ThinkPHP/Extend/Vendor/Zend/Loader/Autoloader.php

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<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * 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@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Loader
 * @subpackage Autoloader
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @version    $Id: Autoloader.php 2504 2011-12-28 07:35:29Z liu21st $
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */

/** Zend_Loader */
require_once 'Zend/Loader.php';

/**
 * Autoloader stack and namespace autoloader
 * 
 * @uses       Zend_Loader_Autoloader
 * @package    Zend_Loader
 * @subpackage Autoloader
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Loader_Autoloader
{
    /**
     * @var Zend_Loader_Autoloader Singleton instance
     */
    protected static $_instance;

    /**
     * @var array Concrete autoloader callback implementations
     */
    protected $_autoloaders = array();

    /**
     * @var array Default autoloader callback
     */
    protected $_defaultAutoloader = array('Zend_Loader', 'loadClass');

    /**
     * @var bool Whether or not to act as a fallback autoloader
     */
    protected $_fallbackAutoloader = false;

    /**
     * @var array Callback for internal autoloader implementation
     */
    protected $_internalAutoloader;