awesome-php/awesome-php.md

# Awesome PHP

A list of amazingly awesome PHP libraries, resources and shiny things.

## Composer

* [Composer](http://getcomposer.org/)/[Packagist](http://packagist.org/) - A package and dependency manager.
* [Composer Installers](https://github.com/composer/installers) - A  multi framework Composer library installer.

## Composer Related

* [Satis](https://github.com/composer/satis) - A static Composer repository generator.
* [Composition](https://github.com/bamarni/composition) - A library to check your Composer environment at runtime.
* [Poser](https://github.com/FrenkyNet/Poser) - A Composer class aliasing library.
* [Version](https://github.com/herrera-io/php-version) - A parsing and comparison library for semantic versioning.
* [NameSpacer](https://github.com/ralphschindler/Namespacer) - A library to convert from underscores to namespaces.
* [Patch Installer](https://github.com/goatherd/patch-installer) - A library to install patches using Composer.

## Frameworks

* [Symfony2](http://symfony.com/) - A framework comprised of individual components.
* [Knp RAD Bundle](http://rad.knplabs.com/) - A Rapid Application Development (RAD) bundle for Symfony 2.
* [Zend Framework 2](http://framework.zend.com) - Another framework comprised of individual components.
* [Laravel 4](http://laravel.com/) - A simple PHP framework.
* [Lithium](http://lithify.me/) - Another framework of components.

## Framework Components

* [Symfony2 Components](http://symfony.com/doc/master/components/index.html) - The components that make Symfony2.
* [Zend Framework 2 Components](https://packages.zendframework.com/) - The components that make ZF2.
* [Aura Components](http://auraphp.github.com/) - A package of PHP 5.4 components. 

## Micro Frameworks

* [Silex](http://silex.sensiolabs.org/) - A micro framework built around Symfony2 components.
* [Silex Skeleton](https://github.com/fabpot/Silex-Skeleton) - A skeleton for Silex.
* [Stack](https://github.com/stackphp) - A library of stackable middleware for Silex/Symfony.
* [Slim](http://www.slimframework.com/) - Another simple micro framework.
* [Slim Skeleton](https://github.com/codeguy/Slim-Skeleton) - A skeleton for Slim.
* [Slim Extras](https://github.com/codeguy/Slim-Extras) - A collection of extras for Slim.
* [Bullet PHP](http://bulletphp.com/) - A mico framework for building REST APIs.
* [Klein](https://github.com/chriso/klein.php) - A fast routing library.

## Templating

* [Twig](http://twig.sensiolabs.org/) - A comprehensive templating language.
* [Twig Cache Extension](https://github.com/asm89/twig-cache-extension) - A template fragment cache library for Twig.
* [Mustache](https://github.com/bobthecow/mustache.php) - A PHP implementation of the Mustache template language.
* [Phly Mustache](https://github.com/weierophinney/phly_mustache) - Another PHP implementation of the Mustache template language.
* [MtHaml](https://github.com/arnaud-lb/MtHaml) - A PHP implementation of the HAML template language.
* [Lex](https://github.com/pyrocms/lex) - A lightweight template parser.

## HTTP

* [Guzzle](http://guzzlephp.org/) - A HTTP client.
* [Buzz](https://github.com/kriswallsmith/Buzz) - Another HTTP client.
* [Requests](https://github.com/rmccue/Requests) - A simple HTTP library.
* [Goutte](https://github.com/fabpot/Goutte) - A simple web scraper.

## URL

* [Purl](https://github.com/jwage/purl) - A URL manipulation library.
* [PHP Domain Parser](https://github.com/jeremykendall/php-domain-parser) - A domain suffix parser library.

## Email

* [SwiftMailer](http://swiftmailer.org/) - A mailer solution.
* [PHPMailer](https://github.com/PHPMailer/PHPMailer) - Another mailer solution.
* [Fetch](https://github.com/tedivm/Fetch) - An IMAP library.
* [Email Reply Parser](https://github.com/willdurand/EmailReplyParser) - An email reply parser library.
* [Stampie](https://github.com/henrikbjorn/Stampie) - A library for email services such as [SendGrid](http://sendgrid.com), [PostMark](http://postmarkapp.com) and [MailGun](http://www.mailgun.com).

