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

## Overview

The `Calculator` type class, which is the focal point of this chapter, is only a microcosm of monad practicality. The reality is that the versatility of monads renders them convenient for solving generic problems. The most pervasive monads applicable to real-world problems are IO, State, Reader, List, and Writer monads. They have immense value in their innate generic qualities.

## Monad functions

Monads provide specialized environments for function chaining or composition. Fundamentally, monads are specialized containers and are chainable. Functional programming languages, especially Haskell, provide their users with monad helper functions as built-in abstractions for programming aided by monads. Implementing the said functions in PHP requires some effort but yields semantically similar results.

# Overview

The `Calculator` type class, which is the focal point of this chapter, is only a microcosm of monad practicality. The reality is that the versatility of monads renders them convenient for solving generic problems. The most pervasive monads applicable to real-world problems are IO, State, Reader, List, and Writer monads. They have immense value in their innate generic qualities.

# Monad functions

Monads provide specialized environments for function chaining or composition. Fundamentally, monads are specialized containers and are chainable. Functional programming languages, especially Haskell, provide their users with monad helper functions as built-in abstractions for programming aided by monads. Implementing the said functions in PHP requires some effort but yields semantically similar results.

Learn about some practical monads like the IO monad and the Reader monad with examples.

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

Practical Monads

Overview

Monad functions