Manager::getExternalSiteController

static function getExternalSiteController()
{
	static $class = '';

	if (!$class)
	{
		if (class_exists('LandingSiteController'))
		{
			$class = 'LandingSiteController';
		}
		else if (
			Loader::includeModule('bitrix24') &&
			class_exists('BitrixBitrix24SiteController')
		)
		{
			$class = 'BitrixBitrix24SiteController';
		}
		else if (class_exists('BitrixLandingExternalSite24'))
		{
			$class = 'BitrixLandingExternalSite24';
		}
	}

	return $class;
}