width=$width;         $this->height=$height;     }     public function getArea(){
          return $this->width*$this->height;     }     public function getCircumference(){
          return 2*$this->width+2*$this->height;     } } /**  * 圆  */ class circle implements InterfaceShape{
      private $redius;     public function __construct($redius){
          $this->redius = $redius;     }     public function getArea(){
          return M_PI*pow($this->redius,2);     }     public function getCircumference(){
          return M*PI*2*$this->redius;     } } class FactoryShape{//func_get_arg(索引)返回当前函数指定索引的参数值，返回string格式；     static public function create(){
          switch (func_num_args()) {
              case 1:                 return new circle(func_get_arg(0));             case 2:                 return new Rectangle(func_get_arg(0),func_get_arg(1));             default:                 break;         }     } } $rect = FactoryShape::create(5,5); var_dump($rect); echo "
"; $circle = FactoryShape::create(4); var_dump($circle); ?>