function form_test($form, &$form_state) {
    if (empty($form_state['str']['step'])) {
        $array_sh = array('1', '2', '3', '4');
        shuffle($array_sh);
        $form_state['str']['shu'] = $array_sh;
        $form_state['str']['step'] = 'test';
        $form_state['str']['count'] = 0;
    }
    switch ($form_state['str']['step']) {
        case 'test':
            $form['step_var'] = array(
                '#markup' => 'Шаг: test , Count: '. $form_state['str']['count'] . ' ' . implode('|', $form_state['str']['shu']),
            );
        break;
    }

    $form['submit'] = array(
        '#type' => 'submit',
        '#value' => 'Next',
    );
    return $form;
}

function form_test_submit($form, &$form_state) {
    $form_state['rebuild'] = TRUE;
    $form_state['str']['count']++;
}