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

# Performance improvement with subsequent versions

You’re probably already familiar with PHP 7.4 and later versions. The performance and syntax improvements in these versions are proof of the language’s continued improvement. PHP’s new short closure syntax (arrow functions), first-class callable syntax, and typed properties are all valuable for functional programming. In situations that warrant their usage:

- Short closures reduce program code verbosity.

- The first-class callable syntax makes shuttling functions with multiple arguments a more straightforward task.

- Typed properties enforce strictness inside class contexts and enhance class code readability.

> **Note:** Other features like preloading and the Foreign Function Interface (FFI) present performance improvements but may require finesse to operationalize.
 

# Example

The code given below contains examples of some the new features in PHP:

- A class with typed properties

- An array filter operation using the `array_filter` method

- An array concatenation through unpacking (works with arrays with string keys in versions 8.1 and newer)






Learn how PHP is getting better with each version.

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

PHP is Getting Better

Performance improvement with subsequent versions