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

## Registry functions in `actions.php`

It’s impossible to complete the application without factoring in the registry-related functionalities that correspond to the other more sophisticated patterns in the table, that is, interaction with a registry and, therefore, the filesystem. Working with a flat-file registry, or any file for that matter, means that many of the actions performed on the said entity are some variation of read and write operations, or sometimes a mix of both.

Read and write are impure operations, much like printing to a standard output device (a console) and, as such, warrant the usage of the IO monad. The mostly empty bodies of the functions defined in the snippet below are imperative to realizing a fully functioning phonebook.


# Registry functions in `actions.php`

It’s impossible to complete the application without factoring in the registry-related functionalities that correspond to the other more sophisticated patterns in the table, that is, interaction with a registry and, therefore, the filesystem. Working with a flat-file registry, or any file for that matter, means that many of the actions performed on the said entity are some variation of read and write operations, or sometimes a mix of both.

Read and write are impure operations, much like printing to a standard output device (a console) and, as such, warrant the usage of the IO monad. The mostly empty bodies of the functions defined in the snippet below are imperative to realizing a fully functioning phonebook.


Learn about the implementation of different functions written in the actions.php file for our phonebook registry.

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

Implementation of Registry Functionalities

Registry functions in `actions.php`