class ZkWidgtetAreaExtension extends DataExtension {

    private $widgetAreas;

    /**
     * Recupero l'array delle WidgetArea definito nel config
     * @param Array $widgetAreas
     */
    public function __construct($widgetAreas) {
        echo "<pre>[A]"; print_r($widgetAreas);
        exit;
        if (is_array($widgetAreas)) {
            $this->widgetAreas = $widgetAreas;
        }

        parent::__construct();
    }

[...]