---
title: "Deprecation: #76804 - Deprecate GeneralUtility::strtoupper & strtolower"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:deprecation-76804"
source: "Changelog/8.3/Deprecation-76804-DeprecateGeneralUtilitystrtoupperStrtolower.rst"
typo3-version: "8.3"
typo3-major: 8
type: "deprecation"
issue: 76804
forge: "https://forge.typo3.org/issues/76804"
tags: ["PHP-API"]
rendered: "2026-09-17T21:17:42+00:00"
---

# Deprecation: #76804 - Deprecate GeneralUtility::strtoupper & strtolower {#deprecation-76804-deprecate-generalutility-strtoupper-strtolower}

See [forge#76804](https://forge.typo3.org/issues/76804)

## Description {#description}

The following methods within `GeneralUtility` have been marked as deprecated:

-   `strtoupper()`
-   `strtolower()`

## Impact {#impact}

Calling any of the methods above will trigger a deprecation log entry.

## Affected Installations {#affected-installations}

Any installation with a 3rd party extension calling one of the methods in its PHP code.

## Migration {#migration}

Instead of `GeneralUtility::strtoupper($value)` use:

```php
mb_strtoupper($value, 'utf-8');
```

Instead of `GeneralUtility::strtolower($value)` use:

```php
mb_strtolower($value, 'utf-8');
```

Alternatively use the native implementation of `strtoupper($value)` or `strtolower($value)`
if the handled string consists of ascii characters only.