Phunkie Effect

A functional effects library for PHP inspired by Scala's cats-effect. Phunkie Effect provides a way to manage side effects in a purely functional way, making your code more predictable, testable, and maintainable.

Installation

composer require phunkie/effect

Requirements

• PHP 8.2 or higher

Basic Usage

IO Monad

The IO monad is the primary way to handle effects in Phunkie Effects. It allows you to wrap side effects in a pure functional context. Following Phunkie's design philosophy, we use traits to extend types and functions to construct and manipulate them.

use Phunkie\Effect\Functions\io\io;
use Phunkie\Effect\IO\IO;

// Create an IO from a pure value using the io function
$pure = io(42);

// Create an IO from a side effect
$effect = io(function() {
    return file_get_contents('data.txt');
});

// Map over an IO using the FunctorOps trait
$mapped = $effect->map(function($content) {
    return strtoupper($content);
});

// Chain IOs using the MonadOps trait
$chained = $effect->flatMap(function($content) {
    return io(function() use ($content) {
        return file_put_contents('output.txt', $content);
    });
});

IOApp

IOApp provides a way to run your IO programs. It's the entry point for your effectful applications.

use Phunkie\Effect\Functions\io\io;
use Phunkie\Effect\IO\IO;
use Phunkie\Effect\IO\IOApp;

class MyApp extends IOApp
{
    public function run(): IO
    {
        return io(function() {
            echo "Hello, Effects!";
            return 0;
        });
    }
}

To run your application, use the Phunkie console:

$ bin/phunkie MyApp
Hello, Effects!

Features

• Pure functional effect handling
• Type-safe IO operations
• Composable effect chains
• Error handling through Either
• Resource management
• Concurrency support (coming soon)

Why Phunkie Effects?

• Type Safety: Catch errors at compile time
• Referential Transparency: Same input always produces the same output
• Testability: Easier to test pure functions
• Composability: Build complex programs from simple, pure functions
• Resource Management: Safe handling of resources like files and network connections

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Acknowledgments

• Inspired by cats-effect
• Built on top of Phunkie