core-bundle/src/Resources/contao/classes/Frontend.php
protected function getLoginStatus($strCookie)
	{
		@trigger_error('Using Frontend::getLoginStatus() has been deprecated and will no longer work in Contao 5.0. Use Symfony security instead.', E_USER_DEPRECATED);

		$objTokenChecker = System::getContainer()->get('contao.security.token_checker');

		if ($strCookie == 'BE_USER_AUTH' && $objTokenChecker->hasBackendUser())
		{
			// Always return false if we are not in preview mode (show hidden elements)
			if (TL_MODE == 'FE' && !$objTokenChecker->isPreviewMode())
			{
				return false;
			}

			return true;
		}

		if ($strCookie == 'FE_USER_AUTH' && $objTokenChecker->hasFrontendUser())
		{
			return true;
		}

		return false;
	}
protected function getLoginStatus($strCookie)
	{
		@trigger_error('Using Frontend::getLoginStatus() has been deprecated and will no longer work in Contao 5.0. Use Symfony security instead.', E_USER_DEPRECATED);

		$objTokenChecker = System::getContainer()->get('contao.security.token_checker');

		if ($strCookie == 'BE_USER_AUTH' && $objTokenChecker->hasBackendUser())
		{
			// Always return false if we are not in preview mode (show hidden elements)
			if (TL_MODE == 'FE' && !$objTokenChecker->isPreviewMode())
			{
				return false;
			}

			return true;
		}

		if ($strCookie == 'FE_USER_AUTH' && $objTokenChecker->hasFrontendUser())
		{
			return true;
		}

		return false;
	}
Check whether a back end or front end user is logged in

@param string $strCookie

@return boolean

@deprecated Deprecated since Contao 4.5, to be removed in Contao 5.0.
Use Symfony security instead.