---
title: "Deprecation: #65344 - typo3conf/extTables.php deprecated"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:deprecation-65344"
source: "Changelog/7.3/Deprecation-65344-ExtTables.rst"
modified: "2026-09-15T10:46:36+00:00"
---

# Deprecation: #65344 - typo3conf/extTables.php deprecated

See [forge#65344](https://forge.typo3.org/issues/65344)

## Description

The file `typo3conf/extTables.php` which could be used for local TCA modifications has been marked as deprecated.

Setting `$GLOBALS['TYPO3_CONF_VARS']['DB']['extTablesDefinitionScript']` together with the constant
`TYPO3_extTableDef_script` are deprecated and should not be used any longer.

## Impact

The options and files are typically used for "poor man" `$GLOBALS['TCA']` overrides. This is discouraged
and shouldn't be used any longer.

## Migration

There are two options to migrate away from `typo3conf/extTables.php` usage, the first one should be preferred:

-   It is good practice to have a project / site specific extension that contains templates, TypoScript and
    other stuff. Create one or more dedicated extensions and use TCA overrides to apply the desired modifications.
    Something like `$GLOBALS['TCA']['pages']['ctrl']['hideAtCopy'] = FALSE;` should be moved from
    `typo3conf/extTables.php` to `typo3conf/ext/<your_extension>/Configuration/TCA/Overrides/pages.php`.
-   Slot the signal `tcaIsBeingBuilt` that is emitted in `ExtensionManagementUtility.php`.