What happens if session name is same on two different websites?

Question

I have a two diff. project on my XAMPP say it is Project1 and Project2.
When i login with Project1, i check authentic

Answer 1

I think if we use a security algorithm like MD5 to encrypt the session which you'll using to login. That will work without problem. For example:

$name_session='username';
$name_session=md5(md5(md5($name_session));
$_SESSION[$name_session]="username_logged";