session_regenerate_id

(PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)

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

Description

session_regenerate_id(bool $delete_old_session = false): bool

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

When session.use_trans_sid is enabled, output must be started after session_regenerate_id() call. Otherwise, old session ID is used.

Warning

Currently, session_regenerate_id does not handle an unstable network well, e.g. Mobile and WiFi network. Therefore, you may experience a lost session by calling session_regenerate_id.

You should not destroy old session data immediately, but should use destroy time-stamp and control access to old session ID. Otherwise, concurrent access to page may result in inconsistent state, or you may have lost session, or it may cause client(browser) side race condition and may create many session ID needlessly. Immediate session data deletion disables session hijack attack detection and prevention also.

Parameters

delete_old_session: Whether to delete the old associated session file or not. You should not delete old session if you need to avoid races caused by deletion or detect/avoid session hijack attacks.

Return Values

Returns true on success or false on failure.

Examples

Example #1 A session_regenerate_id() example

<?php
// NOTE: This code is not fully working code, but an example!

session_start();

// Check destroyed time-stamp
if (isset($_SESSION['destroyed'])
    && $_SESSION['destroyed'] < time() - 300) {
    // Should not happen usually. This could be attack or due to unstable network.
    // Remove all authentication status of this users session.
    remove_all_authentication_flag_from_active_sessions($_SESSION['userid']);
    throw(new DestroyedSessionAccessException);
}

$old_sessionid = session_id();

// Set destroyed timestamp
$_SESSION['destroyed'] = time(); // session_regenerate_id() saves old session data

// Simply calling session_regenerate_id() may result in lost session, etc.
// See next example.
session_regenerate_id();

// New session does not need destroyed timestamp
unset($_SESSION['destroyed']);

$new_sessionid = session_id();

echo "Old Session: $old_sessionid<br />";
echo "New Session: $new_sessionid<br />";

print_r($_SESSION);
?>

Current session module does not handle unstable network well. You should manage session ID to avoid lost session by session_regenerate_id.

Example #2 Avoiding lost session by session_regenerate_id()

<?php
// NOTE: This code is not fully working code, but an example!
// my_session_start() and my_session_regenerate_id() avoid lost sessions by
// unstable network. In addition, this code may prevent exploiting stolen
// session by attackers.

function my_session_start() {
    session_start();
    if (isset($_SESSION['destroyed'])) {
       if ($_SESSION['destroyed'] < time()-300) {
           // Should not happen usually. This could be attack or due to unstable network.
           // Remove all authentication status of this users session.
           remove_all_authentication_flag_from_active_sessions($_SESSION['userid']);
           throw(new DestroyedSessionAccessException);
       }
       if (isset($_SESSION['new_session_id'])) {
           // Not fully expired yet. Could be lost cookie by unstable network.
           // Try again to set proper session ID cookie.
           // NOTE: Do not try to set session ID again if you would like to remove
           // authentication flag.
           session_commit();
           session_id($_SESSION['new_session_id']);
           // New session ID should exist
           session_start();
           return;
       }
   }
}

function my_session_regenerate_id() {
    // New session ID is required to set proper session ID
    // when session ID is not set due to unstable network.
    $new_session_id = session_create_id();
    $_SESSION['new_session_id'] = $new_session_id;
    
    // Set destroy timestamp
    $_SESSION['destroyed'] = time();
    
    // Write and close current session;
    session_commit();

    // Start session with new session ID
    session_id($new_session_id);
    ini_set('session.use_strict_mode', 0);
    session_start();
    ini_set('session.use_strict_mode', 1);
    
    // New session does not need them
    unset($_SESSION['destroyed']);
    unset($_SESSION['new_session_id']);
}
?>

User Contributed Notes 26 notes

down

tedivm at tedivm dot com ¶

8 years ago


I wrote the current top voted comment on this and wanted to add something. The existing code from my previous comment generates it's nonces in an insecure way-

<?php
$_SESSION['nonce'] = md5(microtime(true));
?>

Since "microtime" is predictable it makes brute forcing the nonce much easier. A better option would be something that utilizes randomness, such as-

<?php
bin2hex(openssl_random_pseudo_bytes(32))
?>

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tedivm at tedivm dot com ¶

15 years ago


I wrote the following code for a project I'm working on- it attempts to resolve the regenerate issue, as well as deal with a couple of other session related things.

