关闭会话并开始新的会话

Question

我正在测试PHP会话中安全检查的实现.我可以成功检测会话是否从另一个IP地址启动,我可以成功启动一个新会话.但是,来自旧会话的数据会被复制到新会话中!如何在为其合法所有者保留以前的会话数据的同时启动空白会话？

在经过多次尝试失败之后,这是我的代码:

<?php

// Security check
if( isset($_SESSION['ip_address']) && $_SERVER['REMOTE_ADDR']!=$_SESSION['ip_address'] ){
    // Check failed: we'll start a brand new session
    session_regenerate_id(FALSE);
    $tmp = session_id();
    session_write_close();
    unset($_SESSION);
    session_id($tmp);
    session_start();
}

// First time here
if( !isset($_SESSION['ip_address']) ){
    $_SESSION['ip_address'] = $_SERVER['REMOTE_ADDR'];
    $_SESSION['start_date'] = new DateTime;
}

关于会话的官方文档非常令人困惑:(

更新:我发布了一些经过反复试验的调查结果.他们似乎工作:

<?php

// Load the session that we will eventually discard
session_start();

// We can only generate a new ID from an open session
session_regenerate_id();

// We store the ID because it gets lost when closing the session
$tmp = session_id();

// Close session (doesn't destroy data: $_SESSION and file remains)
session_destroy();

// Set new ID for the next session
session_id($tmp);
unset($tmp);

// Start session (uses new ID, removes values from $_SESSION and loads the new ones if applicable)
session_start();

Answer 1

只需拨打session_unset后session_regenerate_id重置$_SESSION当前会话:

if (isset($_SESSION['ip_address']) && $_SERVER['REMOTE_ADDR']!=$_SESSION['ip_address']) {
    // Check failed: we'll start a brand new session
    session_regenerate_id(FALSE);
    session_unset();
}