clone.php.svn-base

来自「PHP 知识管理系统（基于树结构的知识管理系统）, 英文原版的PHP源码。」· SVN-BASE 代码 · 共 56 行

<?php
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2004 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 3.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/3_0.txt.                                  |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Aidan Lister <[e-mail]>                                |
// +----------------------------------------------------------------------+
//
// $Id$


/**
 * Replace clone()
 *
 * @category    PHP
 * @package     PHP_Compat
 * @link        http://php.net/language.oop5.cloning
 * @author      Aidan Lister <[e-mail]>
 * @version     $Revision$
 * @since       PHP 5.0.0
 * @require     PHP 4.0.0 (user_error)
 */
if (version_compare(phpversion(), '5.0') === -1) {
    // Needs to be wrapped in eval as clone is a keyword in PHP5
    eval('
        function clone($object)
        {
            // Sanity check
            if (!is_object($object)) {
                user_error(\'clone() __clone method called on non-object\', E_USER_WARNING);
                return;
            }
    
            // Use serialize/unserialize trick to deep copy the object
            $object = unserialize(serialize($object));

            // If there is a __clone method call it on the "new" class
            if (method_exists($object, \'__clone\')) {
                $object->__clone();
            }
            
            return $object;
        }
    ');
}

?>