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

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v0.7.1 2022-12-20 16:02 UTC


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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.


Since this is a Composer package, run composer require --dev typo3/coding-standards in your Composer project, which of course includes TYPO3 project or extension or any other 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

Ensures that your PHP files are subject 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, almost every editor supports the .editorconfig nowadays.

Setting up the TYPO3 rule sets as boilerplate

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

composer exec typo3-coding-standards setup

or via the shortcut, which of course works for every command:

composer exec t3-cs s

The type project or extension is automatically detected. If the detection does not work for you (please also tell us about your case at https://github.com/TYPO3/coding-standards/issues), you can specify the desired type as parameter like this:

composer exec typo3-coding-standards setup project


composer exec typo3-coding-standards setup extension

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

  • .php-cs-fixer.dist.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.

Updating the TYPO3 rule sets

To update the rule sets, run composer update typo3/coding-standards. An updated PHP-CS-Fixer rule set is applied immediately, but changes to the .editorconfig file must be applied manually by running composer exec typo3-coding-standards update.

This will overwrite your changes in the .editorconfig and reset it to the TYPO3 default values. Please make sure that your file has been properly committed to your repository before proceeding with the update.

You can also reset all files to the TYPO3 defaults by providing the --force option to the setup command:

composer exec -- typo3-coding-standards setup --force

Don't forget to provide the two dashes after exec if you use options.

Advanced usage examples

Show a command specific help e.g. with composer exec typo3-coding-standards help setup.

It is possible to specify a destination folder for the files or to set up only a part of the TYPO3 coding standards, here are some examples.

Setup .editorconfig only:

composer exec -- typo3-coding-standards setup --rule-set=editorconfig

Setup .php-cs-fixer.dist.php in the Build folder:

composer exec -- typo3-coding-standards setup --target-dir=Build --rule-set=php-cs-fixer

Symfony comes with a great shortcut support for all commands e.g. this is the same like the last command above:

composer exec -- t3-cs s -d=Build -r=php-cs-fixer

Update the .editorconfig:

composer exec t3-cs u

Running the script directly not using Composer:

vendor/bin/typo3-coding-standards setup

Of course this assumes the binaries are installed by Composer at the default location vendor/bin. That's why we recommend using composer exec in the first place becaue Composer is aware of the correct location.

Executing the PHP-CS-Fixer

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

composer exec php-cs-fixer

Have a look at our GitHub Actions Continuous Integration workflow to get an idea on how to automate your testing workflows using this package.

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.

Video Tutorial

TYPO3-Tutorial - The TYPO3 Coding Standards Package

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