NOTE: functional-php used to come with a C extension that implemented most of the functions natively. As the performance differences weren’t that huge compared to the maintenance cost it has been removed.

A set of functional primitives for PHP, heavily inspired by Scala’s traversable collection, Dojo’s array functions and Underscore.js

• Works with arrays and everything implementing interface Traversable
• Consistent interface: for functions taking collections and callbacks, first parameter is always the collection, than the callback. Callbacks are always passed $value, $index, $collection. Strict comparison is the default but can be changed
• Calls 5.3 closures as well as usual callbacks
• All functions reside in namespace Functional to not raise conflicts with any other extension or library

Put the require statement for functional-php in your composer.json file and run php composer.phar install:

{
    "require": {
        "lstrojny/functional-php": "~1.2"
    }
}

Read the docs

To install all dependencies type composer install

To run the test suite type composer run tests

• General help and development list: http://groups.google.com/group/functional-php
• Commit list: http://groups.google.com/group/functional-php-commits

• Richard Quadling and Pierre Joye for Windows build help
• David Soria Parra for various ideas and the userland version of Functional\flatten()
• Max Beutel for Functional\unique(), Functional\invoke_first(), Functional\invoke_last() and all the discussions
• The people behind Travis CI for continuous integration