## File

* [Gaufrette](https://github.com/KnpLabs/Gaufrette) - A filesystem abstraction layer.
* [Canal](https://github.com/dflydev/dflydev-canal) - A library to determine internet media types.
* [Apache MIME Types](https://github.com/dflydev/dflydev-apache-mime-types) - A library that parses Apache MIME types.
* [Ferret](https://github.com/versionable/Ferret) - A MIME detection library.
* [Lurker](https://github.com/henrikbjorn/Lurker) - A resource tracking library.

## Dependency Injection

* [Pimple](http://pimple.sensiolabs.org/) - A tiny dependency injection container.
* [Auryn](https://github.com/rdlowrey/Auryn) - Another dependency injection container.
* [Di](https://github.com/orno/di) - Another flexible dependency injection container.
* [PHP DI](http://mnapoli.github.com/PHP-DI/) - A dependency injection implementation using annotations.

## Imagery

* [Imagine](http://imagine.readthedocs.org/en/latest/index.html) - An image manipulation library.
* [PHP Image Workshop](https://github.com/Sybio/ImageWorkshop) - Another image manipulation library.
* [GIF Frame Extractor](https://github.com/Sybio/GifFrameExtractor) - A library to extract GIF animation frame information.
* [GIF Creator](https://github.com/Sybio/GifCreator) - A library to create GIF animations from multiple images.

## Testing

* [PHPUnit](https://github.com/sebastianbergmann/phpunit) - A unit testing framework.
* [ParaTest](https://github.com/brianium/paratest) - A parallel testing library for PHPUnit.
* [PHPSpec](https://github.com/phpspec/phpspec2) - A design by specification unit testing library.
* [Codeception](https://github.com/Codeception/Codeception) - A full stack testing framework.
* [Atoum](https://github.com/atoum/atoum) - A simple testing library.
* [Mockery](https://github.com/padraic/mockery) - A mock object library for testing.
* [Phake](https://github.com/mlively/Phake) - Another mock object library for testing.
* [Parody](https://github.com/dotink/Parody) - Yet another mock object library for testing.
* [Sismo](http://sismo.sensiolabs.org/) - A continuous testing server library.
* [Faker](https://github.com/fzaninotto/Faker) - A fake data generator library.
* [Alice](https://github.com/nelmio/alice) - An expressive fixture generation library.
* [Behat](http://behat.org/) - A Behaviour Driven Development framework.
* [Mink](http://mink.behat.org/) - Web acceptance testing.
* [HTTP Mock](https://github.com/InterNations/http-mock) - A library for mocking HTTP requests in unit tests.

## Documentation

* [Sami](https://github.com/fabpot/Sami) - An API documentation generator.
* [PHP Documentor 2](https://github.com/phpDocumentor/phpDocumentor2) - Another documentation generator.

## Security

* [HTML Purifier](https://github.com/ezyang/htmlpurifier) - A standards compliant HTML filter.
* [RandomLib](https://github.com/ircmaxell/RandomLib) - A library for generating random numbers and strings. 
* [SecurityMultiTool](https://github.com/padraic/SecurityMultiTool) - A PHP security library.
* [Password Compat](https://github.com/ircmaxell/password_compat) - A compatibility library for the new PHP 5.5 password functions.
* [PHPAss](http://www.openwall.com/phpass/) - A portable password hashing framework.
* [PHP Password Lib](https://github.com/ircmaxell/PHP-PasswordLib) - A library for generating and validating passwords.
* [Password Policy](https://github.com/ircmaxell/password-policy) - A password policy library for PHP and JavaScript.
* [PHPSecLib](http://phpseclib.sourceforge.net/) - A pure PHP secure communications library.
* [TCrypto](https://github.com/timoh6/TCrypto) - A simple encrypted key-value storage library.
* [PHP IDS](https://github.com/PHPIDS/PHPIDS) - A structured PHP security layer.
* [PHP SSH](https://github.com/Herzult/php-ssh) - An experimental object orientated SSH wrapper library.

