(PHP) Using route groups in Laravel to protect routes

To protect routes, in Laravel, from unauthorized visits you can use route groups.
All routes in group will be affected by the auth before filter.

Route::group(array('before' => 'auth'), function() {

    Route::get('controlpanel', 'CustomerPanel@showPanel');
    Route::get('secret', 'Secret@showSecret');
    Route::post('setup', 'SetupController@doSetup');

});