ezsystems / ezpublish-kernel

    {

        $languageCodes = array();

        foreach ($contentCreateStruct->fields as $field) {

            if ($field->languageCode === null || isset($languageCodes[$field->languageCode])) {

                continue;

            }

            $this->persistenceHandler->contentLanguageHandler()->loadByLanguageCode(

                $field->languageCode

            );

            $languageCodes[$field->languageCode] = true;

        }

        if (!isset($languageCodes[$contentCreateStruct->mainLanguageCode])) {

            $this->persistenceHandler->contentLanguageHandler()->loadByLanguageCode(

        $languageCodes = array_fill_keys($content->versionInfo->languageCodes, true);

        $languageCodes[$contentUpdateStruct->initialLanguageCode] = true;

        foreach ($contentUpdateStruct->fields as $field) {

            if ($field->languageCode === null || isset($languageCodes[$field->languageCode])) {

                continue;

            }

            $this->persistenceHandler->contentLanguageHandler()->loadByLanguageCode(

                $field->languageCode

            );

            $languageCodes[$field->languageCode] = true;

        }

        return array_keys($languageCodes);

    }