Helper::getIdsByFilter

static function getIdsByFilter($listFilter)
{
	$ids = array();
	$entityClass = static::getEntityClass();

	$res = $entityClass::getList(array(
		'select' => array('ID'),
		'filter' => is_array($listFilter) ? $listFilter : array()
	));
	while($item = $res->fetch())
	{
		$ids[] = intval($item['ID']);
	}

	return $ids;
}