TYPO3 v15 dev-main snapshot ()

2026-08-10 22:31:09 +02:00
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+.. include:: /Includes.rst.txt
+
+.. _deprecation-64361:
+
+============================================
+Deprecation: #64361 - Composer Class Loading
+============================================
+
+See :issue:`64361`
+
+Description
+===========
+
+TYPO3 CMS started integrating composer support and by that embracing PHP standards PSR-0 and PSR-4 for class
+loading that comes with composer.
+The old class loader is still present and registered and will handle loading extension classes
+that do not follow the above mentioned standards.
+
+For the time being a pre-compiled composer class loader is shipped with the git repository,
+so that people using the TYPO3 sources directly from there can use it without requiring a `composer install`
+step.
+
+It is possible however to do a `composer install` in the TYPO3 sources directory or a top level distribution directory
+to gain full control over class loading of your TYPO3 installation. This step is optional and currently requires
+thorough knowledge of composer and as such currently is only recommended for people familiar with this process.
+
+Further technical details can be found in the `documentation`_.
+
+Impact
+======
+
+Third party libraries added to a TYPO3 installation via composer can immediately be used without
+further manual intervention. The classes cache for most core classes will be gone. Resolving classes
+is slowly shifted from a run time task - executed and monitored in every request - to an installation task
+with composer.
+
+Affected installations
+======================
+
+Some installations could be affected which were previously installed via composer,
+but now not properly updated using composer. And outdated Packages/Libraries/autoload.php file
+present in the system will lead to fatal errors.
+
+
+Migration
+=========
+
+If you previously installed TYPO3 via composer, make sure you perform a `composer update` command to reflect
+the current changes in your Packages folder.
+
+
+.. _`documentation`: https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/ApiOverview/Autoloading/Background.html
+
+
+.. index:: PHP-API