class User { private static $instance; private function __construct() { // constructor code here } public static function getInstance() { if (!isset(self::$instance)) { self::$instance = new User(); } return self::$instance; } public function someMethod() { // method code here } }In this code, the User class has a private static $instance property and a private constructor, meaning only one instance of the User class can exist. The getInstance() method is used to create or access the existing instance of the User object. A common scenario where the User singleton pattern can be used is when you have a user that needs to remain logged in as they navigate through different pages of your application. By implementing the User singleton, you can ensure that any changes made to the user object are persisted across pages. The User singleton pattern can be found in many PHP package libraries, including the Laravel framework, CodeIgniter, and Symfony.