First of all, thank you for contributing!
Here are a few rules to follow in order to ease code reviews and merging:
- follow PSR-1, PSR-2 and PER-02
- run the test suite
- write (or update) unit tests when applicable
- write documentation for new features
- use commit messages that make sense
One may ask you to squash your commits too. This is used to "clean" your pull request before merging it (we don't want commits such as fix tests, fix 2, fix 3, etc.).
When creating your pull request on GitHub, please write a description which gives the context and/or explains why you are creating it.