A set of coding guidelines for any TYPO3-related project or extension

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v0.5.0 2021-11-16 11:09 UTC

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Last update: 2022-01-20 10:56:19 UTC


Continuous Integration (CI) Core Synchronization

You know the feeling: You work on your own extension, and then contribute to TYPO3, and TYPO3 delivers all the nice things to check for proper coding standards.

Well, same happens to all of us! Luckily, TYPO3 has this configuration in Core, and it's now available separately - ready to plug-and-play for you!

It does not matter if you're an extension developer, or a TYPO3 contributor, or working on your TYPO3 project.


As this is a composer package, execute composer req --dev typo3/coding-standards in your composer project.

What's in the package?

The coding guidelines that are used in TYPO3 Core development. Instead of putting this information in our main repository, it should be helpful to apply certain rules to other projects as well. TYPO3 is more than just TYPO3 Core!

PHP-CS-Fixer rules

Making sure your PHP files apply to the same rules.


If you work on a team, and you use different IDE settings, .editorconfig helps you to have the same settings across all editors. It does not matter if it is VS-Code, vim or PhpStorm.

Setting up the TYPO3 rulesets as boilerplate

Our coding standards file can set this up for you. Run

composer exec typo3-coding-standards project


composer exec typo3-coding-standards extension

or if you want to update the rules, add -f option to the end.

Have a look at the newly created files in your root folder:

  • .php-cs-fixer.php
  • .editorconfig

For projects, the folder src is configured by default, but you can accommodate where your extensions or PHP code resides in. For extensions, PHP-CS-Fixer scans the whole base directory.

In addition, you can configure your PHP-CS-Fixer cache file folder and other configurations just like with PHP-CS-Fixer.

You can decide to commit them to your Git repository, which is the recommended way.

Executing the PHP-CS-Fixer

Once you've followed the step above, running PHP CS Fixer works like this:

composer exec php-cs-fixer

Leave a note on how you set it up on GitHub Actions or GitLab CI/CD so this document can be even more helpful for everybody.

What's next?

We'd love to ship out license headers for all PHP files, however there are certain limitations (namespace must be underneath the license headers), which why this option is not enabled by default.

A note about our standards

PHP Coding Guidelines

TYPO3's coding guidelines have evolved over time. And we are happy to have PHP-FIG and PSR-1/PSR-2 and PSR-12. That's why we're committed to following these guidelines.

However, there are some more rules that we think are good:

  • Remove leading slashes in use clauses.
  • PHP single-line arrays should not have trailing comma.
  • Single-line whitespace before closing semicolon are prohibited.
  • Remove unused use statements in the PHP source code
  • Ensure Concatenation to have at least one whitespace around
  • Remove trailing whitespace at the end of blank lines.

Maintaining and Development of this package

This package is not meant to be updated regularly, since talking about coding guidelines takes a lot of time, and is usual a matter of taste. Nonetheless, you can always open up an issue if you feel like we're missing out on something.

A GitHub action automatically synchronizes the files with the TYPO3 Core. Please do not open pull requests for these changes, but push your changes to the TYPO3 Core.


The source code comes with a DDEV Local configuration that makes using Composer and switching PHP versions very easy. For more information about DDEV, see the documentation.

In the composer.json many scripts are predefined to run the CI locally before you push erroneous changes. Additionally some fix commands are integrated.

Manually update the files from the core

The synchronization job is scheduled once per night. It can also be started manually on the Actions tab on GitHub by selecting Core Synchronization and running the workflow on the main branch.

License & Thanks

This package is available under the MIT license, since it relies heavily on the PHP-CS-Fixer code.

In addition, I would like to thank the TYPO3 Core Team that kickstarted this set of rules in 2015, and to the creators and maintainers of PHP-CS-Fixer package.

Benni Mack, TYPO3 Project Lead