<?php
function site_settings_menu() {
  $menus['admin/settings/custom'] = array(
    'title' => '網站設定',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('custom_admin_settings'),
    'access callback' => 'user_access',
    'access arguments' => array('access administration menu'),
  );

  return $menus;
}

function custom_admin_settings() {
  $form['year_num'] = array(
    '#type' => 'textfield',
    '#title' => t('每年度開學月份'),
	  '#description' => '每年度開學月份，1-12月',
	  '#element_validate' => array('element_validate_integer_positive'),
    '#default_value' => variable_get('year_num', ''),
  );
  return system_settings_form($form);
}

function custom_admin_settings_validate($form, &$form_state){
  $year_num = $form_state['values']['year_num'];
	if ($year_num < 1 || $year_num > 12){
        form_set_error('year_num', '必須為1-12');
    }
}

function filterInput($input)
{
	return strip_tags(trim($input));
}