PietroBundle/DependencyInjection/LcPietroExtension.php

<?php

namespace Lc\PietroBundle\DependencyInjection;

use Symfony\Component\Config\FileLocator;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Extension\Extension;
use Symfony\Component\DependencyInjection\Extension\PrependExtensionInterface;
use Symfony\Component\DependencyInjection\Loader\YamlFileLoader;

class LcPietroExtension extends Extension implements PrependExtensionInterface
{

    public function load(array $configs, ContainerBuilder $container)
    {
        $configuration = new Configuration();
        $config = $this->processConfiguration($configuration, $configs);

        foreach ($config as $parameter => $value) {
            $container->setParameter(sprintf('lc_pietro.%s', $parameter), $value);
        }

        $loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
        $loader->load('services.yaml');
    }

    public function prepend(ContainerBuilder $container)
    {
        /*$loader = new YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config/easy_admin'));
        $loader->load('base.yaml');
        $loader->load('entities/merchant.yaml');*/
    }
}