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How to implement addition, subtraction, multiplication and division in php
- PHPzOriginal
- 2023-03-29 10:09:57775browse
PHP is a widely used server-side scripting language that can be used to develop web applications. It is a powerful and flexible language that can be used to implement various types of applications. This article will introduce how to use PHP to write a simple addition, subtraction, multiplication and division machine.
- Preparation
Before you start writing PHP addition, subtraction, multiplication and division, you need to install the PHP environment first. You can download the PHP installation package from the PHP official website (https://www.php.net/) and follow the prompts to install it. Once installed, you will need a text editor to write PHP code. Windows users can use Notepad or Notepad , while Mac users can use TextEdit.
- Write PHP addition, subtraction, multiplication and division code
Next, we will start writing PHP addition, subtraction, multiplication and division code. The following is the basic structure of the program:
<!DOCTYPE html>
<html>
<head>
<title>PHP Calculator</title>
</head>
<body>
<?php
if(isset($_POST['submit'])) {
$num1 = $_POST['num1'];
$num2 = $_POST['num2'];
$operator = $_POST['operator'];
$result = '';
switch($operator) {
case 'add':
$result = $num1 + $num2;
break;
case 'subtract':
$result = $num1 - $num2;
break;
case 'multiply':
$result = $num1 * $num2;
break;
case 'divide':
if($num2 == 0) {
$result = '无法除以零';
} else {
$result = $num1 / $num2;
}
break;
default:
$result = '';
break;
}
}
?>
<h2>PHP Calculator</h2>
<form method="post" action="">
<input type="number" name="num1" value="<?php echo $num1; ?>" />
<select name="operator">
<option value="add">加</option>
<option value="subtract">减</option>
<option value="multiply">乘</option>
<option value="divide">除</option>
</select>
<input type="number" name="num2" value="<?php echo $num2; ?>" />
<input type="submit" name="submit" value="计算" />
</form>
<?php if(isset($_POST['submit'])) { ?>
<h4>结果：<?php echo $result; ?></h4>
<?php } ?>
</body>
</html>
The above code contains the following parts:
• Form element: This part defines the user interface, which contains two input boxes and a drop-down The list box is used to select operators.
• PHP script: This part handles form submission, performs corresponding operations and displays the results on the page.
• Result element: This part displays the result of the operation.
- Run the PHP addition, subtraction, multiplication and divider
Once you have finished writing the PHP addition, subtraction, multiplication and divider, you need to save the code to a file with a .php extension name in the file. Upload the file to your web server root directory or copy the file to your local computer and run the program using web server software such as Apache. You can then run it by opening a web browser and visiting the program's address.
- Summary
In this article, we introduced how to write a simple addition, subtraction, multiplication and divider using PHP. This program demonstrates how to use form elements to collect user input and use a PHP script to perform the corresponding operations. The code given serves as a foundation upon which you can build more complex web applications.
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