- Use a base controller all your controllers inherit from
        class IndexController extends ControllerBase {
          public function initialize() {
              Tag::setTitle('Welcome');
              parent::initialize();
          }
          public function indexAction() {
          }
}
- define the initialize method in the base controller and define the vars
class ControllerBase extends \Phalcon\Mvc\Controller {
            public function initialize(){
                $this->view->setVar("globalBlaa","Helllooo");
            }
}
- show it in any view
        {{globalBlaa }}