Immutable

Installation

Library can be installed into any PHP application:

• Using Composer dependency manager
• The Force for the Jedi Developers

$ composer require phpfn/immutable

In order to access library make sure to include vendor/autoload.php in your file.

<?php

require __DIR__ . '/vendor/autoload.php';

Usage

To ensure immunity of objects, you just need to wrap any code of your method in a closure.

Mutable object example:

class Example
{
    private int $value = 42;

    public function update(int $newValue): self
    {
        $this->value = $newValue;
    
        return $this;
    }
}

Making it immutable:

class Example
{
    private int $value = 42;

    // Sample #1 (PHP 7.4+)
    public function with(int $newValue): self
    {
        return immutable(fn () => $this->value = $newValue);
    }
}

That`s all!