PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles-PHP Tutorial-php.cn

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PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles

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Apr 21, 2018 pm 01:50 PM

php practise calculate

I just finished learning PHP object-oriented programming and learned this example with reference to teacher Gao Luofeng's PHP tutorial.

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PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles

##The following is the implementation code:

index.php

<html><head>
    <title>图形计算（使用面向对象开发技术）</title>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body>
    <center>
        <h1 id="图形-周长-面积-nbsp-计算器">图形（周长&面积） 计算器</h1>
        <a href="index.php?action=rect">PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles</a>
        <a href="index.php?action=triangle">PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles</a>
        <a href="index.php?action=circle">PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles</a>
        <hr>
    </center>


    <?php  //php代码部分
        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
        }

    ?></body></html>

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form.class.php_This is the form class_

<?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.
            $form=&#39;<form action="&#39;.$this->action.&#39;"  method="post">&#39;;            switch($this->shape){                case "rect":                    $form.=$this->getRect();                    break;                case "triangle":                    $form.=$this->getTriangle();                    break;                case "circle":                    $form.=$this->getCircle();                    break;                default:                    $form.=&#39;请选择一个形状<br>&#39;;
            }            $form.=&#39;<input type="submit" name="sub" value="计算">&#39;;            $form.=&#39;</form>&#39;;            return $form;
        }        private function getRect(){
            $input=&#39;<b>请输入 | PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles | 的宽度和高度：</b><p>&#39;;            $input.=&#39;宽度：<input type="text" name="width" value="&#39;.$_POST[&#39;width&#39;].&#39;"><br>&#39;;            $input.=&#39;高度：<input type="text" name="height" value="&#39;.$_POST[&#39;height&#39;].&#39;"><br>&#39;;            $input.=&#39;<input type="hidden" name="action" value="rect">&#39;;            return $input;
        }        private function getTriangle(){
            $input=&#39;<b>请输入 ｜ PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles ｜ 的三条边：</b><p>&#39;;            $input.=&#39;第一边: <input type="text" name="side1" value="&#39;.$_POST[&#39;side1&#39;].&#39;" ><br>&#39;;            $input.=&#39;第二边: <input type="text" name="side2" value="&#39;.$_POST[&#39;side2&#39;].&#39;" ><br>&#39;;            $input.=&#39;第三边: <input type="text" name="side3" value="&#39;.$_POST[&#39;side3&#39;].&#39;" ><br>&#39;;            $input.=&#39;<input type="hidden" name="action" value="triangle">&#39;;            return $input;
        }        private function getCircle(){
            $input=&#39;<b>请输入 ｜ PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles ｜ 的半径：</b><p>&#39;;            $input.=&#39;半径: <input type="text" name="radius" value="&#39;.$_POST[&#39;radius&#39;].&#39;" ><br>&#39;;            $input.=&#39;<input type="hidden" name="action" value="circle">&#39;;            return $input;
        }

    }/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/4/15
 * Time: 16:26
 *
 */

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shape.class.php

This is an abstract class used to define specifications

<?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) || $value < 0 ){            echo &#39;<font color="red"> &#39;.$message.&#39; 必须为非负值的数字，并且不能为空 </font><br>&#39;;            return false;
        } else {            return true;
        }
    }
}/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/4/15
 * Time: 16:42
 */

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circle.class.php_It is the formula for calculating perimeter and area_

<?phpclass Circle extends Shape {
    private $radius=0;    function __construct(){
        $this->shapeName="PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles";        if($this->validate($_POST[&#39;radius&#39;], &#39;圆的半径&#39;)){            $this->radius=$_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
 */

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rect.class.php

<?phpclass Rect extends Shape{
    private $width=0;    private $height=0;    function __construct()
    {
        $this->shapeName="PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles";        if($this->validate($_POST["width"],&#39;PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles的宽度&#39;) & $this->validate($_POST["height"],&#39;PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles的高度&#39;))
        {            $this->width=$_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
 */

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triangle.class.php

<?phpclass Triangle extends Shape{
    private $side1=0;    private $side2=0;    private $side3=0;    function __construct(){
        $this->shapeName="PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles";        if($this->validate($_POST[&#39;side1&#39;], &#39;PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles的第一个边&#39;)){            $this->side1=$_POST["side1"];
        }        if($this->validate($_POST[&#39;side2&#39;], &#39;PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles的第二个边&#39;)){            $this->side2=$_POST["side2"];

        }        if($this->validate($_POST[&#39;side3&#39;], &#39;PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles的第三个边&#39;)){            $this->side3=$_POST["side3"];
        }        if(!$this->validateSum()){            echo &#39;<font color="red">PHP object-oriented programming exercises: Calculate the perimeter and area of rectangles, triangles, and circles的两边之和必须大于第三边</font>&#39;;            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
 */

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result.class.php_Here is the return calculation result class_

<?php
    class Result{        private $shape;

        function __construct()
        {            switch($_POST[&#39;action&#39;]){                case &#39;rect&#39;:
                    $this->shape=new Rect();                    break;                case &#39;triangle&#39;:
                    $this->shape=new Triangle();                    break;                case &#39;circle&#39;:
                    $this->shape=new Circle();                    break;                default:
                    $this->shape=false;
            }
        }        /**
         * @return string
         */
        function __toString()
        {            // TODO: Implement __toString() method.
            if($this->shape){
                $result=$this->shape->shapeName.&#39;的周长:&#39;.$this->shape->perimeter().&#39;<br>&#39;;
                $result.=$this->shape->shapeName.&#39;的面积:&#39;.$this->shape->area().&#39;<br>&#39;;                return $result;
            }else{                return &#39;没有这个形状&#39;;
            }
        }
    }/**
 * Created by PhpStorm.
 * User: user
 * Date: 2018/4/15
 * Time: 16:47
 */

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