Pimcore\Model\Object\ClassDefinition\Data\Localizedfields::getCacheTags PHP Method

    public function getCacheTags($data, $tags = [])
    {
        $tags = is_array($tags) ? $tags : [];
        if (!$data instanceof Object\Localizedfield) {
            return $tags;
        }
        foreach ($data->getItems() as $language => $values) {
            foreach ($this->getFieldDefinitions() as $fd) {
                $tags = $fd->getCacheTags($values[$fd->getName()], $tags);
            }
        }
        return $tags;
    }