Composer - Pros & Cons

Composer basics
Composer 

 https://getcomposer.org  › doc › 01-basic-usage 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 To start using  Composer  in your project, all you need is a  composer .json file. This file describes the dependencies of your project and may contain other ... See more 

 

 

 

 

 

 JSON schema 

 

 

 

 Libraries 

 

 

 

 Versions and constraints 

 

 

 

 Autoloader optimization 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 Composer basics  revolve around it being  a  dependency manager for PHP , letting you declare libraries your project needs in a  composer.json  file, and then automatically installing, updating, and autoloading them via simple command-line tools like  composer install  and  composer require , saving immense time by managing third-party code (like Guzzle, PHPUnit) so you don't have to manually find and manage them. It works per-project, creating a  vendor  directory and an  autoload.php  file for seamless class loading, similar to npm for JavaScript or Bundler for Ruby.   

 This video provides a beginner-friendly introduction to Composer:

 

 

 

 

 

 

 

 

 1m 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 StudyStream+ 

 YouTube • 25 Apr 2016 

 

 

 

 

 

 

 

 

 

 Core Concepts & Workflow: 

 

 Dependency Declaration : Define your project's external libraries (packages) in  composer.json  (e.g.,  ramsey/uuid  for UUIDs,  guzzlehttp/guzzle  for HTTP requests). 

 Installation : Run  composer install  in your project's root directory to download and install declared dependencies into the  vendor  folder, respecting versions in  composer.lock  if it exists, or creating it if not. 

 Adding New Packages : Use  composer require vendor/package-name  to add a new library, which updates  composer.json ,  composer.lock , and installs the package. 

 Autoloading : Include  require 'vendor/autoload.php';  at the top of your main PHP file to automatically load classes from installed packages, eliminating manual  require  statements. 

 Updating/Managing : Use  composer update  to find newer versions of packages, and  composer update vendor/package  to update specific ones.   

 

 You can watch this video to see how to use Composer to install packages:

 

 

 

 

 

 

 

 

 57s 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 Dave Hollingworth 

 YouTube • 2 May 2024 

 

 

 

 

 

 

 

 

 

 Key Files & Folders: 

 

 composer.json : Your project's manifest, listing dependencies and versions. 

 composer.lock : Locks exact package versions to ensure consistent installations across environments. 

 vendor/ : Directory where Composer installs all downloaded packages and the autoloader.   

 

 This video explains the initial setup and use of Composer:

 

 

 

 

 

 

 

 

 1m 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 Laracasts 

 YouTube • 1 Nov 2023 

 

 

 

 

 

 

 

 

 

 Basic Commands: 

 

 composer install : Installs dependencies from  composer.json  /  composer.lock . 

 composer require vendor/package : Adds and installs a new package. 

 composer update : Updates packages to newer compatible versions. 

 composer dump-autoload : Regenerates the autoloader.  

How to switch in different composer version in ubuntu
To switch between different Composer versions on Ubuntu, particularly between major versions like Composer 1 and Composer 2, you can use the self-update command with specific flags. 

 

 

 Switching between Composer 1 and Composer 2: 

 

 

 

 

 To switch to Composer 1. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 composer self-update --1 

 

 

 

 

 

 To switch to Composer 2.  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 composer self-update --2 

 

 

 Other useful self-update commands: 

 

 

 

 

 

 To update to the latest stable version (usually Composer 2): 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 composer self-update 

 

 

 

 To revert to the previous Composer version: 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 composer self-update --rollback 

 

 

 

 To preview a new Composer version before updating: 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 composer self-update --preview 

 

 

 Important Notes: 

 

 

 

 

 

 If you encounter permission errors when running composer self-update , you might need to run it with sudo , like sudo composer self-update --2 . However, be cautious when using sudo with Composer, as it can sometimes lead to permission issues in your user's home directory. 

 Ensure your PHP environment is compatible with the Composer version you are switching to. Different Composer versions might have different PHP version requirements. 

 After switching versions, you can verify the current Composer version by running: 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 composer --version