CakePHP 2.6，Redis会话/缓存在重定向时被破坏

Question

I'm in the process of upgrading our project from Centos-6/Apache 2.0/PHP5.3/Cake 2.0/File Cache (6/3/2/0/F) to Centos-7/Apache 2.4/PHP5.6/Cake 2.6/Redis Cache & Session (7/6/4/6/R).

The upgrade works great and as intended if I leave the 7/6/4/6/R with File Caching and php sessions. But I've installed Redis following a few tutorials and everything works as intended from PHP 5.6 recognizing Redis, CakePHP gets 18 for 18 tests passes in test.php, yet the Redis Sessions are being destroyed on Redirects.

Core.php

//Replaces standard
Configure::write('Session', array(
'defaults' => 'cache',
'timeout' => '100',
'start' => true,
'checkAgent' => false,
'handler' => array(
'config' => 'session'
)
));
//Engine
$engine = 'Redis';

//Bottom of Core
 Cache::config ('session', array (
'Engine' => $engine,
'Prefix' => $prefix . 'cake_session_',
'Duration' => $duration
));

Bootstrap.php

Cache::config('default', array('engine' => 'Redis'));

AppController.php

public $components = array(
    'Session',
    'Auth' => array(
        'loginRedirect'=>array('controller' => 'companies', 'action' => 'view'),
        'logoutRedirect'=>array('controller' => 'users', 'action' => 'login'),
        'loginAction'=>array('controller' => 'users', 'action' => 'login'),
        'authenticate' => array(
            'Form' => array(
                'userModel' => 'User',
                'fields' => array('username' => 'email', 'password' => 'password')
            )
        )
    ));

UsersController.php - Login Function - C&P'd from Blog example

    if ($this->request->is('post')) {

    if ($this->Auth->login()) {
        //print_r($_SESSION);die();
        return $this->redirect($this->Auth->redirectUrl());
    }
    $this->Session->setFlash(__('Invalid username or password, try again'));
}

Will print the intended and entire Session Array key=>values. PERFECT!!! Now If I let the redirect through.

CompaniesController.php

public function view($id = null) {
        print_r($_SESSION);
}

Contains no key=>values.

Answer 1

There are two extra item to check. After these were modified Redis worked perfectly with Cake 2.6.4.

1) Re-verify your phpinfo() and make sure there is no local session variables blocking the Global php.ini settings. Mine were coming from httpd's php.conf.

2) session_start() does need to be added, even though CakePHP Documentation states you don't have to use this command if the loaded component of Session or Auth is used. i placed the command on line one of webroot.

Answer 2

You need to call session_write_close before redirect as internally session_write_close called on __destroy.

But this event happens after you have sent "Location: " header.

Try this in AppController:

public function redirect($url, $status = null, $exit = true) {
    if ($exit && $this->Components->enabled('Session') && $this->Session->started()) {
        session_write_close();
    }
    return parent::redirect($url, $status, $exit);
}

Same problem still in Cake3. In symfony2 it's fixed — before redirect session component closes itself.