剛剛學(xué)完phphtml' target='_blank'>面向?qū)ο?/u>的編程，參考著高洛峰老師的php教程學(xué)習(xí)了這個(gè)實(shí)例。
效果圖片：
<html><head> <title>圖形計(jì)算（使用面向?qū)ο箝_發(fā)技術(shù)）</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body> <center> <h1>圖形（周長(zhǎng)&面積） 計(jì)算器</h1> <a href="index.php?action=rect">矩形</a> <a href="index.php?action=triangle">三角形</a> <a href="index.php?action=circle">圓形</a> <hr> </center> <?php //php代碼部分 error_reporting(E_ALL & ~E_NOTICE);//提示錯(cuò)誤的等級(jí) // __autoload是php中的魔術(shù)方法，在用到類的時(shí)候自動(dòng)調(diào)用 function __autoload($className){ //自動(dòng)導(dǎo)入這個(gè)類 include strtolower($className).".class.php"; } //輸出表單，form類中有魔術(shù)方法__toString，因此可以直接輸出類的對(duì)象引用，就是輸出對(duì)象返回的字符串 echo new Form(); if(isset($_POST["sub"])){ //輸出結(jié)果 echo new Result();//直接輸出對(duì)象的引用表示 } ?></body></html>form.class.php_這是表單類_
<?php //根據(jù)index中提交的不同action的值返回不同的表單 class Form{ private $action; private $shape; //構(gòu)造方法 function __construct($action=""){ $this->action = $action; $this->shape=isset($_REQUEST["action"])?$_REQUEST["action"]:"rect"; } function __toString() { // TODO: Implement __toString() method. $form='<form action="'.$this->action.'" method="post">'; switch($this->shape){ case "rect": $form.=$this->getRect(); break; case "triangle": $form.=$this->getTriangle(); break; case "circle": $form.=$this->getCircle(); break; default: $form.='請(qǐng)選擇一個(gè)形狀<br>'; } $form.='<input type="submit" name="sub" value="計(jì)算">'; $form.='</form>'; return $form; } private function getRect(){ $input='<b>請(qǐng)輸入 | 矩形 | 的寬度和高度：</b><p>'; $input.='寬度：<input type="text" name="width" value="'.$_POST['width'].'"><br>'; $input.='高度：<input type="text" name="height" value="'.$_POST['height'].'"><br>'; $input.='<input type="hidden" name="action" value="rect">'; return $input; } private function getTriangle(){ $input='<b>請(qǐng)輸入 ｜ 三角形 ｜ 的三條邊：</b><p>'; $input.='第一邊: <input type="text" name="side1" value="'.$_POST['side1'].'" ><br>'; $input.='第二邊: <input type="text" name="side2" value="'.$_POST['side2'].'" ><br>'; $input.='第三邊: <input type="text" name="side3" value="'.$_POST['side3'].'" ><br>'; $input.='<input type="hidden" name="action" value="triangle">'; return $input; } private function getCircle(){ $input='<b>請(qǐng)輸入 ｜ 圓形 ｜ 的半徑：</b><p>'; $input.='半徑: <input type="text" name="radius" value="'.$_POST['radius'].'" ><br>'; $input.='<input type="hidden" name="action" value="circle">'; return $input; } }/** * Created by PhpStorm. * User: user * Date: 2018/4/15 * Time: 16:26 * */shape.class.php 這是一個(gè)抽象類，用來定義規(guī)范的<?phpabstract class Shape { public $shapeName; //規(guī)范circle、triangle、rect中必須有area()、perimeter()方法 abstract function area(); abstract function perimeter(); public function setShapeName($shapeName) { $this->shapeName = $shapeName; return $this; } //判斷輸入的數(shù)字是否為大于0的有效數(shù)字 protected function validate($value, $message="形狀"){ if($value == "" || !is_numeric($value) || $value < 0 ){ echo '<font color="red"> '.$message.' 必須為非負(fù)值的數(shù)字，并且不能為空 </font><br>'; return false; } else { return true; } }}/** * Created by PhpStorm. * User: user * Date: 2018/4/15 * Time: 16:42 */circle.class.php_就是計(jì)算周長(zhǎng)和面積的公式了_<?phpclass Circle extends Shape { private $radius=0; function __construct(){ $this->shapeName="圓形"; if($this->validate($_POST['radius'], '圓的半徑')){ $this->radius=$_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"],'矩形的寬度') & $this->validate($_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'], '三角形的第一個(gè)邊')){ $this->side1=$_POST["side1"]; } if($this->validate($_POST['side2'], '三角形的第二個(gè)邊')){ $this->side2=$_POST["side2"]; } if($this->validate($_POST['side3'], '三角形的第三個(gè)邊')){ $this->side3=$_POST["side3"]; } if(!$this->validateSum()){ echo '<font color="red">三角形的兩邊之和必須大于第三邊</font>'; 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_這里是返回計(jì)算結(jié)果類_<?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.'的周長(zhǎng):'.$this->shape->perimeter().'<br>'; $result.=$this->shape->shapeName.'的面積:'.$this->shape->area().'<br>'; return $result; }else{ return '沒有這個(gè)形狀'; } } }/** * Created by PhpStorm. * User: user * Date: 2018/4/15 * Time: 16:47 */相關(guān)推薦：
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