awesome-php.md

@@ -2,49 +2,82 @@
 
 A list of amazingly awesome PHP libraries that you should consider using (and some other shiny extras).
 
+
+## 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.
+
+## Dependency Management
+
 * [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/kherge/Version) - A parsing and comparison library for semantic versioning.
+* [NameSpacer](https://github.com/ralphschindler/Namespacer) - A library to convert from underscores to namespaces.
+
+## Frameworks
+
 * [Symfony2](http://symfony.com/) - A framework comprised of individual components.
 * [Zend Framework 2](http://framework.zend.com) - Another framework comprised of individual components.
 * [Laravel 4](https://github.com/laravel/framework) - 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.
 * [Slim](http://www.slimframework.com/) - Another simple micro framework.
 * [Bullet PHP](http://bulletphp.com/) - A mico framework for building REST APIs.
+
+## 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.
+* [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.
+* [Fetch](https://github.com/tedivm/Fetch) - An IMAP library.
+* [Email Reply Parser](https://github.com/willdurand/EmailReplyParser) - An email reply parser 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.
-* [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.
-* [Migrations](https://github.com/icomefromthenet/Migrations) - A migration management library.
-* [Phinx](https://github.com/robmorgan/phinx) - Another database migration library.
-* [Propel](http://www.propelorm.org/) - A fast ORM.
-* [Spot](https://github.com/vlucas/Spot) - A MySQL datamapper ORM.
-* [Goutte](https://github.com/fabpot/Goutte) - A simple web scraper.
-* [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.
+
+## 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.
-* [Monolog](https://github.com/Seldaek/monolog) - A comprehensive logger.
-* [Behat](http://behat.org/) - A Behaviour Driven Development framework.
-* [Mink](http://mink.behat.org/) - Web acceptance testing.
-* [Guzzle](http://guzzlephp.org/) - A HTTP client.
-* [Buzz](https://github.com/kriswallsmith/Buzz) - Another HTTP client.
+
+## Testing
+
 * [PHPUnit](https://github.com/sebastianbergmann/phpunit) - A unit testing framework.
 * [RunkitTestCase](https://github.com/kherge/RunkitTestCase) - A library for creating PHPUnit test cases that use runkit.
 * [ParaTest](https://github.com/brianium/paratest) - A parallel testing library for PHPUnit.
@@ -54,113 +87,185 @@ A list of amazingly awesome PHP libraries that you should consider using (and so
 * [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.
-* [KnpMenu](https://github.com/KnpLabs/KnpMenu) - A menu library.
-* [Gaufrette](https://github.com/KnpLabs/Gaufrette) - A filesystem abstraction layer.
-* [Snappy](https://github.com/KnpLabs/snappy) - A PDF and image generation library (uses [WKHTMLToPDF](https://github.com/antialize/wkhtmltopdf)).
-* [Pagerfanta](https://github.com/whiteoctober/Pagerfanta) - A pagination library.
-* [GeoCoder](http://geocoder-php.org/) - A geocoding library.
-* [GeoTools](https://github.com/toin0u/Geotools) - A library of geo-related tools.
+* [Sismo](http://sismo.sensiolabs.org/) - A continuous testing server library.
 * [Faker](https://github.com/fzaninotto/Faker) - A fake data generator library.
-* [Spork](https://github.com/kriswallsmith/spork) - A process forking library.
-* [HTML Purifier](https://github.com/ezyang/htmlpurifier) - A standards compliant HTML filter.
-* [React](https://github.com/reactphp/react) - An event driven non-blocking I/O library.
-* [Événement](https://github.com/igorw/evenement) - An event dispatcher library.
-* [FuelPHP Event](https://github.com/fuelphp/event) - Another event dispatcher 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.
+
+## Documentation
+
 * [Sami](https://github.com/fabpot/Sami) - An API documentation generator.
 * [PHP Documentor 2](https://github.com/phpDocumentor/phpDocumentor2) - Another documentation generator.
-* [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.
-* [JSON Lint](https://github.com/Seldaek/jsonlint) - A JSON lint utility.
+
+## 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.
