hook_field_formatter_settings_form
function hook_field_formatter_settings_form
hook_field_formatter_settings_form($field, $instance, $view_mode, $form, &$form_state)
Specify the form elements for a formatter's settings.
This hook is only invoked if hook_field_formatter_settings_summary() returns a non-empty value.
Parameters
$field: The field structure being configured.
$instance: The instance structure being configured.
$view_mode: The view mode being configured.
$form: The (entire) configuration form array, which will usually have no use here.
$form_state: The form state of the (entire) configuration for