How to Use Session in Symfony using Custom Twig Extension

Question

what i need

i just want to implement session in symfony.

here is what i tried

/src/Acme/bundlename/Twig

Acmeextension.php

public function getFunctions()
{
  return array(
'count'  => new \Twig_Function_Method($this, 'count'),
 );
 }   

public function count()
{
    session_start();
    if(isset($_SESSION["count"]))
    {
        $accesses = $_SESSION["count"] + 1;
    }
    else
    {
        $accesses = 1;
    }
    $_SESSION["count"] = $accesses;
    return $accesses;
}

here is the code of twig:

function callback()
{
    var page = {{ count}};
    if (page >4)
    {
        alert("limit exceeded");            
    }
    else
    {
      alert("ok");                 
    }
}
callback();

calling in twig 
{{ count }}

i just want calculate pageviews.
i used script in twig so that i if there is page view are more then 4 then show alert message.
i have used symfony custom functions so that $SESSION in symfony.
i have implemented this code in core Php its working fine.
i have refer the link Passing Session to TWIG template.
custom Twig Extension http://symfony.com/doc/current/cookbook/templating/twig_extension.html

Problem

im not Gettig any alert in when i reload the page.
please tell me where im wrong , any suggestion are most welcome.

i have try debug code but still alert not working {% block myJavascript %} <script type="text/javascript"> alert("test"); </script> {% endblock %} — user2818060
– user2818060, Commented Sep 17, 2014 at 11:20

Matthew A Thomas · Accepted Answer · 2014-09-17 11:23:39Z

1

If you are looking to inject sessions outside of the scope meaning into your custom extension.

I would do this.

     //AppKernel +add
      protected function initializeContainer() {
          parent::initializeContainer();
          if (PHP_SAPI == 'cli') {
              $this->getContainer()->enterScope('request');
              $this->getContainer()->set('request', new \Symfony\Component\HttpFoundation\Request(), 'request');
          }
      }

Then in your services container

      <!-- Custom Twig Extensions -->
      <service id="yourid" class="yourclasspath">
        <argument type="service" id="service_container" />
        <tag name="twig.extension" />
    </service>

Then in your twig.php

     class Twig extends \Twig_extension {
         private $request;

         public function __construct(Container $container) {
              $this->request = $container->get('request');
         }

         public function getFunctions() {
           return array(
            'count'  => new \Twig_Function_Method($this, 'count'),
           );
         }    

         public function count() {
         $session = $this->request->getSession();

         if(session->has('count')) {
             $session->set('count') += 1;
         } else {
             $session->set('count') = 1;
         }

         return $session->get('count');
      }
   }

Then the same in your twig

answered Sep 17, 2014 at 11:23

Matthew A Thomas

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6 Comments

user2818060 Over a year ago

syntax error unexpected ->(T_OBJECT_OPERATOR) ON THIS LINE if(session->has('count')) {

Jovan Perovic Over a year ago

@Matthew: I think you are overcomplicating it with service_container. See my answer based on yours but a bit simplified ;)

Matthew A Thomas Over a year ago

@user3785613 that is what you get for copying and pasting i left out the $ sign lol

user2818060 Over a year ago

how to solve alert issue function callback() { var page = {{ count}}; if (page >4) { alert("limit exceeded"); } else { alert("ok"); } } callback(); calling in twig {{ count }}

Jovan Perovic Over a year ago

Whoa, slow down. You're going from one error to another without even paying attention. First thing, you cannot just use {{ count }} because Twig will think that is a variable. Instead, use {{ count() }}. As for the AcmeExtension (woot?!) please edit you question with changes you applied - only then we shall be able to help you...

|

Matteo · Accepted Answer · 2014-09-17 13:38:29Z

1

Are you using some older version of Twig? Usage of Twig_Function_Method is deprecated.

If we ignore the subtle differences between older and new versions of Twig I would do it like this.

Note: This is actually @Matthew's solution and but I took liberty to simplify it a bit :)

Twig service definition

<!-- Custom Twig Extensions -->
<service id="yourid" class="yourclasspath">
    <argument type="service" id="session" />
    <tag name="twig.extension" />
</service>

Twig extension file

class Twig extends \Twig_extension {
     private $session;

     public function __construct(Session $session) {
         $this->session = $session
     }

     public function getFunctions() {
         return array(
             new \Twig_SimpleFunction('count', array($this, 'count') ),
         );
     }    

     public function count() {
         if($this->session->has('count')) {
             $this->session->set('count') += 1;
         } else {
             $this->session->set('count') = 1;
         }

         return $this->session->get('count');
     }
}

edited Sep 17, 2014 at 13:38

Matteo

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answered Sep 17, 2014 at 11:41

Jovan Perovic

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3 Comments

user2818060 Over a year ago

i have tried call count function using javascript but still there is the problem no alert works when page reload so where is the issue

Jovan Perovic Over a year ago

Try it first without any JS. Just print: <h1>THIS IS MY CONTER {{ count() }}. Then we can trace back the error...

user2818060 Over a year ago

its now been fixed thank jperovic sol i have placed script code after body beacause of might script might collapse in page now its working fine

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