    {        $this->decoratedShape->draw();    }}//step 4 创建拓展ShapeDecorator类的实体装饰类class RedShapeDecortor extends ShapeDecorator{    function __construct(Shape $decoratedShape)    {        $this->decoratedShape = $decoratedShape;    }    public function draw()    {        parent::draw();//        throw new Exception("Exception End ： Border Color: Red\n");        printf("Border Color: Red\n");    }}class GreenShapeDecortor extends ShapeDecorator{    function __construct(Shape $decoratedShape)    {        $this->decoratedShape = $decoratedShape;    }    public function draw()    {        parent::draw();        throw new Exception("Exception End ： Border Color: Green\n");        printf("Border Color: Green\n");    }}class BlueShapeDecortor extends ShapeDecorator{    function __construct(Shape $decoratedShape)    {        $this->decoratedShape = $decoratedShape;    }    public function draw()    {        parent::draw();        printf("Border Color: Blue\n");    }}function main(){    //画圈圈//    $circle = new Circle();////    //画圈圈初始化，搭配颜色装饰画红色，接着再装饰一个绿色。//    $shapeDecortor = new RedShapeDecortor($circle);//    $shapeDecortor = new GreenShapeDecortor($shapeDecortor);//    $shapeDecortor->draw();    //优点，类内部可使用异常中断。    //画矩形    $rectangle = new Rectangle();    //画矩初始化，搭配颜色装饰画红色，接着再装饰一个绿色。    $shapeDecortor = new RedShapeDecortor($rectangle);    $shapeDecortor = new GreenShapeDecortor($shapeDecortor);    $shapeDecortor = new BlueShapeDecortor($shapeDecortor);    try {        $shapeDecortor->draw();    } catch (Exception $e) {        printf($e->getMessage() . "\n");    }    //todo 拓展：可再配合工厂模式，生产装饰器。}main();

输出结果：