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   1 /**
   2  * Implements hook_field_attach_form().
   3  */
   4 function {{ machine_name }}_field_attach_form($entity_type, $entity, &$form, &$form_state, $langcode) {
   5   // Add a checkbox allowing a given field to be emptied.
   6   // See hook_field_attach_submit() for the corresponding processing code.
   7   $form['empty_field_foo'] = array(
   8     '#type' => 'checkbox',
   9     '#title' => t("Empty the 'field_foo' field"),
  10   );
  11 }