eZ\Publish\Core\Repository\ContentTypeService::validateInputContentTypeGroups PHP Method

    protected function validateInputContentTypeGroups(array $contentTypeGroups)
    {
        if (empty($contentTypeGroups)) {
            throw new InvalidArgumentException('$contentTypeGroups', 'Argument must contain at least one ContentTypeGroup');
        }
        foreach ($contentTypeGroups as $key => $contentTypeGroup) {
            if (!$contentTypeGroup instanceof APIContentTypeGroup) {
                throw new InvalidArgumentType("\$contentTypeGroups[{$key}]", 'eZ\\Publish\\API\\Repository\\Values\\ContentType\\ContentTypeGroup', $contentTypeGroup);
            }
        }
    }