CWebDavFile::CheckUniqueName

function CheckUniqueName($basename, $section_id, &$res)
{
	$section_id = trim($section_id);
	$basename = trim($basename);
	if (empty($basename))
		return false;
	$this->IsDir(array("path" => $section_id . "/" . $basename));
	return $this->arParams["not_found"];
}