Rhubarb is an open source project licensed using the Apache 2.0 License.

Everyone is welcome to get involved and make contributions to the project. Contributions generally fall into three main areas:

1. The 'core' Rhubarb modules: e.g. rhubarb, module-stem, module-leaf, scaffold-authentication

All of the repositories in the rhubarbphp Github organisation embody the heart and spirit of the system. Their integrity is guaranteed by a list of appointed maintainers. However we welcome and love contributions from anyone and contributions should be made using a pull request from a forked version of the module in question into the 'develop' branch of the original repository.

2. Scaffolds

The ability to create scaffolds that deploy working components, and sometimes entire sections, of functionality through one package with zero configuration is one of the most fun aspects of working in Rhubarb. Everyone is free to share their own scaffolds with the community by publishing their module in

3. Documentation

Documenting a framework like Rhubarb is no easy task. If you find our documentation to be confusing, out of date, contradictory or just plain boring please consider helping us make it right. Our documentation is stored as markdown files in the "docs/" folder of each repository.

How to make modifications to existing modules

Before you start please be aware you cannot push to the official repositories. You must make a fork of the relevant module into your personal github account and make a pull request from there.

If you are a programming ninja and can trust your unit tests to guide you to completion then you simply need to clone your forked repos, make your changes, commit and do a PR to the develop branch in the original repos.

However in most cases you will want to see the effect of your changes in an active project. To do this you need first to inform composer that it should prefer your version of the module over the official version and secondly set the version number to the dev- branch you're working on.

    "repositories": [
            "type": "vcs",
            "url": ""
        "rhubarbphp/rhubarb": "1.*",
        "rhubarbphp/module-stem": "dev-develop"

Now do a composer update and you're ready to make your changes.

Once your changes are complete you need to commit your changes and then push to origin

git commit -am "Refactored the pipeline filtering mechanism"
git push origin

You must specifically mention origin in your push command as the default remote (called composer funny enough) is read only.


Rhubarb and its modules subscribe to the Apache License 2.0. All contributed files should contain the standard header as found in any existing Rhubarb code file.

Style Guide

Rhubarb and its modules use the PSR-1 and PSR-2 coding styles standardised by All contributions should conform to this standard.


  • All official Rhubarb projects should start their namespace with Rhubarb.
  • All unofficial Rhubarb projects should start their namespace with their appropriate vendor
  • All modules should follow the first section of namespace with the module namespace name.



  • All scaffold projects should follow the first section of namespace with "Scaffolds\" and then the module namespace name.




Rhubarb follows the PSR-4 namespacing and foldering conventions for class files. Code files should go into a folder called 'src' with further folder dictating the namespace of the class. Namespace roots should be registered in the project's composer.json file.

Unit tests should go into a 'tests' folder at the same level as the 'src' folder. The sub foldering should mirror that of the class under test. The namespace root of the 'tests' folder should be the same as the 'src' folder but with '\Tests' appended to the root.


Class: src/Models/Model.php
Namespace: Rhubarb\Stem\Models

Test: tests/Models/ModelTest.php
Namespace: Rhubarb\Stem\Tests\Models