Component\Core\Immutable

FlorianWolters\Component\Core\Immutable is a simple-to-use PHP component that implements the Immutable Object implementation pattern.

Table of Contents (ToC)

• Introduction
• Features
• Requirements
• Usage
• Installation
• As A Dependency On Your Component
• Contributing
• Credits
• License

Introduction

An object is considered immutable if its state cannot change after it is constructed. Maximum reliance on immutable objects is widely accepted as a sound strategy for creating simple, reliable code.

[...]

Programmers are often reluctant to employ immutable objects, because they worry about the cost of creating a new object as opposed to updating an object in place. The impact of object creation is often overestimated, and can be offset by some of the efficiencies associated with immutable objects. These include decreased overhead due to garbage collection, and the elimination of code needed to protect mutable objects from corruption.

-- Immutable Objects (The Java Tutorials)

Features

• Artifacts tested with both static and dynamic test procedures:
  • Dynamic component tests (unit and integration tests) implemented with PHPUnit.
  • Static code analysis performed using the following tools:
    • PHP_CodeSniffer: Style Checker
    • PHP Mess Detector (PHPMD): Code Analyzer
    • PHP Depend: Code Metrics
    • phpcpd: Copy/Paste Detector (CPD)
    • phpdcd: Dead Code Detector (DCD)
    • SensioLabs Security Checker: Security Checker
  • Continuous Integration (CI) using the following web services:
    • Scrutinizer CI
    • SensioLabsInsight
    • Coveralls
    • VersionEye
    • Depending
    • Waffle
• Provides a Packagist package which can be installed using the dependency manager Composer. Click here for the package on Packagist.
• Provides a complete Application Programming Interface (API) documentation generated with the documentation generator phpDocumentor. Click here for the API documentation.
• Follows the following "standards" from the PHP Framework Interoperability Group (FIG). PSR stands for PHP Standards Recommendation:

  • PSR-0: Autoloading Standards

    Aims to provide a standard file, class and namespace convention to allow plug-and-play code.

  • PSR-1: Basic Coding Standard

    Aims to ensure a high level of technical interoperability between shared PHP code.

  • PSR-2: Coding Style Guide

    Provides a Coding Style Guide for projects looking to standardize their code.

  • PSR-4: Autoloader

    A more modern take on autoloading reflecting advances in the ecosystem.

• Follows the Semantic Versioning (SemVer) specification version 2.0.0.

Requirements

Production

• PHP >= 5.4
• Composer
• FlorianWolters/PHP-Component-Core-Immutable

Development

• PHPUnit
• phpcpd
• phpdcd
• PHP_CodeSniffer
• PHP Mess Detector (PHPMD)
• PDepend
• phpDocumentor
• SensioLabs Security Checker
• php-coveralls

Usage

The best documentation for FlorianWolters\Component\Core\Immutable are the unit tests, which are shipped in the package.

Installation

FlorianWolters\Component\Core\Immutable should be installed using the dependency manager Composer.

Composer is a tool for dependency management in PHP. It allows you to declare the dependent libraries your project needs and it will install them in your project for you.

The Composer installer can be downloaded with php.

php -r "readfile('https://getcomposer.org/installer');" | php

This will just check a few PHP settings and then download composer.phar to your working directory. This file is the Composer binary. It is a PHAR (PHP archive), which is an archive format for PHP which can be run on the command line, amongst other things.

To resolve and download dependencies, run the install command:

php composer.phar install

As A Dependency On Your Component

If you are creating a component that relies on FlorianWolters\Component\Core\Immutable, please make sure that you add FlorianWolters\Component\Core\Immutable to your component's composer.json file:

{
    "require": {
        "florianwolters/component-core-immutable": "0.2.*"
    }
}

Contributing

See CONTRIBUTING.md.

Credits

• Florian Wolters
• All Contributors

License

This program is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this program. If not, see http://gnu.org/licenses/lgpl.txt.