DRUPAL*DRUPAL

<?php
// $Id: hiragana_captcha.admin.inc,v 1.0 2008/06/29 0829 Exp $

/**
 * Administration form.
 */
function hiragana_captcha_settings_form() {
  $form = array();
  $form['hiragana_captcha_words'] = array(
    '#type' => 'fieldset',
    '#title' => t('Words settings'),
    '#description' => t('Input the generated word length and number of words in the phrase for hiragana CAPTCHA.'),
  );
  $form['hiragana_captcha_words']['hiragana_captcha_length_min'] = array(
    '#type' => 'textfield',
    '#title' => t('Minimum number of characters'),
    '#default_value' => variable_get('hiragana_captcha_length_min', 3),
    '#size' => 2,
    '#maxlength' => 2,
  );
  $form['hiragana_captcha_words']['hiragana_captcha_length_max'] = array(
    '#type' => 'textfield',
    '#title' => t('Maximum number of characters'),
    '#default_value' => variable_get('hiragana_captcha_length_max', 3),
    '#size' => 2,
    '#maxlength' => 2,
  );
  $form['hiragana_captcha_words']['hiragana_captcha_quantity'] = array(
    '#type' => 'textfield',
    '#title' => t('Number of words in the phrase'),
    '#default_value' => variable_get('hiragana_captcha_quantity', 5),
    '#size' => 2,
    '#maxlength' => 2,
  );
  $form['#validate'][] = 'hiragana_captcha_settings_form_validate';
  return system_settings_form($form);
}

/**
 * Validate function of the administration form.
 */
function hiragana_captcha_settings_form_validate($form, &$form_state) {
  if ($form_state['values']['hiragana_captcha_length_min'] < 1 || $form_state['values']['hiragana_captcha_length_max'] < 1) {
    form_set_error('hiragana_captcha_length', t('Minimum and maximum number of characters should be more than \'1\'.'));
  }
  else if ($form_state['values']['hiragana_captcha_length_min'] > $form_state['values']['hiragana_captcha_length_max']) {
    form_set_error('hiragana_captcha_length', t('Maximum number of characters should be more than minimum number of characters.'));
  }
  if ($form_state['values']['hiragana_captcha_quantity'] < 4 || $form_state['values']['hiragana_captcha_quantity'] > 10) {
    form_set_error('hiragana_captcha_quantity', t('Number of words in the phrase should be between 4 and 10.'));
  }
}