Singleton

class Singleton
{
    private static $instance = null;
    private $id=1;
    public static function getInstance()
    {
        if (null === self::$instance)
        {
            self::$instance = new self();
        }
        return self::$instance;
    }
    private function __clone() {}
    private function __construct() {}
    public function myId()
    {
        return $this->id;
    }
}
$Object = Singleton::getInstance();  // Получение объекта
$Object -> myId();