convert_exception.php

<?php

require_once dirname(__DIR__).'/vendor/autoload.php';

class IAmATeaPodException extends \Exception
{
}
class UnderConstructionException extends \Exception
{
}

$app = new \Silex\Application(['debug' => true]);

$app->register(new \Glaubinix\Silex\Provider\ConvertExceptionProvider(), [
    'qafoo.exception_class_map' => [
        'IAmATeaPodException' => '419',
        'UnderConstructionException' => \InvalidArgumentException::class,
    ],
]);

$app->get('/', function () {
    throw new UnderConstructionException();
});

// accessing /teapod will return 419 status code
$app->get('/teapod', function () {
    throw new IAmATeaPodException();
});

$app->run();