/**
 * Implements hook_field_formatter_info().
 */
function ft_continent_field_formatter_info() {
  return array(
    'anchor_title' => array(
      'label' => t('Anchor title'),
      'field types' => array('text'),
    ),
  );
}

/**
 * Implements hook_field_formatter_view().
 */
function ft_continent_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
  $element = array();

  switch ($display['type']) {
    // Formatter fo anchor title.
    case 'anchor_title':
      foreach ($items as $delta => $item) {
        $id = drupal_html_id($item['value']);
        $element[$delta] = array('#markup' => '<h3 id="' . $id . '">'. strip_tags($item['value'] . '</h3>'));
      }
      break;
  }

  return $element;
}