Auto logout current session if trying to login as different user

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Hi there,

Just a quick question:

I want to create an if statement that automatically destroy the current session when somebody click 'Log in' after entering their details in my login form. I would also like the new session to be created as the old session is destroyed, meaning the first session's username changes to the new sessions username.

Pseudo Code:

PHP

// if session exists (if a user is logged in) when clicking 'Log in' after entering different username/password
{
//destroy sessions and create new session with the details submitted
}
else
{
//session doesnt exist, so log in the user (meaning the destroy session isnt needed)
}

This is the code that will follow, the code is used to start a session from details (stored as variables) from a form using POST.

PHP

$username = strtolower($_POST['username']);
$password = strtolower($_POST['password']);

if ($username&&$password)
{//starts validation and session start functionality

Thanks!

Posted 31-Jul-14 6:17am

jba1991

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nice_hand23 · Answer 1 · 2014-08-07T11:19:00

The first sentence of your question is easy to solve:

PHP

session_name($username);
session_start();

thats all for both cases in your first code-box. You don't need to destroy the session manually, when you use the username for the sessionname. This destroys the session automatically, when $username is different to the sessionname.
(look at: php.net [^])

But this means for your second sentence of your question that this is quite harder to reach.
In this case you need to overwrite the SessionHandler [^] or its interface.

Maybe think about a static sessionname and set the username as a cookie or in db (as user_id).