I tried to make it a little more generic and usable (for instance, in the full version it throws different types of exceptions for the different types of session issues), so hopefully someone might find it useful.

<?php
function regenerateSession($reload = false)
{
    // This token is used by forms to prevent cross site forgery attempts
    if(!isset($_SESSION['nonce']) || $reload)
        $_SESSION['nonce'] = md5(microtime(true));

    if(!isset($_SESSION['IPaddress']) || $reload)
        $_SESSION['IPaddress'] = $_SERVER['REMOTE_ADDR'];

    if(!isset($_SESSION['userAgent']) || $reload)
        $_SESSION['userAgent'] = $_SERVER['HTTP_USER_AGENT'];

    //$_SESSION['user_id'] = $this->user->getId();

    // Set current session to expire in 1 minute
    $_SESSION['OBSOLETE'] = true;
    $_SESSION['EXPIRES'] = time() + 60;

    // Create new session without destroying the old one
    session_regenerate_id(false);

    // Grab current session ID and close both sessions to allow other scripts to use them
    $newSession = session_id();
    session_write_close();

    // Set session ID to the new one, and start it back up again
    session_id($newSession);
    session_start();

    // Don't want this one to expire
    unset($_SESSION['OBSOLETE']);
    unset($_SESSION['EXPIRES']);
}

function checkSession()
{
    try{
        if($_SESSION['OBSOLETE'] && ($_SESSION['EXPIRES'] < time()))
            throw new Exception('Attempt to use expired session.');

        if(!is_numeric($_SESSION['user_id']))
            throw new Exception('No session started.');

        if($_SESSION['IPaddress'] != $_SERVER['REMOTE_ADDR'])
            throw new Exception('IP Address mixmatch (possible session hijacking attempt).');

        if($_SESSION['userAgent'] != $_SERVER['HTTP_USER_AGENT'])
            throw new Exception('Useragent mixmatch (possible session hijacking attempt).');

        if(!$this->loadUser($_SESSION['user_id']))
            throw new Exception('Attempted to log in user that does not exist with ID: ' . $_SESSION['user_id']);

        if(!$_SESSION['OBSOLETE'] && mt_rand(1, 100) == 1)
        {
            $this->regenerateSession();
        }

        return true;

    }catch(Exception $e){
        return false;
    }
}

?>

down

ei dot rik dot ops dot tad at gmail dot com ¶

8 years ago


In PHP 5.6 (and probably older versions), session_regenerate_id(true) do not trigger a read() call to the session handler for the new session id. 

In PHP 7, read() is triggered during session_regenerate_id(true). Nice to know when working with custom session handlers.

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gr at gr5 dot org ¶

13 years ago


If you are trying to maintain 2 active sessions don't use session_regenerate_id().  Especially if the first session is closed and it's time to open the second.  Because the session id is cached you also have to explicitly set it the second time.

<?php
session_name('PHPSESSID'); // redundant - here for clarity
session_start();
// ...do stuff
session_write_close();

// now switch to session 2...
session_name('PHPSESSID_2');
if (isset($_COOKIE['phpsessid_2']))
    session_id($_COOKIE['phpsessid_2']); // not doing this will simply reopen the first session again
else
    session_id(sha1(mt_rand()); // dont use session_regenerate_id() here.  Not creating a new id will create two cookies with same session id and same session variables
session_start();
// ... do stuff with session 2
session_write_close();
?>

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ross at kndr dot org ¶

20 years ago


In a previous note, php at 5mm de describes how to prevent session hijacking by
ensuring that the session id provided matches the HTTP_USER_AGENT and REMOTE_ADDR fields that were present when the session id was first issued.  It should be noted that HTTP_USER_AGENT is supplied by the client, and so can be easily modified by a malicious user.  Also, the client IP addresses can be spoofed, although that's a bit more difficult.  Care should be taken when relying on the session for authentication.