## Code Analysis

* [PHP Parser](https://github.com/nikic/PHP-Parser) - A PHP parser written in PHP.
* [Dissect](https://github.com/jakubledl/dissect) - A set of tools for lexical and syntactical analysis.
* [PHP Mess Detector](http://phpmd.org/) - A library that scans code for bugs, sub-optimal code, unused parameters and more.
* [PHP Code Sniffer](https://github.com/squizlabs/PHP_CodeSniffer) - A library that detects PHP, CSS and JS coding standard violations.
* [PHPCPD](https://github.com/sebastianbergmann/phpcpd) - A library that detects copied and pasted code.
* [PHP Analyser](https://github.com/scrutinizer-ci/php-analyzer) - A library for analysing PHP code to find bugs and errors.
* [PHP CS Fixer](https://github.com/fabpot/PHP-CS-Fixer) - A coding standard fixer library.
* [PHP Manipulator](https://github.com/schmittjoh/php-manipulator) - A library for analysing and modifying PHP Source Code.
* [PHP Refactoring Browser](https://github.com/QafooLabs/php-refactoring-browser) - A command line utility for refactoring PHP code.
* [UBench](https://github.com/devster/ubench) - A simple micro benchmark library.

## Build Tools

* [Go](https://github.com/herrera-io/php-go) - A simple PHP build tool.
* [Bob](https://github.com/CHH/bob) - A simple project automation tool.
* [Phake](https://github.com/jaz303/phake) - A rake PHP clone library.
* [Box](https://github.com/kherge/Box) - A utility to build PHAR files.

## Asset Management

* [Assetic](https://github.com/kriswallsmith/assetic) - An asset manager pipeline library.
* [Pipe](https://github.com/CHH/pipe) - Another asset manager pipeline library.
* [Munee](https://github.com/meenie/munee) - An asset optimiser library.
* [JShrink](https://github.com/tedivm/JShrink) - A JavaScript minifier library.

## Geolocation

* [GeoCoder](http://geocoder-php.org/) - A geocoding library.
* [GeoTools](https://github.com/toin0u/Geotools) - A library of geo-related tools.
* [PHPGeo](https://github.com/mjaschen/phpgeo) - A simple geo library.

## Date and Time

* [Carbon](https://github.com/briannesbitt/Carbon) - A simple DateTime API extension.
* [ExpressiveDate](https://github.com/jasonlewis/expressive-date) - Another DateTime API extension.
* [CalendR](http://yohan.giarel.li/CalendR) - A calendar management library.

## Event

* [React](https://github.com/reactphp/react) - An event driven non-blocking I/O library.
* [Ratchet](https://github.com/cboden/Ratchet) - A web socket library.
* [Evenement](https://github.com/igorw/evenement) - An event dispatcher library.
* [FuelPHP Event](https://github.com/fuelphp/event) - Another event dispatcher library.

## Logging

* [Monolog](https://github.com/Seldaek/monolog) - A comprehensive logger.

## Payment

* [OmniPay](https://github.com/adrianmacneil/omnipay) - A framework agnostic multi-gateway payment processing library.
* [Payum](https://github.com/payum/payum) - A payment abstraction library.

## PDF

* [Snappy](https://github.com/KnpLabs/snappy) - A PDF and image generation library.
* [WKHTMLToPDF](https://github.com/antialize/wkhtmltopdf) - A tool to convert HTML to PDF.

## ORM and Datamapping

* [Doctrine](http://www.doctrine-project.org/) - A comprehensive DBAL and ORM.
* [Doctrine Migrations](http://docs.doctrine-project.org/projects/doctrine-migrations/en/latest/toc.html) - A migration library for Doctrine. 
* [Doctrine Extensions](https://github.com/l3pp4rd/DoctrineExtensions) - A collection of Doctrine behavioural extensions.
* [Propel](http://www.propelorm.org/) - A fast ORM.
* [Eloquent](https://github.com/illuminate/database) - The Laravel 4 ORM.
* [Baum](https://github.com/etrepat/baum) - A nested set implementation for Eloquent.
* [Spot](https://github.com/vlucas/Spot) - A MySQL datamapper ORM.
* [PHP ActiveRecord](https://github.com/kla/php-activerecord) - A PHP Active Record implementation.
* [Paris and Idiorm](http://j4mie.github.io/idiormandparis/) - A minimalist database library.
* [Migrations](https://github.com/icomefromthenet/Migrations) - A migration management library.
* [PHPMig](https://github.com/davedevelopment/phpmig) - Another migration management library.
* [Phinx](https://github.com/robmorgan/phinx) - Another database migration library.
* [Entities](https://github.com/kherge/Entities) - A Doctrine ORM service provider for Silex.

