Piwik\Plugins\CoreConsole\Commands\GenerateWidget::getExistingCategories PHP Method

    protected function getExistingCategories()
    {
        $categories = array();
        foreach (WidgetsList::get()->getWidgetConfigs() as $widget) {
            if ($widget->getCategoryId()) {
                $categories[] = Piwik::translate($widget->getCategoryId());
            }
        }
        $categories = array_values(array_unique($categories));
        return $categories;
    }