eZ\Publish\Core\Repository\Helper\NameSchemaService::mergeFieldMap PHP Method

    protected function mergeFieldMap(Content $content, array $fieldMap, array $languageCodes)
    {
        if (empty($fieldMap)) {
            return $content->fields;
        }
        $mergedFieldMap = array();
        foreach ($content->fields as $fieldIdentifier => $fieldLanguageMap) {
            foreach ($languageCodes as $languageCode) {
                $mergedFieldMap[$fieldIdentifier][$languageCode] = isset($fieldMap[$fieldIdentifier][$languageCode]) ? $fieldMap[$fieldIdentifier][$languageCode] : $fieldLanguageMap[$languageCode];
            }
        }
        return $mergedFieldMap;
    }