Site::getVersion

static function getVersion($siteId): int
{
	static $versions;

	if (isset($versions[$siteId]))
	{
		return $versions[$siteId];
	}

	$resSite = self::getList([
		'select' => [
			'VERSION'
		],
		'filter' => [
			'=ID' => $siteId
		]
	]);
	if ($site = $resSite->fetch())
	{
		$versions[$siteId] = (int)$site['VERSION'];
	}
	else
	{
		$versions[$siteId] = 0;
	}

	return $versions[$siteId];
}