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1. drupal
   1. drupal6
   2. drupal7

Validate callback.

Code

modules/search/search.admin.inc, line 75

<?php
function search_admin_settings_validate($form, &$form_state) {
  if ($form_state['values']['op'] == t('Re-index site')) {
    drupal_goto('admin/settings/search/wipe');
  }
  // If these settings change, the index needs to be rebuilt.
  if ((variable_get('minimum_word_size', 3) != $form_state['values']['minimum_word_size']) || 
      (variable_get('overlap_cjk', TRUE) != $form_state['values']['overlap_cjk'])) {
    drupal_set_message(t('The index will be rebuilt.'));
    search_wipe();
  }
}
?>