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The previous article introduced to you "What interfaces are there in PHP? how to use? 》, this article continues to introduce to you how to use PHP to edit a simple graphing calculator? It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.
Simple graphing calculator:
First we create a simple HTML page, give a tag in the HTML, and write us For the graphics to be used, we will find that the running results are as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>简单的图形计算器</title>
</head>
<body>
<h1>简单的图形计算器</h1>
<a href="">矩形</a> ||
<a href="">三角形</a>
</body>
</html>The running results are as follows
Then we set the attributes (style), and then in the body Enter text in to achieve a centered effect.
<style>
body{
text-align:center;
}
</style>In order to accomplish what we want to achieve, we create a new abstract class (class.php). The abstract class we create is to define functions for subclasses. We need to define the name of the shape, the verification method of the shape, the form page of the shape graphic, the area calculation method of the shape, and the perimeter method of the shape calculation. Our rules are ready. The code is as follows:
<?php
//抽象类
//为其他类定义要求
abstract cLass Shape{
//形状的名称
public $name;
//形状验证的方法
abstract function yan( array $arr ) ;
//形状图形的表单页面
abstract function view();
//形状计算面积方法
abstract function area() ;
//形状计算周长方法
abstract function zhou( ) ;
} Then we return to the code just now. When we click on the rectangle, we have to create the rectangle class,
and then call the content inside accordingly. The code is as follows:
<body>
<h1>简单的图形计算器</h1>
<a href="1.php?action=rect">矩形</a> ||
<a href="1.php?action=triangle">三角形</a>
<hr/>
<br/>
</body>The code is as follows:
#So we make a judgment that the get in the if conditional sentence is not empty, then we can design or create a shape object. If it is empty, please Select a calculated graphic, the code is as follows:
<?php
if(!empty($_GET['action'])){
// 创建形状对象
}else{
//如果用户没有点击链接， 则默认访问这里
echo '请选择一个要计算的图形';
?>The code is as follows:
If we want to create it, we must first get the name of the rectangle,
$classname = ucfirst($_GET[ ' action']);
//通过类名创建图形对象
$shape = new $classname ;
if ($shape instanceof Shape){
//正常操作
}else{
echo '必须按照要求来执行' ;
}
var_dump($shape); 
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