Bug #71187 [Com]: session_regenerate_id(): Failed to create(read) session

Edit report at https://bugs.php.net/bug.php?id=71187&edit=1

 ID:                 71187
 Comment by:         coldfff at gmail dot com
 Reported by:        akauffman at ne4u dot com
 Summary:            session_regenerate_id(): Failed to create(read)
                     session
 Status:             Assigned
 Type:               Bug
 Package:            Session related
 Operating System:   Ubuntu 14.04 LTS
 PHP Version:        7.0.1
 Assigned To:        yohgaki
 Block user comment: N
 Private report:     N

 New Comment:

In case its any easier for testing, this bug is affecting me too using the Cache Savehandler from ZF2.

The workaround as suggested can also be applied there:
<?php

use Zend\Session\SaveHandler\Cache as ZendCache;

class Cache extends ZendCache
{
    public function read($id)
    {
        return (string) parent::read($id);
    }
}


Previous Comments:
------------------------------------------------------------------------
[2015-12-22 05:08:02] [email protected]

When I ported the save handler, I think I made sure it returns string always for successful cases. I'll have a look shortly.

@akauffman, could you give info where did you get the memeached module source code? Just making sure to get the same code.

------------------------------------------------------------------------
[2015-12-21 20:39:29] akauffman at ne4u dot com

Description:
------------
There seems to be a type casting problem with custom session handlers (specifically the memcached module) when session_regenerate_id() is called.  Perhaps related to a null return value.  It looks like it was introduced around 7RC3.

Error:
PHP message: PHP Catchable fatal error:  session_regenerate_id(): Failed to create(read) session ID: user

Test script:
---------------
Problem:
<?php
set_ini('session.save_handler','memcached');
set_ini('session.save_path','host1:11211');

session_start();
$_SESSION['value'] = session_id();
session_regenerate_id();
?>

Work around:
<?php
set_ini('session.save_handler','memcached');
set_ini('session.save_path','host1:11211');

class MemcachedSession extends SessionHandler
{
        public function read($session_id) {
                return (string)parent::read($session_id);
        }
}

$sess = new MemcachedSession();
session_set_save_handler($sess, true);

session_start();
$_SESSION['value'] = session_id();
session_regenerate_id();
?>

Expected result:
----------------
Shouldn't have to implement a workaround.



------------------------------------------------------------------------



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Edit this bug report at https://bugs.php.net/bug.php?id=71187&edit=1