IblockElementField::getFormattedValueForExport

protected function getFormattedValueForExport($fieldValue, int $itemId, Options $displayOptions)
{
	$results = [];
	$linkedEntitiesValues = $this->getLinkedEntitiesValues();

	if (!$this->isMultiple())
	{
		return $linkedEntitiesValues[$fieldValue]['NAME'];
	}

	$fieldValue = is_array($fieldValue) ? $fieldValue : [$fieldValue];
	foreach ($fieldValue as $elementId)
	{
		$results[] = $linkedEntitiesValues[$elementId]['NAME'];
	}

	return implode($displayOptions->getMultipleFieldsDelimiter(), $results);
}