use Sergiors\Silex\PheanstalkServiceProvider;

$app->register(new PheanstalkServiceProvider(), [
    'pheanstalk.options' => [
        'server' => '',
        'port' => ''
    ]
]);

$app['pheanstalk']
    ->useTube('test')
    ->put(json_encode([
        'name' => 'Kirk'
    ]));