How can PHP sessions be managed to differentiate between normal users and admin users in a web interface?

To differentiate between normal users and admin users in a web interface using PHP sessions, you can set a session variable upon login that identifies the user as either a normal user or an admin user. This session variable can then be checked on each page to determine the user's role and display appropriate content or restrict access accordingly.

// Upon login, set a session variable to identify the user as an admin or normal user
$_SESSION['user_role'] = 'admin'; // or 'normal_user'

// Check the session variable on each page to differentiate between admin and normal users
if($_SESSION['user_role'] == 'admin'){
    // Display admin-specific content or allow admin-specific actions
} else {
    // Display normal user content or restrict access for normal users
}