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这篇文章主要介绍PHP实现简易图形计算器的案例，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！
PHP实现简易图形计算器的具体代码如下
主函数：index.php
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>图形计算器</title>
<style>
* {
margin: 0px;
padding: 0px;
}
#contains {
width: 500px;
margin: 20px auto;
background: #0C0;
text-align: center;
}
h2 {
width: 500px;
height: 60px;
}
a {
font-size: 20px;
text-decoration: none;
}
#footer {
width: 300px;
background: #fff;
margin: 0 auto;
padding: 5px 10px;
border-radius: 150px;
}
</style>
</head>
<body>
<div id="contains">
<h2>简易图形计算器</h2>
<a href='index.php?action=rect'>矩形</a> |
<a href='index.php?action=triangle'>三角形</a>|
<a href='index.php?action=cirle'>圆形</a>
<hr>
<?php
ini_set("display_errors", "On"); //开启错误调试
//设置错误报告的级别，除了无关紧要的'注意'，其他的报告都输出
error_reporting(E_ALL & ~E_NOTICE);
function __autoload($classname) { //魔术方法 自动加载类
include strtolower($classname).".class.php"; //将类名转化成小写
}
// include "shape.class.php";
// include "rect.class.php";
if (!empty($_GET['action'])) {
// echo "传送成功";
$classname = ucfirst($_GET['action']);
$shape = new $classname($_POST);
$shape->view($_POST);
if (isset($_POST['sub'])) {
echo "<div id='footer'>";
if ($shape->yan($_POST)) {
echo "<b>".$shape->name."的周长".$shape->zhou()."</b>"."<br>";
echo "<br>";
echo "<b>".$shape->name."的面积".$shape->area()."</b>"."<br>";
}else {
echo "<b>错误：$shape->error</b>";
}
echo "</div>";
}
} else {
echo "请选择一个图形";
}
?>
</div>
</body>
</html>先定义一个抽象类
<?php
abstract class Shape {
private $name;
private $error;
abstract function area();
abstract function zhou();
abstract function view($arr);
abstract function yan($arr);
}
?>矩形类的编写
<?php
class Rect extends Shape {
private $width;
private $height;
function __construct($arr = array()) {
if (!empty($arr)) {
$this->width = $arr['width'];
$this->height = $arr['height'];
}
$this->name = "矩形";
$this->error = '';
}
function area() {
return $this->width * $this->height;
}
function zhou() {
return ($this->width+$this->height) * 2;
}
function view($arr) {
$form .= "<form action='index.php?action=rect' method='post'>";
$form .= "请输入".$arr['name']."的宽度：<input type='text' name='width' value='".$_POST['width']."'/><br>";
$form .= "<br>";
$form .= "请输入".$arr['name']."的长度：<input type='text' name='height' value='".$_POST['height']."'/><br>";
$form .= "<br>";
$form .= "<input type='submit' name='sub' value='提交'/> ";
$form .= "<input type='reset' name='ret' value='重置'/>";
$form .= "</form>";
echo $form;
}
function yan($arr) {
$bz = true;
if ($arr['width']< 0) {
$this->error .= "宽度小于0；";
$bz = false;
} else {
if (!is_numeric($arr['width'])) {
$this->error .= "宽不是数字；";
$bz = false;
}
}
if ($arr['height']< 0) {
$this->error .= "宽度小于0；";
$bz = false;
} else {
if (!is_numeric($arr['height'])) {
$this->error .= "高不是数字；";
$bz = false;
}
}
return $bz;
}
}
?>三角形类：
<?php
class Triangle extends Shape {
private $bian1;
private $bian2;
private $bian3;
function __construct($arr = array()) {
if (!empty($arr)) {
$this->bian1 = $arr['bian1'];
$this->bian2 = $arr['bian2'];
$this->bian3 = $arr['bian3'];
}
$this->name = "三角形";
$this->error = '';
}
function area() {
$p = ($this->bian1 + $this->bian2 + $this->bian3) / 2;
// p(p-a)(p-b)(p-c)
return sqrt($p*($p-$this->bian1)*($p-$this->bian2)*($p-$this->bian3));
}
function zhou() {
return $this->bian1+$this->bian2+$this->bian3;
}
function view($arr) {
$form .= "<form action='index.php?action=triangle' method='post'>";
$form .= "请输入".$arr['name']."的第一条边：<input type='text' name='bian1' value='".$_POST['bian1']."'/><br>";
$form .= "<br>";
$form .= "请输入".$arr['name']."的第二条边：<input type='text' name='bian2' value='".$_POST['bian2']."'/><br>";
$form .= "<br>";
$form .= "请输入".$arr['name']."的第三条边：<input type='text' name='bian3' value='".$_POST['bian3']."'/><br>";
$form .= "<br>";
$form .= "<input type='submit' name='sub' value='提交'/> ";
$form .= "<input type='reset' name='ret' value='重置'/>";
$form .= "</form>";
echo $form;
}
function yan($arr) {
$bz = true;
if ($arr['bian1']< 0) {
$this->error .= "第一条边小于0；";
$bz = false;
} else {
if (!is_numeric($arr['bian1'])) {
$this->error .= "第一条边不是数字；";
$bz = false;
}
}
if ($arr['bian2']< 0) {
$this->error .= "第二条边小0；";
$bz = false;
} else {
if (!is_numeric($arr['bian2'])) {
$this->error .= "第二条边不是数字；";
$bz = false;
}
}
if ($arr['bian2']< 0) {
$this->error .= "第三条边小于0；";
$bz = false;
} else {
if (!is_numeric($arr['bian2'])) {
$this->error .= "第三条边不是数字；";
$bz = false;
}
}
if (($this->bian1+$this->bian2) < $this->bian3 ||($this->bian1+$this->bian3) < $this->bian2 ||($this->bian2+$this->bian3) < $this->bian1) {
$this->error .= "三条边不能构成三角形";
$bz = false;
}
return $bz;
}
}
?>其他的类只要按照上面的格式改下就很好写出来了。
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