Setting up Composer on Linux

Posted on October 20, 2025

PHP Composer is a popular dependency manager for PHP that simplifies the process of installing and managing libraries and packages in your PHP projects. Here’s a brief overview:

Key Features:

  1. Dependency Management: Composer allows you to declare the libraries your project depends on and manages them for you.
  2. Package Installation: Composer installs packages and their dependencies, ensuring version compatibility.
  3. Autoloading: Composer generates autoload files, making it easy to use packages without manual includes.
  4. Version Control: Composer tracks package versions, allowing for easy updates and rollbacks.

Basic Commands:

  1. composer init: Initializes a new Composer project.
  2. composer require: Installs a package and its dependencies.
  3. composer update: Updates packages to the latest versions.
  4. composer install: Installs dependencies listed in composer.json.

Benefits:

  1. Easy Dependency Management: Simplifies managing complex dependencies.
  2. Package Ecosystem: Access to a vast repository of PHP packages.
  3. Version Control: Ensures consistent and reproducible environments.

Composer is widely used in PHP frameworks like Laravel and Symfony, and is an essential tool for modern PHP development.

Installation script

#!/bin/bash

echo "Installing Composer..."
php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');"
php -r "if (hash_file('sha384', 'composer-setup.php') === 'ed0feb545ba87161262f2d45a633e34f591ebb3381f2e0063c345ebea4d228dd0043083717770234ec00c5a9f9593792') { echo 'Installer verified'.PHP_EOL; } else { echo 'Installer corrupt'.PHP_EOL; unlink('composer-setup.php'); exit(1); }"
php composer-setup.php
php -r "unlink('composer-setup.php');"
sudo mv composer.phar /usr/local/bin/composer
echo -e "\nDone\n"

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