+* [BCrypt](https://github.com/kherge/Bcrypt) - A BCrypt password hashing library.
 * [PHPAss](http://www.openwall.com/phpass/) - A portable password hashing framework.
-* [PHPSecLib](http://phpseclib.sourceforge.net/) - A pure PHP secure communications library.
 * [PHP Password Lib](https://github.com/ircmaxell/PHP-PasswordLib) - A library for generating and validating passwords.
-* [Password Compat](https://github.com/ircmaxell/password_compat) - A library that provides compatibility with the new PHP 5.5 password functions.
 * [Password Policy](https://github.com/ircmaxell/password-policy) - A password policy library for PHP and JavaScript.
-* [RandomLib](https://github.com/ircmaxell/RandomLib) - A library for generating random numbers and strings. 
-* [SecurityMultiTool](https://github.com/padraic/SecurityMultiTool) - A PHP security library.
-* [Box](https://github.com/kherge/Box) - A utility to build PHAR files.
-* [Wisdom](https://github.com/kherge/Wisdom) - A library for loading config data.
-* [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.
+* [PHPSecLib](http://phpseclib.sourceforge.net/) - A pure PHP secure communications library.
 * [TCrypto](https://github.com/timoh6/TCrypto) - A simple encrypted key-value storage library.
-* [OmniPay](https://github.com/adrianmacneil/omnipay) - A framework agnostic multi-gateway payment processing library.
-* [Ruler](https://github.com/bobthecow/Ruler) - A simple stateless production rules engine.
+
+## 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.
+
+## Date and Time
+
 * [Carbon](https://github.com/briannesbitt/Carbon) - A simple DateTime API extension.
 * [Datum](https://github.com/dandoescode/datum) - A fork of the Carbon DateTime API extension.
 * [ExpressiveDate](https://github.com/jasonlewis/expressive-date) - Another DateTime API extension.
-* [Upload](https://github.com/codeguy/Upload) - A library for handling file uploads and validation.
-* [Sismo](http://sismo.sensiolabs.org/) - A continuous testing server library.
-* [Fetch](https://github.com/tedivm/Fetch) - An IMAP library.
-* [Email Reply Parser](https://github.com/willdurand/EmailReplyParser) - An email reply parser library.
-* [Lex](https://github.com/pyrocms/lex) - A lightweight template parser.
-* [Sslurp](https://github.com/EvanDotPro/Sslurp) - A library that makes dealing with SSL suck less.
-* [Composition](https://github.com/bamarni/composition) - A library to check your Composer environment at runtime.
+* [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.
+* [Événement](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.
+
+
+## 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.
+* [Spot](https://github.com/vlucas/Spot) - A MySQL datamapper ORM.
+* [Migrations](https://github.com/icomefromthenet/Migrations) - A 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.
+
+## 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.
-* [Doctrine Extensions](https://github.com/l3pp4rd/DoctrineExtensions) - A collection of Doctrine behavioural extensions.
+* [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.
+* [OPAuth](https://github.com/uzyn/opauth) - A multi-provider authentication framework.
+
+## OAuth
+
+* [OAuth2](https://github.com/lncd/OAuth2) - 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.
+
+## 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.
 * [Color Jizz](https://github.com/mikeemoo/ColorJizz-PHP) - A library for manipulating and converting colours.
-* [Poser](https://github.com/FrenkyNet/Poser) - A Composer class aliasing library.
-* [Version](https://github.com/kherge/Version) - A parsing and comparison library for semantic versioning.
+
+## 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.
-* [BCrypt](https://github.com/kherge/Bcrypt) - A BCrypt password hashing library.
-* [ShellWrap](https://github.com/MrRio/shellwrap) - A simple command line wrapper library.
-* [Streamer](https://github.com/fzaninotto/Streamer) - A simple object-orientated stream wrapper library.
-* [Cron Expression](https://github.com/mtdowling/cron-expression) - A library to calculate cron run dates.
-* [OPAuth](https://github.com/uzyn/opauth) - A multi-provider authentication framework.
-* [Ratchet](https://github.com/cboden/Ratchet) - A web socket library.
