Neos\Flow\Mvc\View\JsonView::transformValue PHP Method

    protected function transformValue($value, array $configuration)
    {
        if (is_array($value) || $value instanceof \ArrayAccess) {
            $array = [];
            foreach ($value as $key => $element) {
                if (isset($configuration['_descendAll']) && is_array($configuration['_descendAll'])) {
                    $array[$key] = $this->transformValue($element, $configuration['_descendAll']);
                } else {
                    if (isset($configuration['_only']) && is_array($configuration['_only']) && !in_array($key, $configuration['_only'])) {
                        continue;
                    }
                    if (isset($configuration['_exclude']) && is_array($configuration['_exclude']) && in_array($key, $configuration['_exclude'])) {
                        continue;
                    }
                    $array[$key] = $this->transformValue($element, isset($configuration[$key]) ? $configuration[$key] : []);
                }
            }
            return $array;
        } elseif (is_object($value) && $value instanceof \JsonSerializable) {
            return $this->transformValue($value->jsonSerialize(), $configuration);
        } elseif (is_object($value)) {
            return $this->transformObject($value, $configuration);
        } else {
            return $value;
        }
    }