Maikuolan

<?php
/**
 * "Undefined index" means that you're trying to fetch data from a variable
 * that doesn't exist (or isn't "defined"). Looking at your code here,
 * personally, what I would do here, firstly, is check whether your $_REQUEST
 * variables are empty, and if they're not, *then* set your $action variable,
 * rather than before.
 */
if (!empty($_REQUEST['action'])) {
    $action = $_REQUEST['action'];