app/code/core/Mage/Adminhtml/Block/Catalog/Product/Edit/Tab/Ajax/Serializer.php

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<?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 license@magentocommerce.com 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_Adminhtml
 * @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)
 */

/**
 *
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Catalog_Product_Edit_Tab_Ajax_Serializer extends Mage_Core_Block_Template
{
    public function _construct()
    {
        parent::_construct();
        $this->setTemplate('catalog/product/edit/serializer.phtml');
        return $this;
    }

    public function getProductsJSON()
    {
        $result = array();
        if ($this->getProducts()) {
            $isEntityId = $this->getIsEntityId();
            foreach ($this->getProducts() as $product) {
                $id = $isEntityId ? $product->getEntityId() : $product->getId();
                $result[$id] = $product->toArray(array('qty', 'position'));
            }
        }
        return $result ? Zend_Json_Encoder::encode($result) : '{}';
    }
}

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