## NoSQL

* [MongoQB](https://github.com/alexbilbie/MongoQB) - A MongoDB query builder library.
* [Monga](https://github.com/FrenkyNet/Monga) - A MongoDB abstraction library.
* [Predis](https://github.com/nrk/predis) - A feature complete Redis library.

## Queue

* [Pheanstalk](https://github.com/pda/pheanstalk) - A Beanstalkd client library.
* [PHP AMPQ](https://github.com/videlalvaro/php-amqplib) - An AMPQ library.
* [Thumper](https://github.com/videlalvaro/Thumper) - A RabbitMQ pattern library.

## Command Line

* [Boris](https://github.com/d11wtq/boris) - A tiny PHP REPL.
* [GetOpt](https://github.com/ulrichsg/getopt-php) - A command line opt parser.
* [OptParse](https://github.com/CHH/optparse) - Another command line opt parser.
* [Commando](https://github.com/nategood/commando) - Another simple command line opt parser.
* [Elf](https://github.com/kherge/Elf) - A collection of helpers for the Symfony Console component.
* [Amend](https://github.com/kherge/Amend) - A Symfony Console helper and command set for updating and upgrading applications.
* [Cron Expression](https://github.com/mtdowling/cron-expression) - A library to calculate cron run dates.
* [ShellWrap](https://github.com/MrRio/shellwrap) - A simple command line wrapper library.

## Authentication

* [Sentry](https://github.com/cartalyst/sentry) - A framework agnostic authentication & authorisation library.
* [Sentry Social](http://docs.cartalyst.com/sentry-social-2/introduction) - A library for social network authentication.
* [OPAuth](https://github.com/uzyn/opauth) - A multi-provider authentication framework.

## OAuth

* [OAuth2](https://github.com/php-loep/oauth2-server) - An OAuth2 authentication server, resource server and client library.
* [PHP oAuthLib](https://github.com/Lusitanian/PHPoAuthLib) - Another OAuth library. 
* [TwitterOAuth](https://github.com/ruudk/twitteroauth) - A Twitter OAuth library.

## Markup

* [Decoda](http://milesj.me/code/php/decoda) - A lightweight markup parser library.
* [PHP Markdown](https://github.com/michelf/php-markdown) - A markdown parser library.
* [Dflydev Markdown](https://github.com/dflydev/dflydev-markdown) - Another markdown parser library.
* [HTML5 PHP](https://github.com/Masterminds/html5-php) - An HTML5 parser and serializer library.

## Text and Numbers

* [ANSI to HTML5](https://github.com/sensiolabs/ansi-to-html) - An ANSI to HTML5 convertor library.
* [Patchwork UTF-8](https://github.com/nicolas-grekas/Patchwork-UTF8) - A portable library for working with UTF-8 strings.
* [Numbers PHP](https://github.com/powder96/numbers.php) - A library for working with numbers.
* [Math](https://github.com/moontoast/math) - A library for working with large numbers.
* [Color Jizz](https://github.com/mikeemoo/ColorJizz-PHP) - A library for manipulating and converting colours.
* [UUID](https://github.com/ramsey/uuid) - A library for generating UUIDs.
* [Slugify](https://github.com/cocur/slugify) - A library to convert strings to slugs.
* [Urlify](https://github.com/jbroadway/urlify) - A PHP port of Django's URLify.js.

## Filtering and Validation

* [Filterus](https://github.com/ircmaxell/filterus) - A simple PHP filtering library.
* [Respect Validate](https://github.com/Respect/Validation) - A simple validation library.
* [Valitron](https://github.com/vlucas/valitron) - Another validation library.
* [Upload](https://github.com/codeguy/Upload) - A library for handling file uploads and validation.

