如何在TYPO3后端写入登录？

Question

I would like to debug backend and need to write some logs. I tried the code belowed but it is not working, it doesn't write anything ! Can you help me ?

var $logger;

    public function __construct()
    {
        parent::__construct();
        // desactiver le cache sinoin les FE plugins ne sont pas réactualisé
        // desactivation dans le backend modifie des liens en ajoutant '/no_cache/' devant le lien
        // les liens deviennent inutilisables
        $GLOBALS['TSFE']->set_no_cache();
        $this->logger = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\CMS\Core\Log\LogManager')->getLogger(__CLASS__);
        $this->logger->info('Everything went fine.');
    }

Answer 1

Try following PHP, adapt your extension-key and choose error-level

// Log message
$logMessage = 'Everything went fine.';
// Option extension key / module name
$extKey = 'my_extension';
// Error-level: 0 = message, 1 = error (user problem), 2 = System Error (which should not happen), 3 = security notice (admin)
$errorLevel = 0;
// Write sys_log using \TYPO3\CMS\Core\Utility\GeneralUtility::sysLog
$GLOBALS['BE_USER']->simplelog($logMessage, $extKey, $errorLevel);

Then you will find your message with timestamp and further informations in sys_log table or in BE modul with name 'Log'.