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spmtrap at yahoo dot com ¶

12 years ago


`session_regenerate_id` sends a new cookie but doesn't overwrite the value stored in `$_COOKIE`. After calling `session_destroy`, the open session ID is discarded, so simply restarting the session with `session_start` (as done in Ben Johnson's code) will re-open the original, though now empty, session for the current request (subsequent requests will use the new session ID). Instead of `session_destroy`+`session_start`, use the `$delete_old_session` parameter to `session_regenerate_id` to delete the previous session data.

<?php
session_start();
/* Create a new session, deleting the previous session data. */
session_regenerate_id(TRUE);
/* erase data carried over from previous session */
$_SESSION=array();
?>

To start a new session and leave the old untouched, simply leave out the argument to `session_regenerate_id`.

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babel at nosqamplease sympatico ca ¶

20 years ago


To add to php at 5mm de's comments:

If the session is held over https, it's even better to save the client's cert or ssl session id instead of the hostname or ip, as it's proxy-transparent and more secure.

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php at cny dot de ¶

20 years ago


Also note that REMOTE_ADDR may change on every request if the user comes through a proxy farm. Most AOL-users do.

down

k-gun !! mail ¶

7 years ago


Document example is wrong with usage of "session.use_strict_mode" according to RFC (says: "warning error for session_id() when use_strice_mode=1" on https://wiki.php.net/rfc/strict_sessions). 

So, this directive affects "session_id()" not "session_start()". So usage must be like this;

<?php
// first set ini
ini_set('session.use_strict_mode', '0');
// and 
session_id($sid);

// then 
// maybe run this: ini_restore('session.use_strict_mode');

// then go on...
?>

Refs (ctrl+f & use_strict_mode);
https://wiki.php.net/rfc/strict_sessions
https://wiki.php.net/rfc/session-create-id
http://php.net/manual/en/function.session-id.php#119997

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madsen at sjovedyr.dk ¶

21 years ago


I had problems with a proxy changing a visitors session_id-cookie, so he'd get a LOT of errors when visiting my site.
I handled the bogus session-id's like this. (Note: It only works in versions > 4.3.2.)

<?php
// Start a session and suppress error-messages.
@session_start();

// Catch bogus session-id's.
if (!preg_match("/^[0-9a-z]*$/i", session_id())) {

    // Output a warning about the messed up session-id.
    $error->handleError("WARN", "Your session id is messed up, you might not be able to use some features on this site.");

    // Generate a fresh session-id.
    session_regenerate_id();
}

// Site contents.
?>

Hope someone can use it.

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Nicolas dot Chachereau at Infomaniak dot ch ¶

19 years ago


Session_destroy() does not only destroy the data associated with the current session_id (i.e. the file if you use the default session save handler), but also the session itself: if you call session_destroy() and then session_regenerate_id(), it will return false, and session_id() won't return anything. In order to manipulate a session after destroying it, you need to restart it.

So in fact, the code mentionned by chris won't work. If you want to destroy the file associated with the old session_id, try the following:
<?php
session_start();
$old_sessid = session_id();
session_regenerate_id();
$new_sessid = session_id();
session_id($old_sessid);
session_destroy();

//If you don't copy the $_SESSION array, you won't be able to use the data associated with the old session id.
$old_session = $_SESSION;
session_id($new_sessid);
session_start();
$_SESSION = $old_session;
//...
?>

Note: this technique will send 3 Set-Cookie headers (one on each session_start() and one on session_regenerate_id()). I don't think this is a problem, but if it appears to be one, you could either leave it alone and wait for the garbage collector to catch the file associated with the old session, or try to delete the file with unlink().

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Rumour ¶

11 months ago


The code example provided of my_session_regenerate_id() DOES NOT work and DESTROYS all session variables. Plus the second ini_set gives an error.

