Deprecation: #82254 - Deprecate $GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf']

See Issue #82254

Description

The extension configuration stored in $GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'] has been deprecated and replaced by a plain array in $GLOBALS['TYPO3_CONF_VARS']['EXTENSIONS']. A new API has been introduced to retrieve extension configuration.

Affected Installations

All extensions manually getting settings and unserializing them from $GLOBALS['TYPO3_CONF_VARS']['EXT']['extConf'].

Migration

Use a new API to retrieve extension configuration, examples:

// Retrieve a single key
$backendFavicon = (bool)GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('backend', 'backendFavicon');

// Retrieve whole configuration
$backendConfiguration = GeneralUtility::makeInstance(ExtensionConfiguration::class)->get('backend');

// Fully qualified class names for usage in ext_localconf.php / ext_tables.php
$backendConfiguration = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance(
    \TYPO3\CMS\Core\Configuration\ExtensionConfiguration::class
)->get('backend');