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

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ch8-phonebook

php8.1

purescript

python-pytoolz

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AMQP

eris-testing-lesson

AMQP-Challenge

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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

This chapter aims to demonstrate how to build a simple phonebook as a shell REPL in a functional programming style. The goal of this project is to write user-facing command-line software without any frameworks or packages designed to ease the process like `hoa` and `reactphp-stdio`. The application showcases ideas discussed throughout the course.

PHP has evolved to become a language capable of creating applications that reside in a frontier outside the quintessential web scripting domain: semaphores, daemons, and even web servers exist in the realm of possibility for PHP developers. The console app in this chapter offers some refreshment in its deviation from typical web projects.

Get an overview of the phonebook project and its file structure.

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

Phonebook Overview