---
title: "Deprecation: #84981 - BackendUserAuthentication->simplelog()"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:deprecation-84981"
source: "Changelog/9.3/Deprecation-84981-BackendUserAuthentication-simplelogDeprecated.rst"
typo3-version: "9.3"
typo3-major: 9
type: "deprecation"
issue: 84981
forge: "https://forge.typo3.org/issues/84981"
tags: ["Backend", "PHP-API", "FullyScanned"]
rendered: "2026-09-20T18:31:11+00:00"
---

# Deprecation: #84981 - BackendUserAuthentication->simplelog() {#deprecation-84981}

See [forge#84981](https://forge.typo3.org/issues/84981)

## Description {#description}

Method `TYPO3\CMS\Core\Authentication\BackendUserAuthentication->simplelog()` has been marked as deprecated.

## Impact {#impact}

The method has been a shortcut to `writelog()` which can be used instead.

## Affected Installations {#affected-installations}

Instances with extensions that call this method. Calling the method will trigger a PHP `E_USER_DEPRECATED` error.
The extension scanner should find possible usages.

## Migration {#migration}

Use `writelog()` instead or - even better - use the logging framework to log messages.