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# Contributing to the PHP Library for MongoDB

## Initializing the Repository

Developers who would like to contribute to the library will need to clone it and
initialize the project dependencies with [Composer](https://getcomposer.org/):

```
$ git clone https://github.com/mongodb/mongo-php-library.git
$ cd mongo-php-library
$ composer update
```

In addition to installing project dependencies, Composer will check that the
required extension version is installed. Directions for installing the extension
may be found [here](http://php.net/manual/en/mongodb.installation.php).

Installation directions for Composer may be found in its
[Getting Started](https://getcomposer.org/doc/00-intro.md) guide.

## Testing

The library's test suite uses [PHPUnit](https://phpunit.de/), which is installed
through the [PHPUnit Bridge](https://symfony.com/phpunit-bridge) dependency by
Composer.

The test suite may be executed with:

```
$ vendor/bin/simple-phpunit
```

The `phpunit.xml.dist` file is used as the default configuration file for the
test suite. In addition to various PHPUnit options, it defines required
`MONGODB_URI` and `MONGODB_DATABASE` environment variables. You may customize
this configuration by creating your own `phpunit.xml` file based on the
`phpunit.xml.dist` file we provide. To run the tests in serverless mode, set the
`MONGODB_IS_SERVERLESS` environment variable to `on`.

To run tests against a cluster that requires authentication, either include the
credentials in the connection string given in the `MONGODB_URI` environment
variable, or set the `MONGODB_USERNAME` and `MONGODB_PASSWORD` environment
variables accordingly. Note that values defined through the environment override
credentials present in the URI.

By default, the `simple-phpunit` binary chooses the correct PHPUnit version for
the PHP version you are running. To run tests against a specific PHPUnit version,
use the `SYMFONY_PHPUNIT_VERSION` environment variable:

```
$ SYMFONY_PHPUNIT_VERSION=7.5 vendor/bin/simple-phpunit
```

## Checking coding standards

The library's code is checked using [PHP_CodeSniffer](https://github.com/squizlabs/PHP_CodeSniffer),
which is installed as a development dependency by Composer. To check the code
for style errors, run the `phpcs` binary:

```
$ vendor/bin/phpcs
```

To automatically fix all fixable errors, use the `phpcbf` binary:

```
$ vendor/bin/phpcbf
```

## Documentation

Documentation for the library lives in the `docs/` directory and is built with
tools in the related
[mongodb/docs-php-library](https://github.com/mongodb/docs-php-library)
repository. The tools repository is already configured to reference our sources.

That said, any changes to the documentation should be tested locally before
committing. Follow the following steps to build the docs locally with the tools
repository:

* Clone the
[mongodb/docs-php-library](https://github.com/mongodb/docs-php-library) tools
repository.
* Install [giza](https://pypi.python.org/pypi/giza/), as noted in the tools
README.
* Sync your working copy of the documentation to the `source/` directory with
`rsync -a --delete /path/to/mongo-php-library/docs/ source/`.
* Build the documentation with `giza make publish`. You can suppress
informational log messages with the `--level warning` option.
* Generated documentation may be found in the `build/master/html` directory.

## Creating a maintenance branch and updating master branch alias

After releasing a new major or minor version (e.g. 1.9.0), a maintenance branch
(e.g. v1.9) should be created. Any development towards a patch release (e.g.
1.9.1) would then be done within that branch and any development for the next
major or minor release can continue in master.

After creating a maintenance branch, the `extra.branch-alias.dev-master` field
in the master branch's `composer.json` file should be updated. For example,
after branching v1.9, `composer.json` in the master branch may still read:

```
"branch-alias": {
"dev-master": "1.9.x-dev"
}
```

The above would be changed to:

```
"branch-alias": {
"dev-master": "1.10.x-dev"
}
```

Commit this change:

```
$ git commit -m "Master is now 1.10-dev" composer.json
```

## Releasing

The follow steps outline the release process for a maintenance branch (e.g.
releasing the `vX.Y` branch as X.Y.Z).

### Ensure PHP version compatibility

Ensure that the library test suite completes on supported versions of PHP.

### Transition JIRA issues and version

All issues associated with the release version should be in the "Closed" state
and have a resolution of "Fixed". Issues with other resolutions (e.g.
"Duplicate", "Works as Designed") should be removed from the release version so
that they do not appear in the release notes.

Check the corresponding ".x" fix version to see if it contains any issues that
are resolved as "Fixed" and should be included in this release version.

Update the version's release date and status from the
[Manage Versions](https://jira.mongodb.org/plugins/servlet/project-config/PHPLIB/versions)
page.

### Update version info

The PHP library uses [semantic versioning](http://semver.org/). Do not break
backwards compatibility in a non-major release or your users will kill you.

Before proceeding, ensure that the `master` branch is up-to-date with all code
changes in this maintenance branch. This is important because we will later
merge the ensuing release commits up to master with `--strategy=ours`, which
will ignore changes from the merged commits.

### Tag release

The maintenance branch's HEAD will be the target for our release tag:

```
$ git tag -a -m "Release X.Y.Z" X.Y.Z
```

### Push tags

```
$ git push --tags
```

### Merge the maintenance branch up to master

```
$ git checkout master
$ git merge vX.Y --strategy=ours
$ git push
```

The `--strategy=ours` option ensures that all changes from the merged commits
will be ignored.

### Publish release notes

The following template should be used for creating GitHub release notes via
[this form](https://github.com/mongodb/mongo-php-library/releases/new).

```
The PHP team is happy to announce that version X.Y.Z of the MongoDB PHP library is now available.

**Release Highlights**

A complete list of resolved issues in this release may be found at:
$JIRA_URL

**Documentation**

Documentation for this library may be found at:
https://docs.mongodb.com/php-library/

**Installation**

This library may be installed or upgraded with:

composer require mongodb/mongodb

Installation instructions for the `mongodb` extension may be found in the [PHP.net documentation](http://php.net/manual/en/mongodb.installation.php).
```

The URL for the list of resolved JIRA issues will need to be updated with each
release. You may obtain the list from
[this form](https://jira.mongodb.org/secure/ReleaseNote.jspa?projectId=12483).

If commits from community contributors were included in this release, append the
following section:

```
**Thanks**

Thanks for our community contributors for this release:

* [$CONTRIBUTOR_NAME](https://github.com/$GITHUB_USERNAME)
```

Release announcements should also be sent to the [MongoDB Product & Driver Announcements](https://community.mongodb.com/tags/c/community/release-notes/35/php-driver).

Consider announcing each release on Twitter. Significant releases should also be
announced via [@MongoDB](http://twitter.com/mongodb) as well.

### Documentation Updates for New Major and Minor Versions

New major and minor releases will also require documentation updates to other
projects:

* Create a DOCSP ticket to add the new version to PHP's server and language
[compatibility tables](https://docs.mongodb.com/drivers/php/#compatibility)
in the driver docs portal. See
[mongodb/docs-ecosystem#642](https://github.com/mongodb/docs-ecosystem/pull/642)
for an example.

* Create a DOCSP ticket to update the "current" and "upcoming" navigation links
in the library's [documentation](https://docs.mongodb.com/php-library/). This
will require updating
[mongodb/docs-php-library](https://github.com/mongodb/docs-php-library).

These tasks can be initiated prior to tagging a new release to ensure that the
updated content becomes accessible soon after the release is published.