How can one troubleshoot login issues in PHP admin menus?

To troubleshoot login issues in PHP admin menus, you can check if the login credentials are correct, ensure that the session is being properly handled, and verify that the user has the necessary permissions to access the admin menu.

// Check if the login credentials are correct
if($username === 'admin' && $password === 'password'){
    // Start the session
    session_start();
    // Set a session variable to indicate the user is logged in
    $_SESSION['logged_in'] = true;
    // Redirect the user to the admin menu page
    header('Location: admin_menu.php');
    exit;
} else {
    // Display an error message if the credentials are incorrect
    echo 'Invalid username or password';
}