Invalidating session in php

Session variables solve this problem by storing user information to be used across multiple pages (e.g. By default, session variables last until the user closes the browser.For example, a user submits a form which hits an update controller, and after processing the controller redirects the page to either the updated page or an error page.Flash messages set in the previous page request would be displayed immediately on the subsequent page load for that session.The Symfony Http Foundation component has a very powerful and flexible session subsystem which is designed to provide session management through a simple object-oriented interface using a variety of session storage drivers.


This is however just one application for flash messages.For simple applications it is usually sufficient to have one flash message per type, for example a confirmation notice after a form is submitted.Symfony provides two kinds of storage bags, with two separate implementations.Everything is written against interfaces so you may extend or create your own bag types if necessary.

In this case, managing the array becomes a burden because you have to retrieve the array then process it and store it again: is to provide a way of setting and retrieving messages on a per session basis.The usual workflow would be to set flash messages in a request and to display them after a page redirect.


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