class Database { private static $instance = null; private function __construct() {} public static function getInstance() { if (!self::$instance) { self::$instance = new Database(); } return self::$instance; } } $database = Database::getInstance();
class Logger { private static $instance = null; private function __construct() {} public static function getInstance() { if (!self::$instance) { self::$instance = new Logger(); } return self::$instance; } } $logger = Logger::getInstance();The `getInstance()` method is commonly used in many PHP libraries and APIs, including Laravel, Symfony, and Zend Framework. However, it is not part of a specific package library, as it is a design pattern that can be implemented in different ways depending on the developer's preferences and needs.