Singleton Design Pattern

<?phpnamespace DesignPatterns\Singleton;/** * The Singleton class will have a `GetInstance` method that serves as a way * of creating or returning the instance of the object */class Singleton{    /**     * The Singleton's instance is stored in a static field.     */    private static $instance = null;    /**     * Change the constructor to private to ensure new objects using the `new` keyword can not be done.     */    protected function __construct() { }    /**     * Singletons should not be cloneable.     */    protected function __clone() { }    /**     * The getInstance method is used to access the object. On the first entry it will     * create the object afterwards it will get the instance of the old object        *      */    public static function getInstance(): Singleton    {        if (self::$instance === null) {            self::$instance = new static();        }        return self::$instance;    }    /**     * Business logic methods     */    public function methods()    {    }}/** * Consume the code */function someCode(){    $singleton1 = Singleton::getInstance();    $singleton2 = Singleton::getInstance();    if ($singleton1 === $singleton2) {        echo 'Singleton getInstance returned the same object';    } else {        echo 'Singleton getInstance didnt return the same object';    }}someCode();