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# session_regenerate_id

(PHP 4 >= 4.3.2, PHP 5)

session_regenerate_id -- Update the current session id with a newly generated one

## 说明

bool session_regenerate_id ( [bool delete_old_session] )

session_regenerate_id() will replace the current session id with a new one, and keep the current session information.

## 参数

delete_old_session

  Whether to delete the old associated session file or not. Defaults to `FALSE`.

## 返回值

如果成功则返回 `TRUE`，失败则返回 `FALSE`。

## 更新日志

版本 | 说明
--- | ---
4.3.3 | Since then, if session cookies are enabled, use of session_regenerate_id() will also submit a new session cookie with the new session id.
5.1.0 | Added the delete_old_session parameter.

## 范例

例子 1. A session_regenerate_id() example

`<?php session_start(); $old_sessionid = session_id(); session_regenerate_id(); $new_sessionid = session_id(); echo "Old Session: $old_sessionid<br />"; echo "New Session: $new_sessionid<br />"; print_r($_SESSION); ?>`

## 参见

session_id()
session_start()
session_name()

后退 | 起点 | 前进
session_name | 上一级 | session_register