UserHelper::getCurrentUserId

static function getCurrentUserId()
{
	if (static::$currentUserId)
	{
		return static::$currentUserId;
	}
	global $USER;
	$userId = 0;
	if ($USER && is_object($USER) && $USER->isAuthorized() && $USER->getId() > 0)
	{
		$userId = $USER->getId();
	}
	return $userId;
}