FrontendUser::logout() 

\nn\t3::FrontendUser()->logout(); 

Log out the current FE-USer manually

\nn\t3::FrontendUser()->logout();
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| @return void

Source Code 

public function logout()
{
	if (!$this->isLoggedIn()) return false;
	// In der MiddleWare ist der FE-User evtl. noch nicht initialisiert...
	if ($TSFE = \nn\t3::Tsfe()->get()) {
		if (($TSFE->fe_user ?? null) && method_exists($TSFE->fe_user, 'logoff')) {
			$TSFE->fe_user->logoff();
		}
	}
	// Session-Daten aus Tabelle `fe_sessions` löschen
	if ($sessionManager = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Session\SessionManager::class)) {
		$sessionBackend = $sessionManager->getSessionBackend('FE');
		if ($sessionId = $this->getSessionId()) {
			$sessionBackend->remove( $sessionId );
		}
	}
	// ... aber Cookie löschen geht immer!
	$this->removeCookie();
	// ToDo: Replace with Signal/Slot when deprecated
	if ($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['felogin']['logout_confirmed'] ?? false) {
		$_params = array();
		foreach ($GLOBALS['TYPO3_CONF_VARS']['EXTCONF']['felogin']['logout_confirmed'] as $_funcRef) {
			if ($_funcRef) GeneralUtility::callUserFunction($_funcRef, $_params, $this);
		}
	}
}
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