function guts()
 {
     if (isset($_GET['go'])) {
         header(sprintf('Content-Disposition: attachment;filename="vaf-export-%s.csv"', time()));
         header('Content-Type: text/csv');
         $exporter = new VF_Tire_Catalog_TireProduct_Export($_FILES['file']['tmp_name']);
         echo $exporter->export();
         exit;
     }
 }
<?php

/**
 * Vehicle Fits
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to sales@vehiclefits.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Vehicle Fits to newer
 * versions in the future. If you wish to customize Vehicle Fits for your
 * needs please refer to http://www.vehiclefits.com for more information.
 * @copyright  Copyright (c) 2013 Vehicle Fits, llc
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */
require_once 'config.php';
// DO NOT EDIT BELOW HERE
$db = Zend_Db::factory('pdo_mysql', $params);
$db->getConnection();
Zend_Registry::set('db', $db);
$file = 'product-tire-sizes-export.csv';
$exporter = new VF_Tire_Catalog_TireProduct_Export();
file_put_contents($file, $exporter->export());