刚刚学完php面向对象的编程，参考着高洛峰老师的php教程学习了这个实例。

效果图片：

以下是实现代码：index.php

图形计算(使用面向对象开发技术)

图形(周长&面积) 计算器

矩形

三角形

圆形

---

error_reporting(E_ALL & ~E_NOTICE);//提示错误的等级

// __autoload是php中的魔术方法，在用到类的时候自动调用

function __autoload($className){

//自动导入这个类

include strtolower($className).".class.php";

}

//输出表单，form类中有魔术方法__toString，因此可以直接输出类的对象引用，就是输出对象返回的字符串

echo new Form();

if(isset($_POST["sub"])){

//输出结果

echo new Result();//直接输出对象的引用表示

}

?>form.class.php_这是表单类_<?php

//根据index中提交的不同action的值返回不同的表单

class Form{

private $action; private $shape; //构造方法

function __construct($action=""){

$this->action = $action; $this->shape=isset($_REQUEST["action"])?$_REQUEST["action"]:"rect";

} function __toString()

{

// TODO: Implement __toString() method.

$form='

'; switch($this->shape){ case "rect": $form.=$this->getRect(); break; case "triangle": $form.=$this->getTriangle(); break; case "circle": $form.=$this->getCircle(); break; default: $form.='请选择一个形状
';

} $form.=''; $form.='

'; return $form;

} private function getRect(){

$input='请输入 | 矩形 | 的宽度和高度：

'; $input.='宽度：
'; $input.='高度：
'; $input.=''; return $input;

} private function getTriangle(){

$input='请输入 ｜ 三角形 ｜ 的三条边：

'; $input.='第一边:
'; $input.='第二边:
'; $input.='第三边:
'; $input.=''; return $input;

} private function getCircle(){

$input='请输入 ｜ 圆形 ｜ 的半径：

'; $input.='半径:
'; $input.=''; return $input;

}

}/**

* Created by PhpStorm.

* User: user

* Date: 2018/4/15

* Time: 16:26

*

*/shape.class.php 这是一个抽象类，用来定义规范的<?phpabstract class Shape {

public $shapeName; //规范circle、triangle、rect中必须有area()、perimeter()方法

abstract function area();

abstract function perimeter();

public function setShapeName($shapeName)

{

$this->shapeName = $shapeName; return $this;

} //判断输入的数字是否为大于0的有效数字

protected function validate($value, $message="形状"){

if($value == "" || !is_numeric($value) || $value < 0 ){ echo ' '.$message.' 必须为非负值的数字，并且不能为空
'; return false;

} else { return true;

}

}

}/**

* Created by PhpStorm.

* User: user

* Date: 2018/4/15

* Time: 16:42

*/circle.class.php_就是计算周长和面积的公式了_<?phpclass Circle extends Shape {

private $radius=0; function __construct(){

$this->shapeName="圆形"; if($this->validate($_POST['radius'], '圆的半径')){ $this->radius=$_POST["radius"];

}else{ exit;

}

} function area(){

return pi()*$this->radius*$this->radius;

} function perimeter(){

return 2*pi()*$this->radius;

}

}/**

* Created by PhpStorm.

* User: user

* Date: 2018/4/15

* Time: 17:06

*/rect.class.php<?phpclass Rect extends Shape{

private $width=0; private $height=0; function __construct()

{

$this->shapeName="矩形"; if($this->validate($_POST["width"],'矩形的宽度') & $this->validate($_POST["height"],'矩形的高度'))

{ $this->width=$_POST["width"]; $this->height=$_POST["height"];

} else{ exit;

}

} function area(){

return $this->width*$this->height;

} function perimeter()

{

return 2 * ($this->width + $this->height);

}

}/**

* Created by PhpStorm.

* User: user

* Date: 2018/4/15

* Time: 17:02

*/triangle.class.php<?phpclass Triangle extends Shape{

private $side1=0; private $side2=0; private $side3=0; function __construct(){

$this->shapeName="三角形"; if($this->validate($_POST['side1'], '三角形的第一个边')){ $this->side1=$_POST["side1"];

} if($this->validate($_POST['side2'], '三角形的第二个边')){ $this->side2=$_POST["side2"];

} if($this->validate($_POST['side3'], '三角形的第三个边')){ $this->side3=$_POST["side3"];

} if(!$this->validateSum()){ echo '三角形的两边之和必须大于第三边'; exit;

}

} function area(){

$s=( $this->side1+$this->side2+$this->side3 )/2; return sqrt( $s * ($s - $this->side1) * ($s - $this->side2) * ($s - $this->side3) );

} function perimeter(){

return $this->side1+$this->side2+$this->side3;

} private function validateSum()

{

$condition1 = ($this->side1 + $this->side2) > $this->side3; $condition2 = ($this->side1 + $this->side3) > $this->side2; $condition3 = ($this->side2 + $this->side3) > $this->side1; if ($condition1 && $condition2 && $condition3) { return true;

} else { return false;

}

}

}/**

* Created by PhpStorm.

* User: user

* Date: 2018/4/15

* Time: 17:04

*/result.class.php_这里是返回计算结果类_<?php

class Result{ private $shape;

function __construct()

{ switch($_POST['action']){ case 'rect':

$this->shape=new Rect(); break; case 'triangle':

$this->shape=new Triangle(); break; case 'circle':

$this->shape=new Circle(); break; default:

$this->shape=false;

}

} /**

* @return string

*/

function __toString()

{ // TODO: Implement __toString() method.

if($this->shape){

$result=$this->shape->shapeName.'的周长:'.$this->shape->perimeter().'
';

$result.=$this->shape->shapeName.'的面积:'.$this->shape->area().'
'; return $result;

}else{ return '没有这个形状';

}

}

}/**

* Created by PhpStorm.

* User: user

* Date: 2018/4/15

* Time: 16:47

*/

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