-* [Alice](https://github.com/nelmio/alice) - An expressive fixture generation library.
-* [PHP Option](https://github.com/schmittjoh/php-option) An option type 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.
-* [Metrics](https://github.com/beberlei/metrics) - A simple metrics API library.
-* [JShrink](https://github.com/tedivm/JShrink) - A JavaScript minifier library.
-* [Ardent](https://github.com/morrisonlevi/Ardent) - A library of data structures.
 * [HAL](https://github.com/blongden/hal) - A Hypertext Application Language (HAL) builder library.
-* [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.
-* [Sabre VObject](https://github.com/evert/sabre-vobject) - A library for parsing VCard and iCalendar objects.
-* [OAuth2](https://github.com/lncd/OAuth2) - An OAuth2 authentication server, resource server and client library.
-* [PHP oAuthLib](https://github.com/Lusitanian/PHPoAuthLib) - Another OAuth library.
-* [Annotations](https://github.com/doctrine/annotations) - An annotations library (part of Doctrine).
+
+## Caching
+
 * [Cache](https://github.com/doctrine/cache) - A caching library (part of Doctrine).
 * [Stash](https://github.com/tedivm/Stash) - Another library for caching.
-* [Filterus](https://github.com/ircmaxell/filterus) - A simple PHP filtering library.
+
+## Data
+
+* [Ardent](https://github.com/morrisonlevi/Ardent) - A library of data structures.
 * [PHP Collections](https://github.com/schmittjoh/php-collection) - A simple collections library.
-* [PHP Domain Parser](https://github.com/jeremykendall/php-domain-parser) - A domain suffix parser library.
-* [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/).
+
+## 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.
+* [Gaufrette](https://github.com/KnpLabs/Gaufrette) - A filesystem abstraction layer.
+* [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.
-* [Numbers PHP](https://github.com/powder96/numbers.php) - A library for working with numbers.
-* [Patchwork UTF-8](https://github.com/nicolas-grekas/Patchwork-UTF8) - A portable library for working with UTF-8 strings.
-* [Boris](https://github.com/d11wtq/boris) - A tiny PHP REPL.
 * [LiteCQRS](https://github.com/beberlei/litecqrs-php) - A CQRS (Command Query Responsibility Separation) library.
-* [NameSpacer](https://github.com/ralphschindler/Namespacer) - A library to convert from underscores to namespaces.
-* [Purl](https://github.com/jwage/purl) - A URL manipulation library.
 * [S3 Stream Wrapper](https://github.com/gwkunze/S3StreamWrapper) - A stream wrapper library for Amazon S3.
-* [TwitterOAuth](https://github.com/ruudk/twitteroauth) - A Twitter OAuth library.
+* [Wisdom](https://github.com/kherge/Wisdom) - A library for loading config data.
+* [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.
-* [CalendR](http://yohan.giarel.li/CalendR) - A calendar management 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.
-* [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.
-* [ANSI to HTML5](https://github.com/sensiolabs/ansi-to-html) - An ANSI to HTML5 convertor library.
 * [Procrastinator](https://github.com/lstrojny/Procrastinator) - A library for running time consuming tasks.
-* [Sentry](https://github.com/cartalyst/sentry) - A framework agnostic authentication & authorisation library.
 
-# Official APIs
+
+## 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
+## 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.
@@ -193,11 +298,13 @@ A list of amazingly awesome PHP libraries that you should consider using (and so
 * [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) - A paid 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.
-* [Semantic Versioning](http://semver.org/) - A website explaining semantic versioning.
 
-# Reading
+## 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.
@@ -215,6 +322,7 @@ A list of amazingly awesome PHP libraries that you should consider using (and so
 * [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://derickrethans.nl/collecting-garbage-phps-take-on-variables.html) [2](http://derickrethans.nl/collecting-garbage-cleaning-up.html) [3](http://derickrethans.nl/collecting-garbage-performance-considerations.html) - 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.