How can one securely implement a user verification system on a website to assign server groups in Teamspeak³ using PHP?

To securely implement a user verification system on a website to assign server groups in Teamspeak³ using PHP, you can use a combination of user authentication, session management, and database queries to validate the user's credentials and assign the appropriate server group based on their permissions.

// Start a session
session_start();

// Check if the user is logged in
if(isset($_SESSION['user_id'])) {
    // Validate user credentials and retrieve their permissions from the database
    $user_id = $_SESSION['user_id'];
    
    // Assign server group based on user permissions
    if($user_permissions == 'admin') {
        // Assign admin server group
        $server_group = 'Admin';
    } elseif($user_permissions == 'moderator') {
        // Assign moderator server group
        $server_group = 'Moderator';
    } else {
        // Assign default server group
        $server_group = 'Default';
    }
} else {
    // Redirect user to login page if not logged in
    header('Location: login.php');
    exit();
}