$validation = Validation::factory($data);
$validation->add_callbacks('mobile', array($this, 'checkphone'));
if ($validation->check())
{
     die('OK');
}
else
{
     die('FALSE');
}

......

class Validation extends Kohana_Validation {

    /**
     * Returns the array of data to be validated.
     * @var $data mixed
     * @return  array
     */
    public function data($data = NULL)
    {
        if ( ! is_null($data))
        {
            $this->_data = $data;
        }

        return $this->_data;
    }

    /*
     * personal rule
     * @author - Василий Блаженный
     */
    public function checkphone(Validation $array, $field) {
        return preg_match("/^\+?([87](?!95[4-79]|99[^2457]|907|94[^0]|336)([348]\d|9[0-689]|7[027])\d{8}|[1246]\d{9,13}|68\d{7}|5[1-46-9]\d{8,12}|55[1-9]\d{9}|500[56]\d{4}|5016\d{6}|5068\d{7}|502[45]\d{7}|5037\d{7}|50[457]\d{8}|50855\d{4}|509[34]\d{7}|376\d{6}|855\d{8}|856\d{10}|85[0-4789]\d{8,10}|8[68]\d{10,11}|8[14]\d{10}|82\d{9,10}|852\d{8}|90\d{10}|96(0[79]|17[01]|13)\d{6}|96[23]\d{9}|964\d{10}|96(5[69]|89)\d{7}|96(65|77)\d{8}|92[023]\d{9}|91[1879]\d{9}|9[34]7\d{8}|959\d{7}|989\d{9}|97\d{8,12}|99[^456]\d{7,11}|994\d{9}|9955\d{8}|996[57]\d{8}|380[34569]\d{8}|381\d{9}|385\d{8,9}|375[234]\d{8}|372\d{7,8}|37[0-4]\d{8}|37[6-9]\d{7,11}|30[69]\d{9}|34[67]\d{8}|3[12359]\d{8,12}|36\d{9}|38[1679]\d{8}|382\d{8,9})$/", preg_replace("/[^0-9]/i","", $array[$field]));
    }
}

Fatal error: Call to undefined method Validation::add_callbacks() in C:\OpenServer\domains\v7-2.pervonax.loc\modules\connection\classes\Connection\Mobile.php on line 10