Record the user who created or edited a record in the backend

pdb-record-backend-user.php

<?php
add_action( 'pdb-after_submit_add', 'xnau_record_backend_user' );
add_action( 'pdb-after_submit_update', 'xnau_record_backend_user' );
/**
 * record the user who created or edited a record in the backend
 *
 * @param array $record the record data
 */
function xnau_record_backend_user( $record )
{
  $user_id_field = 'user_id'; // name of the PDB field where the user's ID is stored
  if ( is_admin() ) {
    global $wpdb, $current_user;
    $data = array( $user_id_field => $current_user->user_login ); // get the user's login name and place it in the ID field
    $wpdb->update( Participants_Db::$participants_table, $data, array( 'id' => $record['id'] ) );
  }
}