Overriding the log interface container binding lumen 5.0 - php

Question

I am trying to override where lumen writes logs, from 'storage/logs/lumen.log' to 'php://stderr'. The following code is what I am currently trying, and it does not work as expected.
No errors are thrown, and my logs are still written to the default location (in the storage/logs folder).
And when I do:
dd(app('Psr\Log\LoggerInterface'));
I get the default implementation.
Did I misinterpret the documentation, or am I approaching this the wrong way?
<?php namespace App\Providers;
use Monolog\Logger;
use Monolog\Handler\StreamHandler;
use Monolog\Formatter\LineFormatter;
use Illuminate\Support\ServiceProvider;
class AppServiceProvider extends ServiceProvider
{
/**
* Register any application services.
*
* #return void
*/
public function register()
{
app()->instance('Psr\Log\LoggerInterface', new Logger('lumen', [$this->getMonologHandler()]));
}
public function getMonologHandler() {
return (new StreamHandler('php://stderr', Logger::DEBUG))->setFormatter(new LineFormatter(null, null, true, true));
}
}

Answer 1

You'll need to extend \Laravel\Lumen\Application and override the registerLogBindings() and/or getMonologHandler() method to set up your own logging config.

Answer 2

Here's a clean solution that doesn't require you to extend the application:
<?php
namespace App\Providers;
use Illuminate\Support\ServiceProvider;
use Monolog\Formatter\LineFormatter;
use Monolog\Handler\RotatingFileHandler;
class LogServiceProvider extends ServiceProvider
{
/**
* Configure logging on boot.
*
* #return void
*/
public function boot()
{
$maxFiles = 5;
$handlers[] = (new RotatingFileHandler(storage_path('logs/lumen.log'), $maxFiles))
->setFormatter(new LineFormatter(null, null, true, true));
$this->app['log']->setHandlers($handlers);
}
/**
* Register the log service.
*
* #return void
*/
public function register()
{
// Log binding already registered in vendor/laravel/lumen-framework/src/Application.php.
}
}
Then don't forget to add the service provider to your Lumen bootstrap/app.php:
$app->register(\App\Providers\LogServiceProvider::class);