function hook_field_formatter_info in Content Construction Kit (CCK) 5
Declare information about a formatter.
Return value
An array keyed by formatter name. Each element of the array is an associative array with these keys and values:
- "label": The human-readable label for the formatter.
- "field types": An array of field type names that can be displayed using this formatter.
4 functions implement hook_field_formatter_info()
Note: this list is generated by pattern matching, so it may include some functions that are not actually implementations of this hook.
- nodereference_field_formatter_info in ./nodereference.module 
- Implementation of hook_field_formatter_info().
- number_field_formatter_info in ./number.module 
- Implementation of hook_field_formatter_info().
- text_field_formatter_info in ./text.module 
- Implementation of hook_field_formatter_info().
- userreference_field_formatter_info in ./userreference.module 
- Implementation of hook_field_formatter_info().
1 invocation of hook_field_formatter_info()
- _content_type_info in ./content.module 
- Collate all information on content types, fields, and related structures.
File
- ./field.php, line 238 
- These hooks are defined by field modules, modules that define a new kind of field for insertion in a content type.
Code
function hook_field_formatter_info() {
  return array(
    'default' => array(
      'label' => t('Default'),
      'field types' => array(
        'text',
      ),
    ),
    'plain' => array(
      'label' => t('Plain text'),
      'field types' => array(
        'text',
      ),
    ),
    'trimmed' => array(
      'label' => t('Trimmed'),
      'field types' => array(
        'text',
      ),
    ),
  );
}