ThemePicker::getTheme

public function getTheme($themeId, $userId = false)
{
	if (!is_string($themeId))
	{
		return null;
	}

	if ($this->isCustomThemeId($themeId))
	{
		return $this->getCustomTheme($themeId, $userId);
	}
	else
	{
		return $this->getStandardTheme($themeId);
	}
}