Drupal → Вывод псевдо-поля при просмотре материала

/**
 * Implements hook_field_extra_fields().
 */
function mymodule_field_extra_fields() {
  // 'node' - Entity type
  // 'article' - Bundle name
  // 'display' - 'display' or 'form'
  // 'mymodule_author' - Field name
  $extra_fields['node']['article']['display']['mymodule_author'] = array(
    'label' => t('Author'),            // Label
    'description' => t('Author name'), // Description
    'weight' => 0,                     // Default weight
  );
  return $extra_fields;
}
 
/**
 * Implements hook_node_view().
 */
function mymodule_node_view($node, $view_mode, $langcode) {
  static $extra_fields = array();
 
  $key = $node->type . ':' . $view_mode;
  if (!isset($extra_fields[$key])) {
    $extra_fields[$key] = field_extra_fields_get_display('node', $node->type, $view_mode);
  }
 
  if (isset($extra_fields[$key]['mymodule_author']) && $extra_fields[$key]['mymodule_author']['visible']) {
    $node->content['mymodule_author'] = array(
      '#markup' => '<b>Author</b>: ' . $node->name,
      '#weight' => $extra_fields[$key]['mymodule_author']['weight'],
    );
  }
}