Gain insights into functional programming in PHP. Learn about pure functions, immutable data, and monads. Explore error handling and apply principles through practical projects.

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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

identity object’s neutrality to composition

**(Fill in the blank.)** The three laws of category theory are associativity, identity, and ________.

(Fill in the blank.) The three laws of category theory are associativity, identity, and ________.

**(True or False)** A functor may not preserve the relationship between the objects and arrows in a category.

(True or False) A functor may not preserve the relationship between the objects and arrows in a category.

**(Fill in the blank.)** The `map` function defined on a functor is a/an ________ of a plethora of map operations.

(Fill in the blank.) The <code>map</code> function defined on a functor is a/an ________ of a plethora of map operations.

**(Fill in the blank.)** The internals of a program centered around a counter and the actions that update it can be best tidied away in a ________ monad.

(Fill in the blank.) The internals of a program centered around a counter and the actions that update it can be best tidied away in a ________ monad.

**(Fill in the blank.)** The `do` notation is an alternative means of expressing the ________ associated with monads and, by extension, functors.

(Fill in the blank.) The <code>do</code> notation is an alternative means of expressing the ________ associated with monads and, by extension, functors.

Assess your learning about functors through a quiz.

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

Quiz: Functors in PHP