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Jonathan Reinink I live in Canada. I have been writing PHP for 18 years. I spent a decade at marketing agency. I am now a contract developer. 

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What is a package? 

Packages are important because they provide code you don’t have to write. 

Today there are 139,000 PHP package available on Packagist. 

packagist.org/statistics 

Packages are a BIG part of what makes a language successful. 

Have you ever contributed an open-source PHP package? 

Contributing to open-source helps both you as developer and the greater PHP ecosystem. 

If your business relies heavily on certain packages, those are great places to get involved. 

Creating packages can be a little intimidating. 

Introducing The PHP Package Checklist phppackagechecklist.com 

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Recommendations for open-source packages, but applicable to any PHP library. 

Pick a name wisely 

Have a unique identifier in your package name. 

Twig Guzzle Monolog Flysystem Swift Mailer Eloquent Blade Aura 

Ensure the name isn't already used by another project. 

Maintain consistency between this name and your PHP namespace. 

Avoid using last names or personal handles in your PHP namespaces. 

// Good: namespace Glide; namespace League\Glide; // Avoid: namespace Reinink\Glide; namespace Images; namespace ImageManipulations; namespace PHPGlide; namespace YoloImages; 

Host source openly 

Hosting your code openly encourages: • Contributions • Downloads • Code Reviews • Bug Reports 

Recommendation: GitHub 

Even if you prefer Bitbucket, SourceForge, or Google Code, your end users most likely won’t. 

Autoloader friendly 

Use a PSR-4 compatible autoloader namespace. 

Distribute via Composer 

$ composer require league/glide 

{ "name": "league/glide", "require": { "intervention/image": "^2.1", "league/flysystem": "^1.0", "php": "^5.4 | ^7.0", "psr/http-message": "^1.0" }, "autoload": { "psr-4": { "League\\Glide\\": "src/" } } } 

List your library on Packagist, the main Composer repository. 

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Committing your composer.lock file has no impact on your end users. 

Place code in the /src folder. 

Framework agnostic 

Don't limit your library to one framework. 

Offer framework specific support for your package using service providers. 

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Follow a coding style 

Highly recommended that you adhere to the PSR-2 coding style guide. 

A familiar coding style makes open-source code easier to contribute to. 

Do this quickly with an automated code fixer like PHP Coding Standards Fixer. cs.sensiolabs.org 

You can also use services like Nitpick or StyleCI to help you with this. 

Write unit tests 

Aim to cover the majority of your code. 

PHPUnit is the de facto testing framework in PHP. 

Alternatives: phpspec, Behat, atoum, Codeception. 

DocBlock your code 

/** * Set source file system. * @param Filesystem $source Source file system. */ public function setSource(Filesystem $source) { $this->source = $source; } 

DocBlock serve as inline documentation. 

They can also improve code completion in IDEs, like PhpStorm. 

Can be automatically converted into API documentation.
 (see phpDocumentor) 

Use semantic versioning 

Follow the pattern: MAJOR.MINOR.PATCH BREAKING.NEW-FEATURES.BUG-FIXES 

Semantic versioning allows developers to upgrade libraries safely. 

semver.org 

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Keep a changelog 

Show notable changes that have been made between releases. 

Consider following the Keep a CHANGELOG format. (see keepachangelog.com) 

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{% for release in site.github.releases %} ## [{{ release.name }}]({{ release.html_url }}) - {{ release.published_at | date: "%Y-%m-%d" }} {{ release.body | markdownify }} {% endfor %} 

Use continuous integration 

Use a service to automatically check coding standards and run tests. 

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Write extensive documentation 

“Tests are hard so we practice to get better. Docs are hard… so we don’t write any and complain.” — Steve Klabnik, Senior Technical Writer (maintainer of the official Rust documentation) 

Don’t release an open source package unless your committed to writing good documentation. 

Consider hosting documentation on GitHub Pages. 

The formula to awesome docs:
 Tomorrow at 11am 

Include a license 

See choosealicense.com. Most PHP projects use the MIT License. 

The MIT License Copyright (c) Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

At a minimum, include a LICENSE file with your library. 

Welcome contributions 

Have a CONTRIBUTING file, welcoming contributions to the project. 

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Thanks! Follow me on Twitter at @reinink. Please rate this talk at joind.in/talk/74e5f.