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Block Source: Mage_Page_Block_Html_Breadcrumbs

<?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@magento.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.magento.com for more information.
 *
 * @category    Mage
 * @package     Mage_Page
 * @copyright  Copyright (c) 2006-2015 X.commerce, Inc. (http://www.magento.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;

    
/**
     * Cache key info
     *
     * @var null|array
     */
    
protected $_cacheKeyInfo null;

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

    public 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;
    }

    
/**
     * Get cache key informative items
     *
     * @return array
     */
    
public function getCacheKeyInfo()
    {
        if (
null === $this->_cacheKeyInfo) {
            
$this->_cacheKeyInfo parent::getCacheKeyInfo() + array(
                
'crumbs' => base64_encode(serialize($this->_crumbs)),
                
'name'   => $this->getNameInLayout(),
            );
        }

        return 
$this->_cacheKeyInfo;
    }


    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();
    }
}