How do you usually use the Composer tool?

Composer is a dependency manager for PHP. I usually use it for:

1. Installing and managing third-party libraries and frameworks. Composer makes it easy to add, update, and remove project dependencies.

   // composer.json
   {
       "require": {
           "monolog/monolog": "2.0.*"
       }
   }
   

   composer install
   composer update
   composer remove monolog/monolog
   

2. Autoloading classes. Composer generates an autoloader based on the composer.json file, eliminating the need to manually include files.

   // composer.json
   {
       "autoload": {
           "psr-4": {
               "App\\": "src/"
           }
       }
   }
   

   // index.php
   require __DIR__ . '/vendor/autoload.php';
   
   use App\MyClass;
   
   $obj = new MyClass();
   

3. Defining scripts. Composer allows defining custom commands for various tasks such as testing, deployment, or static analysis.

   // composer.json
   {
       "scripts": {
           "test": "phpunit",
           "deploy": [
               "git push",
               "ssh user@host 'cd /var/www/html && composer install --no-dev'"
           ]
       }
   }
   

   composer test
   composer deploy
   

4. Creating and publishing your libraries. Composer helps structure library projects correctly and easily publish them on Packagist.

5. Managing PHP package versions. Composer supports various version constraints (e.g., ~2.0, ^3.0, >=7.4) to ensure compatibility.

6. Using global dependencies (though less frequently). Sometimes I use composer global require for tools like PHPUnit or PHP_CodeSniffer, but I prefer to install them locally in each project for better isolation.

Overall, Composer is an indispensable tool in my daily PHP work, greatly simplifying project and dependency management.