User::__construct

public function __construct($id)
{
	global $USER;
	if (is_object($USER) && $id == $USER->getId())
	{
		$this->id = $USER->getId();
		$this->groups = $USER->GetUserGroupArray();
	}
	else if ($id > 0)
	{
		$this->id = $id;
		$this->groups = BitrixMainUserTable::getUserGroupIds($id);
	}
	$this->forumUser = ForumUser::getById($this->id);
}