BlogUser::getPostAuthorsIdsByDbFilter

static function getPostAuthorsIdsByDbFilter($arFilter)
{
	if (!$arFilter)
		throw new ArgumentNullException('blog ID');
	if(!is_array($arFilter))
		return array();
	
	$result = array();
	$resPost = CBlogPost::GetList(array(), $arFilter, false, false, array("AUTHOR_ID"));
	while ($post = $resPost->Fetch())
		if ($post["AUTHOR_ID"])
			$result[$post["AUTHOR_ID"]] = $post["AUTHOR_ID"];
	
	return $result;
}