The code for regenerating (only that part, the rest seems fine) should simply be this:

<?php
function my_session_regenerate_id() {
    $new_session_id = session_create_id();

    // backup session variables
    $keepSession = $_SESSION ;

    // add info for users with bad connection not receiving the new session id
    $_SESSION['new_session_id'] = $new_session_id;        
    // Set destroy timestamp
    $_SESSION['destroyed'] = time();
    
    // Write and close current session;
    session_commit() ;

    // Start session with new session ID     
    ini_set('session.use_strict_mode', 0);
    session_id($new_session_id);
    session_start();
    $_SESSION = $keepSession ;
}
?>

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soapergem at gmail dot com ¶

16 years ago


This can be a very dangerous function if you're not careful about how you handle things, because even though it generates a whole new set of session data, it keeps the old data "open" until the script terminates, locking out any other scripts trying to run concurrently with the old session id.

Recently I came across a situation where I wanted to explicitly pass in a session ID, copy the data from that session into a *new* session, and then continue operating under that new session, thereby allowing other scripts to use the old one concurrently. But I quickly found that these "other scripts" would not execute until the first script finished--even though it had already started a new session--because it kept the old session open.

So if you're trying to copy over session data to a new session to free up the old session for continued, concurrent use, here's some code to ensure nobody's feet get stepped on:

<?php

//  get session id of an existing session
$sid = $_GET['sid'];

//  start the old session to retrieve $_SESSION data
session_id($sid);
session_start();

//  start a new session; this copies the $_SESSION data over
session_regenerate_id();

//  hang on to the new session id
$sid = session_id();

//  close the old and new sessions
session_write_close();

//  re-open the new session
session_id($sid);
session_start();

/* main code here */

?>

This could probably be encapsulated into a function with one parameter as well to save space if it was a repeated thing.

down

primenetworkzx at gmail dot com ¶

16 years ago


If you are storing your session data in a database you have to manually update the session_id in the database. The session_set_save_handler() will not do it for you.

function UpdateSessID() {
    $old_sess_id = session_id();
    session_regenerate_id(false);
    $new_sess_id = session_id();
        
    $query = "UPDATE `session_table` SET `session_id` = '$new_sess_id' WHERE session_id = '$old_sess_id'";
        mysql_query($query);
}

Be sure to set session_regenerate_id() to FALSE since it's not really necessary to delete the whole record from MySQL and add it again. That's unnecessary overhead. Only changing the id matters.

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dyer85 at gmail dot com ¶

19 years ago


There could be a potential problem with elger at NOSPAM dot yellowbee dot nl's a few posts below. In the code, was used the REQUEST_URI server variable, which, in some cases might already contain the query string. Therefore, always apending '?whatever=foo' would occasionally cause the script to malfunction. I suggest using PHP_SELF, which will not contain the query string after the file.

down

-2

mikebranttx at gmail dot com ¶

7 years ago


Note that in current PHP 7.2 nightly builds example #2 above will not work as shown.  You will get following error upon trying to turn strict mode back on after session_start():

"ini_set(): A session is active. You cannot change the session module's ini settings at this time"

I suppose this means that for any session where you perform session ID regeneration or session ID forwarding (from a session for which a recent session ID regeneration was performed to the new session ID). That you will just have to live with strict mode being disabled for the remainder of that active session.

I don't know that this is really a security concern so long as you are following a single-session per request design (i.e. you are not working with multiple concurrent sessions).

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-2

chris at knowledge dot tee-vee ¶

19 years ago


licp - no, session_regenerate_id() does not destroy any saved session data.

elger, I prefer the following order

[code]
// populate $_SESSION with any previously saved session data for the current session_id
session_start();  
...
// delete any saved data associated with current session_id, $_SESSION is not changed
session_destroy(); 

// change session_id, $_SESSION not altered
session_regenerate_id(); 
...
// save any $_SESSION data under the current session_id
session_close(); 
[/code]

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-1

antomsa at hotmail dot it ¶

3 years ago


<?php 

function my_session_regenerate_id() {
    ...
    session_start();
    ...
    
    unset($_SESSION['destroyed']);
    unset($_SESSION['new_session_id']);
}

?>

Within my_session_regenerate_id(), unset($_SESSION['destroyed']) and 
 unset($_SESSION['new_session_id']) are useless because session_start() will open an empty session. They would be needed if built-in session_regenerate_id() was called.

