Your first Kohana 3.1 controller

bootstrap-example.php

<?php
// Excerpt from bootstrap.php

Kohana::init(
	array(
		'base_url'   => '/',
		'index_file' => '', // Important
	)
);

bootstrap-route-basic.php

<?php
Route::set('hello', '')
	->defaults(
		array(
			'controller' => 'hello',
		)
	);

bootstrap-route-param.php

<?php
Route::set('hello', '(<name>)')
	->defaults(
		array(
			'controller' => 'hello',
		)
	);

hello-basic.php

<?php defined('SYSPATH') or die('No direct script access.');

class Controller_Hello extends Controller {

	public function action_index()
	{
		$this->response->body('hello world');
	}

}

hello-param.php

<?php defined('SYSPATH') or die('No direct script access.');

class Controller_Hello extends Controller {

	public function action_index()
	{
		$name = $this->request->param('name', 'world');
		$this->response->body("hello {$name}");
	}

}