A collection of resources to introduce functional programming for PHP programmers. Please see CONTRIBUTING for details and contribute. ;)

• Tutorials
• Videos
• Slides
• Libraries
• Other Languages
• People

Functional programming tutorials in PHP.

• Paradigm Soup by Anthony Ferrara - Tutorial that explains the difference between programming paradigms.
• Functional Programming in PHP by PHP The Right Way - Section about functional programming in PHP The Right Way.
• Functional Programming in PHP by Tuts Plus - Tutorial about functional programming in PHP.
• Functional Programming in PHP by Sitepoint - Another tutorial about functional programming in PHP.
• Functional Programming in PHP by Liip - Another tutorial about functional programming in PHP.
• What are PHP Lambdas and Closures? - Tutorial that explains what is lambdas and closures.
• On PHP 5.3, Lambda Functions, and Closures - Another tutorial about lambdas and closures.
• Currying vs Partial Application - Tutorial that explains the difference between currying and partials.
• Using Partial Application in PHP - Tutorial about partial functions in PHP.
• Memoization or function cache - Tutorial about memoization in PHP.
• Taking Monads to OOP PHP - Tutorial about monads in PHP.
• Functional programming with Monads in PHP - Another tutorial about monads in PHP.
• PHP Functions - Documentation of how functions work in PHP.
• Anonymous Functions - Documentation of how anonymous functions works in PHP.
• Array Map, Array Filter e Array Reduce - Documentation about map, filter and reduce functions in PHP.
• Type Hinting - Difference between Closure and Callable - Difference between Closure and Callable typehints in PHP.
• Callable and is_callable - Documentation about Callable typehint and is_callable function.
• Closure Object Binding in PHP 5.4 - Tutorial about closure object binding in PHP.
• PHP Function Objects - Tutorial about function objects in PHP.
• Namespace PHP functions - Tutorial about namespaces and functions in PHP.

Videos about functional programming in PHP.

• Functional PHP by Larry Garfield - Fantastic talk about functional programming in PHP.
• Go Mad for Monads - Talk about monads in PHP.

Slides about functional programming in PHP.

• Functional PHP - Fantastic talk about functional programming in PHP.

Libraries about functional programming in PHP and related concepts.

• Iter
• Functional PHP
• Underscore.php
• Underscore.php
• php-functional
• monad-php
• Partial
• Promise
• Compose
• transducers-php
• Pramda

Some fantastic functional programming languages that you should learn.

• Clojure
• Elixir
• Erlang
• F#
• Haskell
• Lisp
• OCaml
• Scala

Some fantastic and influential developers that talk about functional programming, PHP and other languages.

• Anthony Ferrara - Co-author of PHP Internals book and Developer Advocate for Google.
• Benjamin Eberlei - Project-leader of Doctrine ORM and contributor to the Symfony2 Framework.
• Igor Wiedler - Creator of Silex micro-framework and open-source contributor to projects like Symfony and Composer.
• Joe Armstrong - Creator of Erlang language.
• José Valim - Creator of Elixir language.
• Larry Garfield - PHP developer and core contributor of Drupal.
• Lars Strojny - PHP developer and creator of Functional PHP library.
• Nikita Popov - Co-author of PHP Internals book, open source contributor and creator of PHP Parser library.
• Simon Holywell - Co-author of PHP Internals book, open source contributor and creator of PHP Parser library.