laravel中的HTTP异常和日志

App::abort(‘404‘,‘Page not found‘);
App::abort(‘401‘,‘You are not authorized‘);
App::missing(function($exception){
  return  Response::view(‘errors.missing‘,array(),404);
});

//
Log::info(‘This is some usefull information‘);
Log::warning("Somting could be going wrong");
Log::error(‘Somting is really going wrong‘);
Log::listen(function($level,$message,$context){

});
$monolog = Log::getMonolog();