Final Class Yiisoft\Yii\Widgets\Helper\Normalizer

                public static function dropdown(array $items): array
{
    /**
     * @psalm-var array[] $items
     * @psalm-suppress RedundantConditionGivenDocblockType
     */
    foreach ($items as $i => $child) {
        if (is_array($child)) {
            $items[$i]['label'] = self::renderLabel(
                self::label($child),
                self::icon($child),
                self::iconAttributes($child),
                self::iconClass($child),
                self::iconContainerAttributes($child),
            );
            $items[$i]['active'] = self::active($child, '', '', false);
            $items[$i]['disabled'] = self::disabled($child);
            $items[$i]['enclose'] = self::enclose($child);
            $items[$i]['headerAttributes'] = self::headerAttributes($child);
            $items[$i]['itemContainerAttributes'] = self::itemContainerAttributes($child);
            $items[$i]['link'] = self::link($child, '/');
            $items[$i]['linkAttributes'] = self::linkAttributes($child);
            $items[$i]['toggleAttributes'] = self::toggleAttributes($child);
            $items[$i]['visible'] = self::visible($child);
            if (isset($child['items']) && is_array($child['items'])) {
                $items[$i]['items'] = self::dropdown($child['items']);
            } else {
                $items[$i]['items'] = [];
            }
        }
    }
    return $items;
}

            

                public static function menu(
    array $items,
    string $currentPath,
    bool $activateItems,
    array $iconContainerAttributes = []
): array {
    /**
     * @psalm-var array[] $items
     * @psalm-suppress RedundantConditionGivenDocblockType
     */
    foreach ($items as $i => $child) {
        if (is_array($child)) {
            if (isset($child['items']) && is_array($child['items'])) {
                $items[$i]['items'] = self::menu(
                    $child['items'],
                    $currentPath,
                    $activateItems,
                    $iconContainerAttributes,
                );
            } else {
                $items[$i]['link'] = self::link($child);
                $items[$i]['linkAttributes'] = self::linkAttributes($child);
                $items[$i]['active'] = self::active(
                    $child,
                    $items[$i]['link'],
                    $currentPath,
                    $activateItems
                );
                $items[$i]['disabled'] = self::disabled($child);
                $items[$i]['visible'] = self::visible($child);
                $items[$i]['label'] = self::renderLabel(
                    self::label($child),
                    self::icon($child),
                    self::iconAttributes($child),
                    self::iconClass($child),
                    self::iconContainerAttributes($child, $iconContainerAttributes),
                );
            }
        }
    }
    return $items;
}

            

                public static function renderLabel(
    string $label,
    string $icon,
    array $iconAttributes,
    string $iconClass,
    array $iconContainerAttributes
): string {
    $html = '';
    if ($iconClass !== '') {
        Html::addCssClass($iconAttributes, $iconClass);
    }
    if ($icon !== '' || $iconAttributes !== [] || $iconClass !== '') {
        $i = I::tag()->attributes($iconAttributes)->content($icon);
        $html = Span::tag()->attributes($iconContainerAttributes)->content($i)->encode(false)->render();
    }
    if ($label !== '') {
        $html .= $label;
    }
    return $html;
}