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Contao is a powerful open source CMS that allows you to create professional websites and scalable web applications. Visit the project website for more information.


The purpose of this package is to develop the Contao bundles. Use it if you e.g. want to create a pull request or if you want to report an issue.

The monorepo is split into separate packages automatically:

Please do not use contao/contao in production! Use the split packages instead.


To create a pull request and to test your changes within a running Contao application, it is the easiest to use the Contao Managed Edition. Start by installing it in your current directory:

composer create-project --no-install contao/managed-edition <directory> <branch>

Replace <directory> with the directory you want to install the Managed Edition in (use . for the current one). Replace <branch> with dev-master if you want to add a new feature or with <lts-version>.x-dev (currently 4.9.x-dev) if you want to fix a bug.

Then adjust the require section in your composer.json file so Composer loads the monorepo instead of the individual bundles:

"require": {
    "php": "^7.2",
    "contao/contao": "dev-master"

Again, use dev-master if you want to add a new feature or <lts-version>.x-dev if you want to fix a bug.

Next, install the dependencies:

composer update

Composer will automatically clone the Git repo into the vendor/contao/contao folder. You can finish your setup by opening https://your-domain.local/contao/install in your browser.

All the changes you make in vendor/contao/contao are be tracked via Git, so you can submit your pull request directly from within your application.

Running scripts

First install the code quality tools:

composer bin all update

Then run the code quality scripts via Composer:

composer run all
composer run unit-tests
composer run cs-fixer
composer run phpstan
composer run psalm

If you want to pass additional flags to the underlying commands, you can use the -- argument:

composer run unit-tests -- --filter CoreBundle
composer run cs-fixer -- --clear-cache

Functional tests

To set up functional tests, create a database named contao_test:

mysql -e "CREATE DATABASE contao_test"

If your database uses credentials, copy the file core-bundle/phpunit.xml.dist to core-bundle/phpunit.xml and adjust the following line:

    <env name="DATABASE_URL" value="mysql://root@localhost:3306/contao_test" />

Then run the functional tests via the run command:

composer run functional-tests


Contao is licensed under the terms of the LGPLv3.

Getting support

Visit the support page to learn about the available support options.