Form Callback Function

callback.php

<?php
/**
 * Example callback function for filling <select> fields
 * 
 * @retuen array
 **/
function my_callback_function() {
  return array(
    array("key"=> "1", "value"=>"One", "description"=>"One"),
    array("key"=> "2", "value"=>"Two", "description"=>"Two"),
  );
}