clone.php

<?php
/**
 * Magento
 *
 * 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 [email protected] so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

error_reporting(E_ALL | E_STRICT);
define('MAGENTO_ROOT', getcwd());
$mageFilename = MAGENTO_ROOT . '/app/Mage.php';
require_once $mageFilename;
Mage::setIsDeveloperMode(true);//just so you see the errors if any
Mage::app();//instantiate the application
$category1Id = 1;
$category2Id = 2;
$category5Id = 5;
//get the category instances
$category1 = Mage::getModel('catalog/category')->load($category1Id);
$category2 = Mage::getModel('catalog/category')->load($category2Id);
$category5 = Mage::getModel('catalog/category')->load($category5Id);

//get products from the first 2 categories
$category1Products = $category1->getProductsPosition();
$category2Products = $category2->getProductsPosition();
//merge the products into one big array
$merged = array_merge($category1Products, $category2Products);
//assigned the merged products to category 5.

$category5->setPostedProducts($merged);
//save the category 5;
$category5->save();

?>