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

class Model_Bla extends ORM {

    public function rules()
    {
        return array(
            'phone_one' => array(
                array('at_least', array($this, 1, array('phone_one', 'phone_two', 'phone_three'))),
            ),
            'phone_two' => array(
                array('at_least', array($this, 1, array('phone_one', 'phone_two', 'phone_three'))),
            ),
            'phone_three' => array(
                array('at_least', array($this, 1, array('phone_one', 'phone_two', 'phone_three'))),
            ),
        );
    }
}