In my zf3 model, I use the following way to operate my session stuff.
$sessionContainer = new Container(‘api’);
Now I need to get sessionid in my logic, if use the pure php, it will like:
$sessionId = session_id();
I wonder if there is a zf3-official way to get sessionid.
Thanks!
Do you create a zend-mvc based application?
yes! 
Here is the standard way of using zend-session within a zend-mvc-based application:
install zend-session per Composer
enable zend-session as module
config/modules.config.php:
return [
'Zend\Router',
'Zend\Session', // <-- Add this line
'Zend\Validator',
'Application',
];
config/autoload/global.config.php:
return [
// ...
'session_config' => [],
'session_storage' => [
'type' => Zend\Session\Storage\SessionArrayStorage::class,
],
];
The session-manager is set for all session-containers per default and the session itself is started in the constructor of a container.
module/Application/src/Controller/IndexController.php:
public function indexAction()
{
$container = new \Zend\Session\Container();
var_dump($container->getManager()->getId());
return new ViewModel();
}
module/Application/src/Controller/IndexController.php:
namespace Application\Controller;
use Zend\Mvc\Controller\AbstractActionController;
use Zend\Session\SessionManager;
use Zend\View\Model\ViewModel;
class IndexController extends AbstractActionController
{
/**
* @var SessionManager
*/
private $sessionManager;
public function __construct(SessionManager $sessionManager)
{
$this->sessionManager = $sessionManager;
}
// ...
}
module/Application/config/module.config.php:
return [
'controllers' => [
'factories' => [
Controller\IndexController::class => Zend\Mvc\Controller\LazyControllerAbstractFactory::class,
],
],
// ...
];
You have to start the session yourself!
module/Application/src/Controller/IndexController.php:
public function indexAction()
{
$this->sessionManager->start();
var_dump($this->sessionManager->getId());
return new ViewModel();
}
(The example is based on the zend-skeletion-application.)
The configuration is documented at: https://docs.zendframework.com/zend-session/config/
The session-manager is described at: https://docs.zendframework.com/zend-session/manager/
The containers her: https://docs.zendframework.com/zend-session/container/
And you can get the session-id also with PHP’s standard function session_id. Nothing else is done in the session-manager: https://github.com/zendframework/zend-session/blob/2cfd90e1a2f6b066b9f908599251d8f64f07021b/src/SessionManager.php#L309-L319
Hi Froschdesign, thank you so much!
$this->sessionManager->getId(); It is the right zf3 way solution!
I will use your way to improve my image drag auth plugin as I asked with topic how to get $container in static method. I saw you kindly answer me as well. thank you again.
Hi Froschdesign, sorry for bothering you again. I found I got a empty string when I call the getId() method.
The following is my code for your reference:
return [
'Zend\Paginator',
'Zend\Navigation',
'Zend\ServiceManager\Di',
'Zend\Session',
'Zend\Mvc\Plugin\Prg',
'Zend\Mvc\Plugin\Identity',
'Zend\Mvc\Plugin\FlashMessenger',
'Zend\Mvc\Plugin\FilePrg',
'Zend\Mvc\I18n',
'Zend\Mvc\Console',
'Zend\Log',
'Zend\Form',
'Zend\Cache',
'Zend\Db',
'Zend\Router',
'Zend\Validator',
'Application',
'Album',
'Blog',
'Admin',
'Api',
];
(before, I use exactly the same with the code you give as configuration. empty seession_id I got, so I changed to the following, still got an empty string via ->getId() method)
'session_config' => [
'remember_me_seconds' => 1800,
'name' => 'wendang',
'use_cookies' => true,
],
'session_storage' => [
'type' => SessionArrayStorage::class,
],
is this equal to the factories configuration in the module.config.php?
'controllers' => [
'abstract_factories' => [
LazyControllerAbstractFactory::class
],
],
class ImagedragauthController extends AbstractActionController
{
private $container;
private $sessionManager;
public function __construct(ServiceManager $container, SessionManager $sessionManager)
{
$this->container = $container;
$this->sessionManager = $sessionManager;
}
//****here I passed the $this->sessionManager to a model function as a param, and use this param in the model function as follow***//
}
public function validation($container, $sessionManager)
{
$sessionId = $sessionManager->getId();
var_dump($sessionId);exit; //output string(0) "" in the browser
}
output string(0) “” in the browser
Any idea? I thought I can get a long string. Pls tell me.
This is the normal behaviour of PHP’s session_id:
session_id() returns the session id for the current session or the empty string (“”) if there is no current session (no current session id exists).
http://php.net/manual/en/function.session-id.php#refsect1-function.session-id-returnvalues
You must the start a session:
$this->sessionManager->start();
var_dump($this->sessionManager->getId());
$this->sessionManager->getStorage()['foo'] = 'bar';
Then test it in another action:
$this->sessionManager->start();
var_dump($this->sessionManager->getStorage()->toArray());
Btw. do not inject the entire service-manager, only a single service!
@froschdesign
Thanks for your reply! it do helpful to me! It works.
