计算图形的面积与周长-4

<?php

 class Result{

	private $shape=null;
	function __construct()
	{
		$this->shape=new $_GET['action']();
	}
	function __toString(){
		$result=$this->shape->shapeName.'的周长：'.round($this->shape->perimoter(),2).'<br>';
		$result.=$this->shape->shapeName.'的面积：'.round($this->shape->area(),2).'<br>';
		return $result;
	}
}