How can PHP sessions be effectively used to store form data and prevent data loss during navigation between form pages?

When navigating between form pages, PHP sessions can be effectively used to store form data and prevent data loss. By storing form data in session variables, the data will persist as the user moves between pages. This ensures that the user's input is not lost during the navigation process.

// Start the session
session_start();

// Store form data in session variables
$_SESSION['form_data'] = $_POST;

// Retrieve form data from session variables
if(isset($_SESSION['form_data'])) {
    $form_data = $_SESSION['form_data'];
    // Use $form_data to pre-fill form fields
}