Elementor\Plugin::instance PHP Method

    public static function instance()
    {
        if (is_null(self::$_instance)) {
            self::$_instance = new self();
            do_action('elementor/loaded');
        }
        return self::$_instance;
    }

 /**
  * @param array $data a set of elements
  * @param string $method (on_export|on_import)
  *
  * @return mixed
  */
 protected function process_export_import_data($data, $method)
 {
     return Plugin::instance()->db->iterate_data($data, function ($element) use($method) {
         if ('widget' === $element['elType']) {
             $element_class = Plugin::instance()->widgets_manager->get_widget_types($element['widgetType']);
         } else {
             $element_class = Plugin::instance()->elements_manager->get_element_types($element['elType']);
         }
         // If the widget/element isn't exist, like a plugin that creates a widget but deactivated
         if (!$element_class) {
             return $element;
         }
         if (method_exists($element_class, $method)) {
             $element = $element_class->{$method}($element);
         }
         foreach ($element_class->get_controls() as $control) {
             $control_class = Plugin::instance()->controls_manager->get_control($control['type']);
             // If the control isn't exist, like a plugin that creates the control but deactivated
             if (!$control_class) {
                 return $element;
             }
             if (method_exists($control_class, $method)) {
                 $element['settings'][$control['name']] = $control_class->{$method}($element['settings'][$control['name']]);
             }
         }
         return $element;
     });
 }