Add user dropdown in formidableforms

wp-frm-populate-user-dropdown.php

// call it in your theme or plugin function file.
wp_frm_populate_user_dropdown( 485, 'subscriber' ); // you can change field_id & role as per your need.


function wp_frm_populate_user_dropdown($field_id, $role = 'subscriber') {
	$user_info = array ( 'field_id' => $field_id, 'role' => $role );
	add_filter('frm_setup_new_fields_vars', function ( $values, $field ) use ($user_info) {
		
	    $values = frm_populate_user_dropdown($values, $field, $user_info);
	    return $values;

	}, 20, 2);
	add_filter('frm_setup_edit_fields_vars', function ( $values, $field ) use ($user_info) {
		
	    $values = frm_populate_user_dropdown($values, $field, $user_info);
	    return $values;

	}, 20, 2);
}



function frm_populate_user_dropdown($values, $field, $user_info) {
	/**
	 * Detect plugin. For use on Front End only.
	 */
	include_once( ABSPATH . 'wp-admin/includes/plugin.php' );
  
	if ( $field->id == $user_info['field_id'] ) {
	   $role = $user_info['role'];
	   $users = get_users( array( 'role' => $role ) );
	   $values['options'] = array( );
	   foreach ( $users as $user ) {
	     $values['options'][] = array(
	       'label' => $user->display_name,
	       'value' => $user->ID
	     );
	   }
	}
  
	return $values;
	
}