| field_access | Determine whether the user has access to a given field. |
| field_associate_fields | Allows a module to update the database for fields and columns it controls. |
| field_bundle_settings | Gets or sets administratively defined bundle settings. |
| field_cache_clear | Clear the field info and field data caches. |
| field_cron | Implements hook_cron(). |
| field_extract_bundle | Helper function to extract the bundle name of from a bundle object. |
| field_extra_fields_get_display | Returns the display settings to use for pseudo-fields in a given view mode. |
| field_filter_xss | Like filter_xss_admin(), but with a shorter list of allowed tags. |
| field_flush_caches | Implements hook_flush_caches(). |
| field_get_default_value | Helper function to get the default value for a field on an entity. |
| field_get_display | Returns the display settings to use for an instance in a given view mode. |
| field_get_items | Returns the field items in the language they currently would be displayed. |
| field_has_data | Determine whether a field has any data. |
| field_help | Implements hook_help(). |
| field_modules_disabled | Implements hook_modules_disabled(). |
| field_modules_enabled | Implements hook_modules_enabled(). |
| field_permission | Implements hook_permission(). |
| field_sync_field_status | Refreshes the 'active' and 'storage_active' columns for fields. |
| field_system_info_alter | Implements hook_system_info_alter(). |
| field_theme | Implements hook_theme(). |
| field_view_field | Returns a renderable array for the value of a single field in an entity. |
| field_view_mode_settings | Returns view mode settings in a given bundle. |
| field_view_value | Returns a renderable array for a single field value. |
| template_preprocess_field | Theme preprocess function for theme_field() and field.tpl.php. |
| template_process_field | Theme process function for theme_field() and field.tpl.php. |
| theme_field | Returns HTML for a field. |
| _element_validate_integer | DEPRECATED: Helper form element validator: integer. |
| _element_validate_integer_positive | DEPRECATED: Helper form element validator: integer > 0. |
| _element_validate_number | DEPRECATED: Helper form element validator: number. |
| _field_extra_fields_pre_render | Pre-render callback to adjust weights and visibility of non-field elements. |
| _field_filter_items | Helper function to filter out empty field values. |
| _field_filter_xss_allowed_tags | List of tags allowed by field_filter_xss(). |
| _field_filter_xss_display_allowed_tags | Human-readable list of allowed tags, for display in help texts. |
| _field_sort_items | Helper function to sort items in a field according to user drag-n-drop reordering. |
| _field_sort_items_helper | Sort function for items order. (copied form element_sort(), which acts on #weight keys) |
| _field_sort_items_value_helper | Same as above, using ['_weight']['#value'] |