On a site I am working on, I am using Formidable forms and BuddyPress together. In the formidable forms, there is a field type user id that displays a list of all registered users in a dropdown. I would like to filter the list of users to only include the buddypress friends of the user filling the form. I thought I can use friends_get_friend_user_ids( bp_loggedin_user_id() ); to filter the list but I am not sure I am doing it correctly.

The code below works perfectly to filter the users in the dropdown to those who have the user role “author”. I need help to modify this to filter so that user friends are listed instead of authors.

add_filter('frm_setup_new_fields_vars', 'show_user_dropdown', 15, 2);
add_filter('frm_setup_edit_fields_vars', 'show_user_dropdown', 15, 3);
function show_user_dropdown($values, $field, $entry_id=false){
if( $field->id == 898 ){
$values['type'] = 'select';
$values['use_key'] = true;
$values['custom_html'] = FrmFieldsHelper::get_default_html('select');
$wp_user_search = new WP_User_Query( array( 'role' => 'author', 'fields' => array('user_login', 'ID') ) );
$authors = $wp_user_search->get_results();
$values['options'] = array();
foreach ($authors as $a) {
$values['options'][$a->ID] = $a->user_login; } }
return $values; }

The buddypress function that I should use for getting a list of friends of users I think is: friends_get_friend_user_ids( bp_loggedin_user_id() );

So I tried by modifying the about code in the following manner:

add_filter('frm_setup_new_fields_vars', 'show_user_dropdown', 15, 2);
add_filter('frm_setup_edit_fields_vars', 'show_user_dropdown', 15, 3);
function show_user_dropdown($values, $field, $entry_id=false){
if( $field->id == 173 ){
$values['type'] = 'select';
$values['use_key'] = true;
$values['custom_html'] = FrmFieldsHelper::get_default_html('select');
$friend_ids = friends_get_friend_user_ids(1);
$values['options'] = array();
foreach ($friend_ids as $a) {
$values['options'][$a->ID] = $a->ID; } }
return $values; }