Backend Development
PHP Problem
Let us further understand the if statement of PHP flow control statement! ! ! (Source code attached)
Let us further understand the if statement of PHP flow control statement! ! ! (Source code attached)
The previous article introduced you to " Regarding the if conditional structure process of PHP process control, "Xiaobai" will continue to lead you to discuss ". This article continues to introduce to you the if statement of PHP process control statement. : Detailed explanation with pictures and text! ! !
Through the if statement we learned before, we use PHP to write a calculator to further describe the usage of the if statement:
The code is as follows:
<form action='' method='get'>
<input type="text" name="num1">
<select name="fh">
<option value="jia">+</option>
<option value="jian">-</option>
<option value="c">*</option>
<option value="chu">/</option>
<option value="qy">%</option>
</select>
<input type="text" name="num2">
<input type="submit" value="运算"/>
</form>
<?php
$num1 = $_GET['num1'];
$num2 = $_GET['num2'];
$fh =$_GET['fh'];
if(!is_numeric($num1) || !is_numeric
($num2)){
echo '请输入数值类型';
}
if($fh=='jia'){
echo $num1 . '+' . $num2 . '=' .
($num1+$num2);
}
if($fh=='jian'){
echo $num1 . '-' . $num2 . '=' .
($num1-$num2);
}
if($fh=='c'){
echo $num1 . '*' . $num2 . '=' .
($num1*$num2);
}
if($fh=='chu'){
echo $num1 . '/' . $num2 . '=' .
($num1/$num2);
}
if($fh=='qy'){
echo $num1 . '%' . $num2 . '=' .
($num1%$num2);
}
?>The running results are as follows:
Recommended learning: "PHP Video Tutorial"
The above is the detailed content of Let us further understand the if statement of PHP flow control statement! ! ! (Source code attached). For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1377
52
PHP 8 JIT (Just-In-Time) Compilation: How it improves performance.
Mar 25, 2025 am 10:37 AM
PHP 8's JIT compilation enhances performance by compiling frequently executed code into machine code, benefiting applications with heavy computations and reducing execution times.
PHP Secure File Uploads: Preventing file-related vulnerabilities.
Mar 26, 2025 pm 04:18 PM
The article discusses securing PHP file uploads to prevent vulnerabilities like code injection. It focuses on file type validation, secure storage, and error handling to enhance application security.
OWASP Top 10 PHP: Describe and mitigate common vulnerabilities.
Mar 26, 2025 pm 04:13 PM
The article discusses OWASP Top 10 vulnerabilities in PHP and mitigation strategies. Key issues include injection, broken authentication, and XSS, with recommended tools for monitoring and securing PHP applications.
What is the purpose of prepared statements in PHP?
Mar 20, 2025 pm 04:47 PM
Prepared statements in PHP enhance database security and efficiency by preventing SQL injection and improving query performance through compilation and reuse.Character count: 159
PHP Encryption: Symmetric vs. asymmetric encryption.
Mar 25, 2025 pm 03:12 PM
The article discusses symmetric and asymmetric encryption in PHP, comparing their suitability, performance, and security differences. Symmetric encryption is faster and suited for bulk data, while asymmetric is used for secure key exchange.
How do you retrieve data from a database using PHP?
Mar 20, 2025 pm 04:57 PM
Article discusses retrieving data from databases using PHP, covering steps, security measures, optimization techniques, and common errors with solutions.Character count: 159
PHP API Rate Limiting: Implementation strategies.
Mar 26, 2025 pm 04:16 PM
The article discusses strategies for implementing API rate limiting in PHP, including algorithms like Token Bucket and Leaky Bucket, and using libraries like symfony/rate-limiter. It also covers monitoring, dynamically adjusting rate limits, and hand
PHP Authentication & Authorization: Secure implementation.
Mar 25, 2025 pm 03:06 PM
The article discusses implementing robust authentication and authorization in PHP to prevent unauthorized access, detailing best practices and recommending security-enhancing tools.
