Implementing Eiffel in Laravel 4 is a piece of cake compared to Fuel.

anyFile.php

<?php

class EiffelException extends Exception {
  protected $msg = '';
	protected $http = 500;

	public function __construct($message = null, $code = 0, Exception $previous = null)
	{
		$this->msg = $message ?: $this->msg;
		parent::__construct($this->msg, $code, $previous);
	}

	public function getHttpStatus() { return $this->http; }
}

class NotFound extends EiffelException {
	protected $msg = 'Resource Not Found';
	protected $http = 404;
}

class SaveFailed extends EiffelException {
	protected $msg = 'Save Failed; Please try again later';
	protected $http = 500;
}

class UploadFailed extends EiffelException {
	protected $msg = 'File Upload Failed; Please try again later';
	protected $http = 500;
}

class NotImplemented extends EiffelException {
	protected $msg = 'Not Implemented';
	protected $http = 501;
}

class Unauthorised extends EiffelException {
	protected $msg = 'You must sign in to continue';
	protected $http = 401;
}

class Forbidden extends EiffelException {
	protected $msg = 'You do not have permission to do that';
	protected $http = 403;
}

class Conflict extends EiffelException {
	protected $msg = 'A Conflict Occurred';
	protected $http = 409;
}

class Unknown extends EiffelException {
	protected $msg = 'An unknown error occurred; Please try again later';
	protected $http = 500;
}

class BadRequest extends EiffelException {
	protected $msg = 'Bad request';
	protected $http = 400;
}

class Invalid extends EiffelException {
	protected $msg = 'Validation Failed';
	protected $http = 400;
	protected $errors;
	public function __construct($errors = array(), $message = null, $code = 0, Exception $previous = null)
	{
		$this->errors = $errors;
		parent::__construct();
	}

	public function getErrors() { return $this->errors; }

ApiJobsController.php

<?php

class ApiJobsController extends BaseController
{
  public function index()
  {
    throw new NotImplemented;
  }
  
  public function show($id)
  {
    if ($job = Auth::user()->jobs->find($id))
    {
      return $job; // JSON encoded
    }
    
    throw new NotFound;
  }
}

start.php

<?php

App::error(function(Invalid $e, $code)
{
	return Response::json(array(
		'message' => $e->getMessage(),
		'errors' => $e->getErrors()
	), $e->getHttpStatus());
});

App::error(function(Unauthorised $e, $code)
{
	return Response::json(array(
		'message' => $e->getMessage(),
		'redirect' => 'login'
	), $e->getHttpStatus());
});

App::error(function(EiffelException $e, $code)
{
	return Response::json(array(
		'message' => $e->getMessage()
	), $e->getHttpStatus());
});