Add additional fields to search form

Hi
The module's forms are built using the Drupal form api.
You can use hook_form_alter to add your fields and manipulate the search results.
See api.drupal.org for more information on hook_form_alter.

Lee

There's a drupal_alter('hotel_booking_available_rooms') in the module but the search results are also a form.
If you analyse the form you'll see there's $form['results'] for the results - these are keyed by node and you can access your fields from form_state['values']. You can unset the invalid ones.

Hi
It's the same form (hotel_booking_search_form), but the results are appended, something like this will get you started (you need the devel module installed):

function MYMODULE_form_hotel_booking_search_form_alter(&$form, $form_state) {
  if (isset($form['results'])) {
    dsm($form['results']); // You can see how the results are structured here.
    dsm($form_state['values']); //You can access your custom field values here
  }
}

Obviously change MYMODULE to your module's name