Use PHP to implement simple addition, subtraction, multiplication and division calculator functions-PHP Tutorial-php.cn

Use PHP to implement simple addition, subtraction, multiplication and division calculator functions

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Release： 2023-03-13 14:50:01

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Everyone must have used addition, subtraction, multiplication and division calculators. This article will introduce to you how to use PHP to implement

Calculators based on small programs written in PHP basic language

Requirements: Enter numbers in the input box to perform addition, subtraction, multiplication, and division operations (html+php)

Ideas:

1First create the input numbers and operators In the input box, use the text attribute of input for numbers, and the option attribute of selelct for operators

2. Click the = sign in the input box to perform the corresponding operation,

3 The input box with the = sign can be made using input's submit. Just click the submit form and the content will be passed to php

4 Determine the operator obtained from the html and perform the corresponding operation

5 After the operation is completed, the result must be returned to the form (that is, assigning a value to the form)

The code is as follows:

<?php 
header("content-type:text/html;charset=utf-8"); 
session_start(); 
?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-CN" dir="ltr"> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> 
<title>简单计算机</title> 
</head> 
<body> 
<form action="jisuan.php" method="post"> 
第一个数<input type="text" value="" name="num1"><br /> 
计算符号<select name="oper"> 
<option value="+">+</option> 
<option value="-">-</option> 
<option value="*">*</option> 
<option value="/">/</option> 
</select><br /> 
第二个数<input type="text" value="" name="num2"><br /> 
<input type="submit" value="计算结果"><br /> 
</form> 
</body> 
</html> 
<?php 
$num1=$_POST[&#39;num1&#39;]; 
$num2=$_POST[&#39;num2&#39;]; 
$oper=$_POST[&#39;oper&#39;]; 
$rs=0; 
switch($oper){ 
case "+": 
$rs=$num1+$num2; 
break; 
case "-": 
$rs=$num1-$num2; 
break; 
case "*": 
$rs=$num1*$num2; 
break; 
case "/": 
$rs=$num1/$num2; 
break; 
default: echo "您输入的不正确"; 
} 
$_SESSION[&#39;rs&#39;]=$rs; 
echo &#39;计算结果为：&#39;.$_SESSION[&#39;rs&#39;]; 
?>

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