How can session variables be effectively utilized in a multi-page form to track progress and prevent users from going back to previous steps?

To effectively utilize session variables in a multi-page form to track progress and prevent users from going back to previous steps, you can set a session variable for each step of the form and check the session variable before allowing the user to proceed to the next step. By updating the session variable as the user progresses through the form, you can ensure that they cannot go back to previous steps. 

<?php
session_start();

// Check if user has completed previous steps
if (!isset($_SESSION['step1'])) {
    header('Location: step1.php');
    exit;
}

// Process form submission for step 2
if ($_SERVER['REQUEST_METHOD'] == 'POST' && isset($_POST['submit_step2'])) {
    // Validate and process form data for step 2

    // Update session variable for step 2
    $_SESSION['step2'] = true;

    header('Location: step3.php');
    exit;
}
?>

Keywords

session variables multi-page form progress tracking prevent users navigation control

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