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

## Background to the Railway pattern

Scott Wlaschin, a prominent promoter of functional programming and a vocal leader in the F# community, advanced the **Railway pattern**, a formula for error handling using controlled function composition. This pattern is a novelty only in name, for it’s nothing more than an elaborate error handling with sum types such as the Either monad.

When dealing with real-world problems, it’s common to deal with both success and failure scenarios. The Railway pattern encourages us to conceive these as two switches on the track. Furthermore, according to the rubric, both pathways should provide similar values to aid in composition. This requires two-switch functions as a prerequisite.


# Background to the Railway pattern

Scott Wlaschin, a prominent promoter of functional programming and a vocal leader in the F# community, advanced the **Railway pattern**, a formula for error handling using controlled function composition. This pattern is a novelty only in name, for it’s nothing more than an elaborate error handling with sum types such as the Either monad.

When dealing with real-world problems, it’s common to deal with both success and failure scenarios. The Railway pattern encourages us to conceive these as two switches on the track. Furthermore, according to the rubric, both pathways should provide similar values to aid in composition. This requires two-switch functions as a prerequisite.


Learn about the railway pattern and its correlation with monads.

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

The Railway Pattern

Background to the Railway pattern