But I have a question about the session container, I used to set seesion value via session container as:
public function generator()
{
$bgX = imagesx($this->backgroundImgSrc);
$bgY = imagesy($this->backgroundImgSrc);
$smX = imagesx($this->transparentImgSrc);
$smY = imagesy($this->transparentImgSrc);
$randX = rand(10,($bgX - $smX -5));
$randY = rand(5,($bgY - $smY - 5));
$sessionContainer = new Container('api'); // <--------------------------
$sessionContainer->{$this->sessionXname} = $randX; // <--------------------------
$sessionContainer->{$this->sessionYname} = $randY; // <--------------------------
return $randY;
}
In this way, I need to write the $this->sessionManager->start(); before?
It seems the programe works without ** $this->sessionManager->start();** first.
Or I just need to write ** $this->sessionManager->start();** ahead of $this->sessionManager->getId(), pls let me know, thank you!
As you mentioned:
Btw. do not inject the entire service-manager, only a single service!
I need to use the sm as follow, I just knew this way to use service manager inside a model:
public function validation($container, $sessionManager)
{
$sessionManager->start();
$threshold = 4;
$x = (int) $container->get('Request')->getQuery('x'); // <--------------------------
$y = (int) $container->get('Request')->getQuery('y'); // <--------------------------
$privateKey = (string) $container->get('Request')->getQuery('privateKey'); // <--------------------------
$type = (string) $container->get('Request')->getQuery('type');
$config = $container->get("config"); // <--------------------------
}
So my question is that: If not inject the sm as a entire service, what can I do in such situation? You can see I need to get the global config and query params from Request
If you use a session-container and the standard configuration, then the session-manager is set as default manager for session containers. The container start then the session on the manager for you.
See: https://github.com/zendframework/zend-session/blob/master/src/AbstractContainer.php#L83
No, you do not need the entire service-manager, only the request and config. (And I’m sure you do not need the entire configuration. 
)
No, I tried, if I wanna to get the session_id, it is no way to write $this->sessionManager->getId() after $sessonContainer = new Container(‘api’) , It must have a $this->sessionManager->start() before these! It is true, you can test in your demo.
I know it will be better to pass the request and config than to pass the entire service-manager. However in the developing process, I am not sure about the structure about the function validation at the beginning.
Besides, I know how to get the request in the controller action, like $this->getRequest()->getQuery(‘privateKey’), and then pass it to the model function I wanna use.
However, I really don’t know how to get the config in the controller action. So as you can see above that I use this way in my controller’s construction function, the magic method __construct like:
class ImagedragauthController extends AbstractActionController
{
private $container;
private $sessionManager;
public function __construct(ServiceManager $container, SessionManager $sessionManager)
{
$this->container = $container;
$this->sessionManager = $sessionManager;
}
//****here I passed the $this->sessionManager to a model function as a param, and use this param in the model function as follow***//
}
As to the config which set in global.php, I only know this way: get it from container. the service_locator in zf2, I used to do it this way. I don’t know any other way. Would you pls teach me a different one?
In fact, not only in the controller-action, but also the viewhelper, model, controller plugin etc.
In zf2, when you got the service-locator, you got everything. Inf zf3, it seems all the entrance is the controller’s __construct() function. To me, a beginning, if I can get the service which configured in the module.php freely, whenever and whereever I want. Hard to dream it, LOL
class Module implements ConfigProviderInterface
{
public function getConfig()
{
return include __DIR__ . '/../config/module.config.php';
}
public function getServiceConfig()
{
return [
'factories' => [ // <--- all the service defined here, how to get these freely in anywhere, action, model, service, entity, viewhelper, etc
Model\ApiModel::class => function($container){
return new Model\ApiModel($container);
},
],
];
}
}If you want to use containers, then you do not need the session-manager:
$container = new Zend\Session\Container();
var_dump($container->getManager()->getId());
It works, because with the default configuration the session-manager are added to all session-containers:
no!!!
I used like this, but failed again!!! crazy.
$sessionContainer = new Container('api');
$sessionId = $sessionContainer->getManager()->getId(); // <--- empty again!!
I guess there are something wrong with my session configuration in the global.php, Pls teach me:
'session_config' => [
'remember_me_seconds' => 1800,
'name' => 'wendang',
'use_cookies' => true,
],
'session_storage' => [
'type' => SessionArrayStorage::class,
],
I deleted all the inject about the session manager already, my application crashed.
Please create a new application and then test it there. The skeleton application helps here: The Skeleton Application - Tutorials - Zend Framework Docs
No problem here.
Sorry, I can’t see your errors…
Sorry, My fault, it runs okay!! I test it again! Before I judged it via the phenomenon not debug the code really. Sorry for that.
Thank you so much!
No problem.
I have also updated my introduction above. (Note to me: add the example to the documentation)
No problem.
I have also updated my introduction above. (Note to me: add the example to the documentation)
I don’t understand Note to me: add the example to the documentation
Should I paste the full code here? I don’t know how to do so[files locate in different folder], If you need to see the full code, I can send a copy to you. I run a demo for it demo page
It means that it is now my job to add the introduction with code example to the documentation. 
Oh no, everyone can contribute to the Zend Framework and also to the documentation. I am a member of the documentation team, but that does not mean that I have to write or can write the entire documentation.
The zend-session documentation is missing the description of how it can be used in an application. Therefore it is difficult for you to find the right way. I hope I can fix that in the near future.