## REST and API

* [Hateoas](https://github.com/willdurand/Hateoas) - A HATEOAS REST web service library.
* [HAL](https://github.com/blongden/hal) - A Hypertext Application Language (HAL) builder library.
* [Negotiation](https://github.com/willdurand/Negotiation) - A content negotiation library.

## Caching

* [Cache](https://github.com/doctrine/cache) - A caching library (part of Doctrine).
* [Stash](https://github.com/tedivm/Stash) - Another library for caching.

## Data Structure

* [Ardent](https://github.com/morrisonlevi/Ardent) - A library of data structures.
* [PHP Collections](https://github.com/schmittjoh/php-collection) - A simple collections library.

## Notifications

* [Nod](https://github.com/filp/nod) - A notification library (e.g. Growl).
* [Notificato](https://github.com/wrep/notificato) - A library for handling push notifications.
* [Notification Pusher](https://github.com/Ph3nol/NotificationPusher) - A standalone library for device push notifications.
* [Bernard](https://github.com/henrikbjorn/Bernard) - A structured message library for queues.

## Miscellaneous

* [Spork](https://github.com/kriswallsmith/spork) - A process forking library.
* [JSON Lint](https://github.com/Seldaek/jsonlint) - A JSON lint utility.
* [KnpMenu](https://github.com/KnpLabs/KnpMenu) - A menu library.
* [Pagerfanta](https://github.com/whiteoctober/Pagerfanta) - A pagination library.
* [Ruler](https://github.com/bobthecow/Ruler) - A simple stateless production rules engine.
* [Serializer](https://github.com/schmittjoh/serializer) - A library for serialising and de-serialising data.
* [LiteCQRS](https://github.com/beberlei/litecqrs-php) - A CQRS (Command Query Responsibility Separation) library.
* [S3 Stream Wrapper](https://github.com/gwkunze/S3StreamWrapper) - A stream wrapper library for Amazon S3.
* [Sslurp](https://github.com/EvanDotPro/Sslurp) - A library that makes dealing with SSL suck less.
* [Streamer](https://github.com/fzaninotto/Streamer) - A simple object-orientated stream wrapper library.
* [PHP Option](https://github.com/schmittjoh/php-option) An option type library.
* [Metrics](https://github.com/beberlei/metrics) - A simple metrics API library.
* [Sabre VObject](https://github.com/evert/sabre-vobject) - A library for parsing VCard and iCalendar objects.
* [Annotations](https://github.com/doctrine/annotations) - An annotations library (part of Doctrine).
* [PHP File Locator](https://github.com/herrera-io/php-file-locator) - A library for locating files in large projects.
* [Elastica](https://github.com/ruflin/Elastica) - A client library for [Elastic Search](http://www.elasticsearch.org/).
* [Whoops](https://github.com/filp/whoops) - A pretty error handling library.
* [Finite](http://yohan.giarel.li/Finite) - A simple PHP finite state machine.
* [LadyBug](https://github.com/raulfraile/Ladybug) - A dumper library.
* [Plum](https://github.com/aerialls/Plum) - A deployer library.
* [Procrastinator](https://github.com/lstrojny/Procrastinator) - A library for running time consuming tasks.
* [Compose](https://github.com/igorw/compose) - A function composition library.
* [SuperClosure](https://github.com/jeremeamia/super_closure) - A library that allows Closures to be serialized.
* [Jumper](https://github.com/kakawait/Jumper) - A remote service executor library.
* [Underscore](http://brianhaveri.github.io/Underscore.php/) - A PHP port of the Underscore JS library.
* [PHP PassBook](https://github.com/eymengunay/php-passbook) - A PHP library for iOS PassBook.
* [PHP Expression](https://github.com/Kitano/php-expression) - A PHP expression language.
* [RMT](https://github.com/liip/RMT) - A library for versioning and releasing software.
* [Wise](https://github.com/herrera-io/php-wise) - A configuration manager.

## Official APIs

* [Amazon Web Service SDK](https://github.com/aws/aws-sdk-php) - The official PHP AWS SDK library.
* [Stripe](https://github.com/stripe/stripe-php) - The official Stripe PHP library.
* [Campaign Monitor](http://campaignmonitor.github.com/createsend-php/) - The official Campaign Monitor PHP library.

