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I'm from custom php world but It looks like I can't just set a session variable in plain php. I'm playing around

use craft\web\Session;
...
$session = new Session();
$session->open();
$session->set("a", 'b');

or other choice, Craft::$app->getSession()->set("a", "b");

But i don't see it working, I don't see my storage session added in any way.

What am I doing wrong ?

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The Yii2 components behave a bit like singletons, you shouldn't create new ones manually. Instead, accessing them over the Craft::$app property is preferred, as you indicated. This should work:

$session = Craft::$app->getSession();
$session->set("a", "b");

How are you checking if the session value got set? It's likely you're just looking in the wrong place, the default session component is file-based now if I recall correctly. You can check if a session variable exists and/or what value it holds like this:

Craft::dd($session->has('a'));
Craft::dd($session->get('a'));
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    That's exactly what I needed ! Thank you very much, it works ! Nov 24 at 16:50

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