CDavPrincipal::__construct

public function __construct($user)
{
	if (is_array($user))
		$this->InitializeFromArray($user);
	elseif (is_int($user))
		$this->InitializeFromId($user);
	elseif (is_bool($user) && $user || is_string($user) && mb_strtolower($user) == "current")
		$this->InitializeFromCurrent();
}