symfony/config v7.0.6

Symfony/config is a powerful tool that facilitates finding, loading, combining, autofilling, and validating configuration values of any kind. Whether your data source is a YAML, XML, INI file, or a database, Symfony/config is able to handle it, making it a versatile and crucial component in modern web development.

To use Symfony/config, you first need to install it via composer with the command composer require symfony/config. Once installed, you can create a new instance of a ConfigBuilder and call its methods to configure your application. As Symfony/config supports many different types of configuration files, the exact code usage may vary. For XML configurations, for instance, you might use the XmlFileLoader class; for YAML files, the YamlFileLoader class would be applicable.

Here's a simple usage example:

<?php
use Symfony\Component\Config\FileLocator;
use Symfony\Component\Config\Loader\DelegatingLoader;
use Symfony\Component\Config\Loader\LoaderResolver;
use Symfony\Component\Config\Loader\YamlFileLoader;

// The FileLocator needs a list of directories where it should look for files
$locator = new FileLocator([__DIR__]);

// Create the resolver
$resolver = new LoaderResolver();

// Add some loaders to it (here, a YamlFileLoader example)
$resolver->addLoader(new YamlFileLoader($locator));

// Create the delegating loader 
$loader = new DelegatingLoader($resolver);

// Now you can load your configuration files
$configValues = $loader->load(__DIR__.'/config.yaml');

You can find the Symfony/config documentation on the official Symfony website. Detailed, informational resources about the component, including all its features and functions, are available at https://symfony.com/doc/current/components/config.html. In these documents, you can learn how to properly use Symfony/config, understand best practices, and read about possible issues and solutions.