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PHP Academy · Lesson

Handling Form Data with PHP

Capture and process form data using PHP.

Handling Form Data with PHP is a free PHP Academy lesson on CoddyKit — lesson 2 of 3. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the PHP Academy learning path, one of 3 lessons in the course, and your progress syncs across the web and the CoddyKit app.

1

Handling Form Data with PHP

Welcome to the next lesson! In this lesson, you’ll learn how to process data submitted through HTML forms using PHP. Let’s dive in and make your forms functional!

Handling Form Data with PHP — illustration 1

2

How PHP Handles Form Data

When a user submits a form, the data is sent to a PHP script specified in the form's action attribute. PHP processes this data using $_GET or $_POST superglobals.

Key Point: Use $_POST for sensitive data and $_GET for non-sensitive data that can appear in the URL.

3

Using the $_POST Superglobal

The $_POST array stores data sent via the HTTP POST method. Example:

Task: Create a form to collect a user’s name and display a greeting using PHP.

<?php
  if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    echo "Hello, $name!";
  }
?>

4

Using the $_GET Superglobal

The $_GET array stores data sent via the HTTP GET method. Example:

Tip: Use $_GET for retrieving data like search queries or pagination.

<?php
  if ($_SERVER["REQUEST_METHOD"] == "GET") {
    $query = $_GET["search"];
    echo "You searched for: $query";
  }
?>

5

Form Validation Basics

Before processing form data, validate it to ensure it’s safe and accurate. Example:

Tip: Always validate user input to prevent errors and security issues.

<?php
  if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $email = $_POST["email"];
    if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
      echo "Valid email: $email";
    } else {
      echo "Invalid email address.";
    }
  }
?>

6

Displaying Submitted Data

After validating data, display it back to the user or use it in your application. Example:

Key Point: Use htmlspecialchars() to escape special characters and prevent XSS attacks.

<?php
  if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = htmlspecialchars($_POST["name"]);
    echo "Thank you, $name!";
  }
?>

7

Handling Multiple Inputs

Use arrays to handle multiple inputs, such as checkboxes. Example:

<?php
  if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $hobbies = $_POST["hobbies"];
    echo "Your hobbies are: " . implode(", ", $hobbies);
  }
?>

8

Common Pitfalls

Watch out for these common mistakes when handling form data:

  • Not checking the request method.
  • Forgetting to validate user input.
  • Directly echoing user input without escaping it.

Tip: Always sanitize and validate data before using it in your application.

9

10

Great Job!

Congratulations! You’ve learned how to handle form data in PHP using the $_POST and $_GET superglobals. You also explored basic form validation techniques. In the next lesson, we’ll dive deeper into validating and securing form inputs. Let’s keep coding!

Handling Form Data with PHP — illustration 10

Frequently asked questions

Is the “Handling Form Data with PHP” lesson free?

Yes — the full text of “Handling Form Data with PHP” is free to read here on the web, and the PHP Academy course includes 3 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the PHP Academy course, upgrade to CoddyKit PRO.

What will I learn in “Handling Form Data with PHP”?

Capture and process form data using PHP. You practise PHP Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.

Do I need any experience to start PHP Academy?

No prior experience is required. PHP Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 2 of 3, so you can start here or from the beginning and move at your own pace.

How long does the “Handling Form Data with PHP” lesson take?

Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.

Can I write and run code in this PHP Academy lesson?

Yes. Every PHP Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.

All lessons in this course

  1. Creating HTML Forms
  2. Handling Form Data with PHP
  3. Form Validation
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