Deprecation: #91012 - Various hooks related to TypoScriptFrontendController 

Description 

The following hooks related to class TypoScriptFrontendController and frontend-rendering have been marked as deprecated:

• $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['pageIndexing']
• $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['isOutputting']
• $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['tslib_fe-contentStrReplace']
• $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['contentPostProc-output']
• $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['hook_eofe']

The following methods have been marked as deprecated as well, as they only contain code relevant for executing the hooks:

• TypoScriptFrontendController->isOutputting()
• TypoScriptFrontendController->processContentForOutput()

Impact 

If third-party extensions are using the hooks, a PHP E_USER_DEPRECATED error will be triggered when the hook is executed.

Calling the two methods above will also trigger a PHP E_USER_DEPRECATED error.

Affected Installations 

TYPO3 installations with custom extensions using the hooks or mentioned above, which is common if they haven't been using PSR-15 middlewares or other hooks instead.

Migration 

The hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['pageIndexing'] should be replaced by the $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['contentPostProc-cached'] hook to index pages. However, please note that $TSFE->content might contain UTF-8 content now, instead of content already converted to the defined character set related to metaCharset TypoScript property.

Since TYPO3 v9, the emitter of HTTP responses is based on PSR-7, the hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['isOutputting'] can be removed, as TYPO3 can be configured via PSR-15 middlewares to define whether page content should be emitted / rendered or not.

The hook to dynamically replace content via $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['tslib_fe-contentStrReplace'] is removed as it serves no purpose for TYPO3 Core anymore. If content should be dynamically modified, use a PSR-15 middleware instead.

The hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['contentPostProc-output'] is not needed as this can be built via a PSR-15 middleware instead, and all content is returned via the RequestHandler of TYPO3 Frontend.

Extensions using hook $GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['tslib/class.tslib_fe.php']['hook_eofe'] should be converted to PSR-15 middlewares, as this allows to modify content and headers of a PSR-7 Response object.

The method TypoScriptFrontendController->isOutputting() is obsolete and can be removed in third-party code.

The same applies to TypoScriptFrontendController->processContentForOutput() which should only be used to trigger legacy hooks still applied in the system.