Submit handler to reset a vocabulary to alphabetical order after confirmation.
taxonomy_vocabulary_confirm_reset_alphabetical()
function taxonomy_vocabulary_confirm_reset_alphabetical_submit($form, &$form_state) {
db_update('taxonomy_term_data')
->fields(array(
'weight' => 0,
))
->condition('vid', $form_state['values']['vid'])
->execute();
drupal_set_message(t('Reset vocabulary %name to alphabetical order.', array(
'%name' => $form_state['values']['name'],
)));
watchdog('taxonomy', 'Reset vocabulary %name to alphabetical order.', array(
'%name' => $form_state['values']['name'],
), WATCHDOG_NOTICE);
$form_state['redirect'] = 'admin/structure/taxonomy/' . $form_state['values']['machine_name'];
}