## Utilities

* [HomeBrew](http://mxcl.github.com/homebrew/) - A package manager for OSX.
* [HomeBrew PHP](https://github.com/josegonzalez/homebrew-php) - A PHP tap for HomeBrew.
* [PHP OSX](http://php-osx.liip.ch/) - A PHP installer for OSX.
* [Vagrant](http://www.vagrantup.com/) - A portable development environment utility.
* [PuPHPet](https://puphpet.com/) - A web tool for building PHP development virtual machines.
* [PHP Brew](https://github.com/c9s/phpbrew) - A PHP version manager and installer.
* [PHP Env](https://github.com/CHH/phpenv) - Another PHP version manager.
* [PHP Switch](https://github.com/jubianchi/phpswitch) - Another version manager.
* [PHP Build](https://github.com/CHH/php-build) - Another PHP version installer.
* [PHP Queue](https://github.com/CoderKungfu/php-queue) - An application for managing queueing backends.
* [PHPPHP](https://github.com/ircmaxell/PHPPHP) - A PHP VM implementation in PHP.
* [PHPSandbox](https://github.com/fieryprophet/php-sandbox) - A PHP sandbox environment.
* [PHPStack](http://dunkels.com/adam/phpstack/) - A TCP/IP stack proof of concept written in PHP.
* [SensioLabs Security Check](https://security.sensiolabs.org/) - A web tool to check your Composer dependecies for security advisories.
* [Scrutinizer](https://scrutinizer-ci.com/) - A web tool to scrutinise PHP code.
* [Zed](https://www.owasp.org/index.php/OWASP_Zed_Attack_Proxy_Project) - An integrated penetration testing tool for web applications.
* [DBV](http://dbv.vizuina.com/) - A database version control application.
* [Travis CI](https://travis-ci.org/) - A continuous integration platform.
* [Locust](http://locust.io/) - A modern load test library written in Python.
* [Country List](https://github.com/umpirsky/country-list) - A list of all countries with names and ISO 3166-1 codes.

# Resources

* [PHP The Right Way](http://www.phptherightway.com/) - A PHP best practice quick reference guide.
* [PHP Best Practices](http://phpbestpractices.org/) - A PHP best practice guide.
* [PHP Weekly](http://phpweekly.info/archive/) - A weekly PHP newsletter.
* [PHP Security](http://phpsecurity.readthedocs.org/en/latest/index.html) - A guide to PHP security.
* [PHP Internals](http://www.phpinternalsbook.com/) - A book about the PHP internals.
* [PHP Standards Working Group](https://groups.google.com/group/php-standards) - The PHP standards working group.
* [The Open Web Application Security Project (OWASP)](https://www.owasp.org/index.php/Main_Page) - An open software security community.
* [WebSec IO](http://websec.io/) - A web security community resource.
* [Web Advent](http://webadvent.org) - An advent calendar for web developers.
* [Programming with Anthony](http://www.youtube.com/playlist?list=PLM-218uGSX3DQ3KsB5NJnuOqPqc5CW2kW) - A video series by Anthony Ferrara.

## E-Books

* [Scaling PHP Applications](http://www.scalingphpbook.com) - An ebook about scaling PHP applications by Steve Corona.
* [Grumpy PHPUnit](https://leanpub.com/grumpy-phpunit) - A book about unit testing with PHPUnit by Chris Hartjes.

