What potential pitfalls should be considered when creating a multi-page form in PHP?

One potential pitfall when creating a multi-page form in PHP is losing form data when navigating between pages. To prevent this, you can store the form data in session variables and retrieve them on each page load. This ensures that the user's input is preserved throughout the form submission process. 

```php
// Start the session
session_start();

// Check if form data has been submitted
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // Store form data in session variables
    $_SESSION['form_data'] = $_POST;
    
    // Redirect to the next page
    header('Location: page2.php');
    exit;
}

// Retrieve form data from session variables
$form_data = isset($_SESSION['form_data']) ? $_SESSION['form_data'] : array();
```
This code snippet demonstrates how to store form data in session variables and retrieve them on subsequent pages to ensure data persistence in a multi-page form.

Keywords

validation session management form submission data handling security

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