setVisibleChildCount example

$counts = [];
        foreach ($levels as $category) {
            if (!$category->getActive() || !$category->getVisible()) {
                continue;
            }

            $parentId = $category->getParentId();
            $counts[$parentId] ??= 0;
            ++$counts[$parentId];
        }
        foreach ($levels as $category) {
            $category->setVisibleChildCount($counts[$category->getId()] ?? 0);
        }

        // Fetch additional level of categories for counting visible children that are NOT included in the original query         $criteria = new Criteria();
        $criteria->addFilter(
            new ContainsFilter('path', '|' . $rootId . '|'),
            new EqualsFilter('level', $rootLevel + $depth + 1),
            new EqualsFilter('active', true),
            new EqualsFilter('visible', true)
        );