KO3 Validation.php

<?php

$form = array(
	'username'    => 'shadowhand',
	'password'    => 'foood',
	'ip'          => '127.0.0.1',
);

$form = Validation::factory($form)
	->rules('username', array(
		'required' => TRUE,
		'regex'    => '/\w[\w_.]{2,30}\w/i',
	))
	->rules('password', array(
		'required'   => TRUE,
		'min_length' => 5,
	))
	->rules('ip', array(
		'ip' => FALSE,
	));

$errors = array();

echo Kohana::debug($form->validate($errors), $errors);
echo Kohana::debug($form->as_array());