How to add a new exception handler to Laravel without disable the default one?

I'm using Sentry to keep tracking of exceptions from a Laravel application.

Sentry's docs say I should use the following code in my application bootstrap to setup the client:

$app->configureMonologUsing(function($monolog) {
    $client = new Raven_Client('your dsn');
    $handler = new Monolog\Handler\RavenHandler($client);
    $handler->setFormatter(new Monolog\Formatter\LineFormatter("%message% %context% %extra%\n"));
    $monolog->pushHandler($handler);
});

And that works fine!

The side effect is that Laravel's default exception handler, which writes the exceptions to the file at /storage/logs/laravel.log, stopped to work after adding the new exception handler.

How can I keep both handlers?

UPDATE for Laravel 5.6+

Starting on Laravel 5.6 log stacks are available. It now allows devs to set up multiple log channels with ease. Refer to the docs for more info on that.

Solution

You can look at Illuminate\Foundation\Bootstrap\ConfigureLogging to see how Laravel sets up its native logging. Then in your own bootstrap, just push another handler that does the same:

$app->configureMonologUsing(function($monolog) {

    // Keep your existing Sentry configuration
    $client = new Raven_Client('your dsn');
    $handler = new Monolog\Handler\RavenHandler($client);
    $handler->setFormatter(new Monolog\Formatter\LineFormatter("%message% %context% %extra%\n"));
    $monolog->pushHandler($handler);

    // Add another handler that writes to laravel.log
    $handler = new Monolog\Handler\StreamHandler(storage_path('logs/laravel.log'));
    $handler->setFormatter(new Monolog\Formatter\LineFormatter(null, null, true, true));
    $monolog->pushHandler($handler);

});

Edit:

If you don't need to reproduce Laravel's behaviour exactly, you could use the default formatter for a one-liner addition instead:

$monolog->pushHandler(new Monolog\Handler\StreamHandler(storage_path('logs/laravel.log')));

This differs from the native Laravel implementation in that it'll use the default constructor arguments for LineFormatter rather than those we were setting explicitly before.

A third option that reuses Laravel's logic for configuring Monolog would be the addition of this line instead:

with(new Illuminate\Log\Writer($monolog))->useFiles(storage_path('logs/laravel.log'));