app/code/core/Mage/Core/Helper/Url.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_Core
 * @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)
 */

/**
 * Core URL helper
 *
 * @category    Mage
 * @package     Mage_Core
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Core_Helper_Url extends Mage_Core_Helper_Abstract
{

    /**
     * Retrieve current url
     *
     * @return string
     */
    public function getCurrentUrl()
    {
        return $this->_getUrl('*/*/*', array('_current' => true, '_use_rewrite' => true));
    }

    /**
     * Retrieve current url in base64 encoding
     *
     * @return string
     */
    public function getCurrentBase64Url()
    {
        return $this->urlEncode($this->getCurrentUrl());
    }

    public function getEncodedUrl($url=null)
    {
        if (!$url) {
            $url = $this->getCurrentUrl();
        }
        return $this->urlEncode($url);
    }

    /**
     * Retrieve homepage url
     *
     * @return string
     */
    public function getHomeUrl()
    {
        return Mage::getBaseUrl();
    }

    protected function _prepareString($string)
    {
        $string = preg_replace('#[^0-9a-z]+#i', '-', $string);
        $string = strtolower($string);
        $string = trim($string, '-');

        return $string;
    }

}

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