Coder is a library to review Drupal code.

standards, phpcs, code review



Build Status

Coder is a library for automated Drupal code reviews and coding standard fixes. It defines rules for PHP_CodeSniffer

Built-in support for:

Online documentation:

Note that Javascript support has been removed. To check and fix Javascript files please use ESLint and see the Drupal ESLint documentation.


First, make sure Composer is installed correctly:

which composer

If you get composer not found or similar, follow Composer's installation instructions.

Install Coder (8.x-2.x) in your global Composer directory in your home directory (~/.composer):

composer global require drupal/coder

To make the phpcs and phpcbf commands available globally, add the Composer bin path to your $PATH variable in ~/.profile, ~/.bashrc or ~/.zshrc:

export PATH="$PATH:$HOME/.composer/vendor/bin"

Register the Drupal and DrupalPractice Standard with PHPCS:

phpcs --config-set installed_paths ~/.composer/vendor/drupal/coder/coder_sniffer

Composer Installer Plugins

The Coder package (>= 8.2.11) now works with Composer Installer Plugins, that find and register standards whenever packages are installed or updated. To use such a plugin within your project, follow these steps.

composer require --dev dealerdirect/phpcodesniffer-composer-installer
composer require --dev drupal/coder

Now, you will see Drupal and DrupalPractice listed in the available PHP CodeSniffer standards.

vendor/bin/phpcs -i

The same can be done for a Composer global installation.

composer global require dealerdirect/phpcodesniffer-composer-installer
composer global require drupal/coder


Check Drupal coding standards

phpcs --standard=Drupal /file/to/drupal/example_module

Check Drupal best practices

phpcs --standard=DrupalPractice /file/to/drupal/example_module

Automatically fix coding standards

phpcbf --standard=Drupal /file/to/drupal/example_module

Working with Editors

Drupal Code Sniffer can be used with various editors.


Automated Testing (PHPUnit + PHPCS)

Coder Sniffer comes with a PHPUnit test suite to make sure the sniffs work correctly. Use Composer to install the dependencies:

composer install

Then execute the tests:


Then execute the coding standards checker on Coder itself:



  1. Make sure an issue exists at
  2. Create a pull request against
  3. Post a link to the pull request to the issue on and set the issue to "needs review"

Thank you!


Pieter Frenssen,


Greg Sherwood and Squiz Pty Ltd, many sniffs are modified copies of their original work on PHPCS.