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-4

kgm_india at yahoo dot co dot in ¶

11 years ago


as far as I have understood reading this online notes,

session_name() is the name which is identified as session a through the cookies or http links.

session_id is  like a transaction within a session_name() and one session_name may have many session_id

each session_id has the corresponding data stored.

session_id are used in read and write callback under a session_name

whatever it is, first call the
 session_name(),  
then call session_id ()
and then call start_session()

start_session will open the session_name, then check the session_id called before and use it in the read or write call back for storing or retrieving data

calling start_session() without session_name or session_id will use the default session_name and the default session_id in that order

I hope if the order is followed there should not be any problems.

do not call session_name or session_id after start_session(), if you are specific on using them.

thank you for others note.

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-6

elger at NOSPAM dot yellowbee dot nl ¶

20 years ago


Take good notice of the new cookie being sent on calling session_regenerate_id on cookie-enabled sessions. 
Make sure your page is reloaded otherwise you'll get an "session_destroy(): Session object destruction failed" error. So here are the examples:

Wrong:
<?php
    session_start();
    session_regenerate_id();
    session_destroy();
?>

Correct-like:
<?php
if (!$_GET['mode']){
    session_start();
    session_regenerate_id();
    header('location: '.$_SERVER['REQUEST_URI'].'?mode=destroy');
} else {
    session_start();
    session_destroy();
}
?>

I noted this because googleing on the previous mentioned error leads to all kinds of bug reports, but not to the solution. (which is, of course, to read the manual)

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-5

raido dot aasoja at gmail dot com ¶

14 years ago


A note on lost sessions and trying to fix it with session_regenerate_id:
Make sure that you're not trying to push SimpleXML object to the session. It just won't go without first converting it to array. :)

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-3

sopel ¶

19 years ago


for php 5.1> user probably worth visiting is http://ilia.ws/archives/47-session_regenerate_id-Improvement.html

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-6

licp at hotmail dot com ¶

19 years ago


By inspecting the source code, I am not sure that after session_regenerate_id() run, the original session data does not destroy (still keeps at the system) that sniffers still hijack by applying original session identifier.

In addition, I find that if user-level session storage handler is used. session_regenerate_id() does not work.

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-6

php at 5mm de ¶

21 years ago


This feature seems to create a new session ID without clearing the old session data. This is a very important feature for security validation:

$usedns = TRUE; // for eliminating failture by proxys using IP chains, but slower

$useragent = getenv("HTTP_USER_AGENT");
$host = getenv("REMOTE_ADDR");
$dns = $global['dns'] ? @gethostbyaddr($host):$host;

session_start();

if(session_is_registered('securitycheck')) {
    if(
            (($_SESSION['session']['host'] != $this->host) && !$usedns)
         || ($_SESSION['session']['dns'] != $this->dns)
         || ($_SESSION['session']['useragent'] != $this->useragent)
    ) {
        session_regenerate_id();
        session_unset();
    }
} else {
    $currentdata = array();
    $currentdata['host'] = $this->host;
    $currentdata['dns'] = $this->dns;
    $currentdata['useragent'] = $this->useragent;
    
    session_register('securitycheck', $currentdata);
}

If sombody steals an active SID (e.g. by referrer or injection attack), he can?t be validated because of either the host / dns or useragent and will get a new (empty) SID, without interrupting the original session.

Please mail me for any comments: php at 5mm de

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-14

Ben Johnson ¶

14 years ago


To "start a new session", try the following:

<?php
session_start();
session_regenerate_id();
session_destroy();
unset($_SESSION);
session_start();
?>

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-4

Alamin ¶

6 years ago


In the second example provided by php.net, should it call my_session_start inside the session regenerate method instead of directly calling session_start? I think it is an error.

add a note

session_regenerate_id

Description

Parameters

Return Values

Examples

See Also

User Contributed Notes 26 notes