CBXVirtualIoFileSystem::SiteRelativeToAbsolutePath

public function SiteRelativeToAbsolutePath($relativePath, $site = null)
{
	if ((string)$site === "")
	{
		$site = SITE_ID;
	}
	else
	{
		$dbSite = CSite::GetByID($site);
		$site = "";
		if ($arSite = $dbSite->Fetch())
			$site = $_REQUEST["site"];
		if ((string)$site === "")
			$site = SITE_ID;
	}

	$basePath = CSite::GetSiteDocRoot($site);

	return $this->CombinePath($basePath, $relativePath);
}