to::getSkuPropValues

static function getSkuPropValues($propId, $currentValue, array &$offersIds)
{
	if(!Loader::includeModule('iblock'))
		return array();

	$result = array();
	$foundElements = array();

	$res = CIBlockElement::GetList(
		array("SORT"=>"ASC"),
		array(
			'ID' => $offersIds,
			'!=PROPERTY_'.$propId => false
		),
		false,
		false,
		array('ID', 'PROPERTY_'.$propId)
	);

	while($el = $res->Fetch())
	{
		if(isset($el['PROPERTY_'.$propId.'_ENUM_ID']))
			$value = $el['PROPERTY_'.$propId.'_ENUM_ID'];
		else
			$value = $el['PROPERTY_'.$propId.'_VALUE'];

		if(!in_array($value, $result))
			$result[] = $value;

		$foundElements[] = $el['ID'];

		if($value != $currentValue)
		{
			$key = array_search($el['ID'], $offersIds);

			if($key !== false)
				unset($offersIds[$key]);
		}
	}

	$foundElements = array_unique($foundElements, SORT_NUMERIC);
	$valueLess = array_diff($offersIds, $foundElements);

	if(!empty($valueLess))
	{
		if(!empty($result))
			$result[] = '-';

		if($currentValue != '-')
			$offersIds = array_diff($offersIds, $valueLess);
	}

	return $result;
}