Separating the scope of variables in session is a good practice for organizing attributes.

Symfony comes with the Session component, a powerful way to manage the session.

Imagine you want to store some attributes of some volatile structure in your application. You can store them in this way:

$session->set('promo_code', 'MY_PROMO_CODE');
$session->set('promo_name', 'MY_PROMO_NAME');

That’s all right. But when the number of attributes grows in your application, there will be a point in time in which you’ll find a long list of attribute mixed together with different purpose.

There is a better way to deal with this drawback: using the NamespacedAttributeBag.

The Dependency Injection component allows you to switch the attribute bag used by the Session component, in this case the NamespacedAttributeBag.

It is simply as appending to your parameters this:

parameters:
session.attribute_bag.class: Symfony\Component\HttpFoundation\Session\Attribute\NamespacedAttributeBag

NamespacedAttributeBag activates the namespace behaviour in storing and retrieving attributes from the session.

Now, you can create different watertight attributes separing them with backslash

$session->set('promo/code', 'my_code_value');
$session->set('promo/name', 'my_name_value');

and retrieve a single attribute, or the whole namespace:

$session->get('promo/code'); // returns 'my_code_value'
$session->get('promo'); // returns the array with 'code' and 'name' in it

In the same way, you can remove from the session, the single attribute or the whole subspace:

$session->remove('promo/code'); // it will remove only the code attribute
$session->remove('promo'); // it will remove the whole promo namespace
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