I have several websites in one domain (virtual host):
website.com/site1, website.com/site2 etc. 
On each site there is a authentification, which saves the username in Session.
The problem is:
If I'm on site1, and, let's say, Alex accecced to site2 from my browser, site1 would think that I'm Alex. And if I do something, Alex will be written in the DB.
One solution, is to check whether the Session and the username is the same on each action.
Is there a solution to set different $_SESSION['name'] for site1 and site2, using the same $_SESSION['name'] variable?