Deprecation: #99615 - GeneralUtility::_GPmerged()

See forge#99615


The method \TYPO3\CMS\Core\Utility\GeneralUtility::_GPmerged() has been marked as deprecated and should not be used any longer.

Modern code should access GET and POST data from the PSR-7 \Psr\Http\Message\ServerRequestInterface, and should avoid accessing super-globals $_GET and $_POST directly. This helps creating controller classes with a clean architecture. Some \TYPO3\CMS\Core\Utility\GeneralUtility related helper methods like _GPmerged() violate this, using them is considered a technical debt. They are being phased out.


Calling the method will raise a deprecation level log error and will stop working with TYPO3 v13.

Affected installations

Instances with extensions using GeneralUtility::_GPmerged() are affected. The extension scanner will find usages with a strong match.


GeneralUtility::_GPmerged() is a helper method that retrieves request parameters and returns the value, while POST parameters take precedence over GET parameters, if both exist.

The same result can be achieved by retrieving arguments from the request object. An instance of the PSR-7 ServerRequestInterface is handed over to controllers by TYPO3 Core's PSR-15 \TYPO3\CMS\Core\Http\RequestHandlerInterface and middleware implementations, and is available in various related scopes like the frontend \TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer.

Typical code:

use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Utility\ArrayUtility;

// Before
$getMergedWithPost = GeneralUtility::_GPmerged('tx_scheduler');

// After
$getMergedWithPost = $request->getQueryParams()['tx_scheduler'];
ArrayUtility::mergeRecursiveWithOverrule($getMergedWithPost, $request->getParsedBody()['tx_scheduler']);