app/code/core/Mage/Page/Block/Html/Breadcrumbs.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_Page
 * @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)
 */

/**
 * Html page block
 *
 * @category   Mage
 * @package    Mage_Page
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Page_Block_Html_Breadcrumbs extends Mage_Core_Block_Template
{
    /**
     * Array of breadcrumbs
     *
     * array(
     *  [$index] => array(
     *                  ['label']
     *                  ['title']
     *                  ['link']
     *                  ['first']
     *                  ['last']
     *              )
     * )
     *
     * @var array
     */
    protected $_crumbs = null;

    function __construct()
    {
        parent::__construct();
        $this->setTemplate('page/html/breadcrumbs.phtml');
    }

    function addCrumb($crumbName, $crumbInfo, $after = false)
    {
        $this->_prepareArray($crumbInfo, array('label', 'title', 'link', 'first', 'last', 'readonly'));
        if ((!isset($this->_crumbs[$crumbName])) || (!$this->_crumbs[$crumbName]['readonly'])) {
           $this->_crumbs[$crumbName] = $crumbInfo;
        }
        return $this;
    }

    protected function _toHtml()
    {
        if (is_array($this->_crumbs)) {
            reset($this->_crumbs);
            $this->_crumbs[key($this->_crumbs)]['first'] = true;
            end($this->_crumbs);
            $this->_crumbs[key($this->_crumbs)]['last'] = true;
        }
        $this->assign('crumbs', $this->_crumbs);
        return parent::_toHtml();
    }
}

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