In what scenarios would it be recommended to allow guest users to interact with a website's functionality without requiring registration?

Allowing guest users to interact with a website's functionality without requiring registration can be beneficial in scenarios where quick access or temporary use is desired, such as for browsing products, accessing basic information, or trying out a demo. This can improve user experience by reducing barriers to entry and increasing engagement.

// Check if user is a guest or logged in
if(is_guest_user()) {
    // Allow guest user to interact with website functionality
    // Code for guest user interaction here
} else {
    // Require registration or login for full access
    // Redirect to registration or login page
    header("Location: login.php");
    exit();
}