LoggerPass.php

<?php


/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Symfony\Component\HttpKernel\DependencyInjection;

use Psr\Log\LoggerInterface;
use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Reference;
use Symfony\Component\HttpFoundation\RequestStack;
use Symfony\Component\HttpKernel\Log\Logger;

/**
 * Registers the default logger if necessary.
 *
 * @author Kévin Dunglas <dunglas@gmail.com>
 */
class LoggerPass implements CompilerPassInterface {
    public function process(ContainerBuilder $container) : void {
        $container->setAlias(LoggerInterface::class, 'logger');
        if ($container->has('logger')) {
            return;
        }
        if ($debug = $container->getParameter('kernel.debug')) {
            $debug = $container->hasParameter('kernel.runtime_mode.web') ? $container->getParameter('kernel.runtime_mode.web') : !\in_array(\PHP_SAPI, [
                'cli',
                'phpdbg',
                'embed',
            ], true);
        }
        $container->register('logger', Logger::class)
            ->setArguments([
            null,
            null,
            null,
            new Reference(RequestStack::class),
            $debug,
        ]);
    }

}