Chapter 18: Form Data in PHP

Handle URL-encoded form submissions. In this chapter, you will learn form data in depth with PHP code examples, explanations, and best practices.

Overview

This chapter covers form data for Kungfu.js developers using PHP. We will start with the basics, move through practical examples, and end with advanced techniques and common pitfalls.

Why This Matters

Understanding form data is essential because it is a core part of building web applications. Every real-world app needs to handle handle url-encoded form submissions. Skipping this chapter would leave a gap in your knowledge that would cause problems later.

Code Example

Here is how to handle requests and responses in PHP:

// Handle form submission
app.post('/login', (req) => {
    // req.body contains URL-encoded form data
    const params = new URLSearchParams(req.body);
    const email = params.get('email');
    const password = params.get('password');
    
    return { status: 200, body: 'Logged in' };
});

Common Mistakes

• Not reading the documentation: Always check the API reference when something does not work as expected.
• Skipping security: Never disable the default middleware unless you have a very good reason. Security is not optional.
• Not testing: Write tests for your handlers. Kungfu.js makes this easy with the built-in test utilities.

Summary

In this chapter, you learned about form data in PHP. You saw code examples, understood how things work under the hood, and learned about common mistakes to avoid.

What is Next?

In chapter 19, we will cover File Uploads: Multipart form data and file handling.