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

## Problem statement

Write a version of PHP’s max function called `_max` that utilizes the `fold` operation of the `bingo-functional` library. Ensure that only non-negative integers are compared and other value types evaluate to `0`.

The `_max` function should receive an array as a parameter and return the integer with the maximum value in the case that the array contains all non-negative integers and a `0` in all other cases.

## Sample inputs and outputs

### Sample input 1
```php
$list = [10,12,14,16,18]
```
### Expected output
```
18
```

### Sample input 2
```php
$list = [-1,-3,-5]
```
### Expected output
```
0
```
### Sample input 3
```php
$list = [a,b,c,d,e]
```
### Expected output
```
0
```

# Problem statement

Write a version of PHP’s max function called `_max` that utilizes the `fold` operation of the `bingo-functional` library. Ensure that only non-negative integers are compared and other value types evaluate to `0`.

The `_max` function should receive an array as a parameter and return the integer with the maximum value in the case that the array contains all non-negative integers and a `0` in all other cases.

# Sample inputs and outputs

## Sample input 1
```php
$list = [10,12,14,16,18]
```
## Expected output
```
18
```

## Sample input 2
```php
$list = [-1,-3,-5]
```
## Expected output
```
0
```
## Sample input 3
```php
$list = [a,b,c,d,e]
```
## Expected output
```
0
```

Test your knowledge by writing a replica function of PHP's max function.

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

Challenge 1: Replica of PHP's "max" Function

Problem statement

Sample inputs and outputs

Sample input 1

Expected output

Sample input 2

Expected output

Sample input 3

Expected output