## Reading

* [OWASP PHP Security Cheat Sheet](https://www.owasp.org/index.php/PHP_Security_Cheat_Sheet) - A PHP security cheatsheet.
* [Seven Ways to Screw Up BCrypt](http://blog.ircmaxell.com/2012/12/seven-ways-to-screw-up-bcrypt.html) - An article about correct BCrypt implementation.
* [Preventing CSRF Attacks](http://blog.ircmaxell.com/2013/02/preventing-csrf-attacks.html) - An article on preventing CSRF attacks.
* [Print vs Echo, Which One is Faster?](http://fabien.potencier.org/article/8/print-vs-echo-which-one-is-faster) - An article about print and echo performance.
* [The PHP Ternary Operator. Fast or Not?](http://fabien.potencier.org/article/48/the-php-ternary-operator-fast-or-not) - An article ternary performance.
* [On PHP 5.3, Lamda Functions and Closures](http://fabien.potencier.org/article/17/on-php-5-3-lambda-functions-and-closures) - An article about lambda functions and closures.
* [Use Env](http://seancoates.com/blogs/use-env) - An article about using the unix environment helper.
* [Disproving the Single Quotes Myth](http://nikic.github.com/2012/01/09/Disproving-the-Single-Quotes-Performance-Myth.html) - An article about performance of single and double quoted strings.
* [You're Being Lied To](http://blog.golemon.com/2007/01/youre-being-lied-to.html) - An article about internal ZVALs.
* [How Long is a Piece of String](http://blog.golemon.com/2006/06/how-long-is-piece-of-string.html) - An article about string internals.
* [Understanding OpCodes](http://blog.golemon.com/2008/01/understanding-opcodes.html) - An article about opcodes.
* [How Foreach Works](http://stackoverflow.com/questions/10057671/how-foreach-actually-works/14854568#14854568) - A detailed StackOverflow answer about foreach.
* [When Does Foreach Copy?](http://nikic.github.com/2011/11/11/PHP-Internals-When-does-foreach-copy.html) - An article about the internals of foreach.
* [How Big Are PHP Arrays (And Values) Really?](http://nikic.github.com/2011/12/12/How-big-are-PHP-arrays-really-Hint-BIG.html) - An article about array internals.
* PHP Source Code for Developers: [1](http://blog.ircmaxell.com/2012/03/phps-source-code-for-php-developers.html) [2](http://nikic.github.com/2012/03/16/Understanding-PHPs-internal-function-definitions.html) [3](http://blog.ircmaxell.com/2012/03/phps-source-code-for-php-developers_21.html) [4](http://nikic.github.com/2012/03/28/Understanding-PHPs-internal-array-implementation.html) - A series about the PHP source code.
* Collecting Garbage: [1](http://www.php.net/manual/en/features.gc.refcounting-basics.php) [2](http://www.php.net/manual/en/features.gc.collecting-cycles.php) [3](http://www.php.net/manual/en/features.gc.performance-considerations.php) - A series about the PHP garbage collection internals.
* [Semantic Versioning](http://semver.org/) - A website explaining semantic versioning.
* [Composer Primer](http://daylerees.com/composer-primer) - A Composer primer.
* [Composer Versioning](https://igor.io/2013/01/07/composer-versioning.html) - An article about Composer versioning.
* [Composer Stability Flags](https://igor.io/2013/02/07/composer-stability-flags.html) - An article about Composer stability flags.
* [PHP Sucks! But I Like It!](http://blog.ircmaxell.com/2012/04/php-sucks-but-i-like-it.html) - An article about the pros and cons of PHP.
* [PHP Is Much Better Than You Think](http://fabien.potencier.org/article/64/php-is-much-better-than-you-think) - An article about the PHP lanaguage and ecosystem.
* [Innocent Villagefolk or a Pillagin’ Pirate?](http://blog.astrumfutura.com/2012/04/php-innocent-villagefolk-or-a-pillagin-pirate/) - An article about PHP taking ideas from other language.
* [Predicting Random Numbers in PHP](http://blog.astrumfutura.com/2013/03/predicting-random-numbers-in-php-its-easier-than-you-think/) - An article about generating random numbers.
* [C is for Cookie, H is for Hacker](http://www.troyhunt.com/2013/03/c-is-for-cookie-h-is-for-hacker.html) - An article about cookies and security.
* [You Blew It Loading Your Login Form Over HTTP](http://www.troyhunt.com/2013/05/your-login-form-posts-to-https-but-you.html) - An article about using HTTPS correctly with login forms.
* [A 20 Point List for Preventing XSS in PHP](http://blog.astrumfutura.com/2013/04/20-point-list-for-preventing-cross-site-scripting-in-php/) - An article about preventing XSS.
* [A Beginners Guide to HTTP Cache Headers](http://www.mobify.com/blog/beginners-guide-to-http-cache-headers/) - An article about HTTP cache headers.