Gain insights into functional programming in PHP. Learn about pure functions, immutable data, and monads. Explore error handling and apply principles through practical projects.

fp15aug.tar.gz

php7.4

ch8-phonebook

php8.1

purescript

python-pytoolz

chapter5-challenge1

AMQP

eris-testing-lesson

AMQP-Challenge

eris-testing-challenge

Functional programming is a paradigm that emphasizes expressing program logic as compositions of pure functions. PHP is a good fit for functional programming as functions are first-class citizens in its userland.
 
This course introduces you to the core concepts of functional programming, like pure functions, immutable data structures, and referential transparency. From there, you'll explore ways to handle errors with default values and callbacks while also exploring sum types such as Either or Maybe. Next, you'll look at functors before diving deep into monads, including IO, State, Reader, and List.
 
By the end of this course, you'll have a keen understanding of how to apply these principles in practice through a worked-out project. Not only will you know another way to program, but you’ll also feel confident enough to apply these ideas to your projects in PHP.

Learn Functional Programming in PHP

# What are immutable lists?

An **immutable list** is a persistent data structure. That is, it’s a data structure that maintains its previous version whenever it’s modified. An immutable list always yields an updated version of itself. It’s possible to view an immutable list as an upgrade of constants, which don’t have the properties of persistent structures.

# PHP libraries supporting immutable lists

There exists multiple libraries in PHP capable of enabling the creation of immutable lists. Among the packages with such capability are the [`immutable-php`](https://packagist.org/packages/qaribou/immutable.php) and [`phunkie`](https://packagist.org/packages/phunkie/phunkie) libraries. 

## The `immutable-php` package

The command below demonstrates the installation of the `immutable-php` package.

```
composer require quaribou/immutable.php
```

The code below demonstrates the usage of the installed package.

Learn about the immutable-lists data structure in PHP.

Getting Started

An Introduction to Functional Programming in PHP

Core Concepts: Functional Programming in PHP

Composition and Helper Functions

Error Handling in Functional Programming

Functors in PHP

Parallelization of Tasks in PHP

Recursion, Pattern Matching, and Property Testing

Phonebook Application — A Simple Project

Conclusion

Appendix

Immutable lists

What are immutable lists?

PHP libraries supporting immutable lists