Managing session variables in PHP is really easy.
First thing to do is to initialise the variable. For instance
$_SESSION["myvariable"] = myvalue;
To use it, in another page, you can then just use $_SESSION["myvariable"].
Just remember to put at the top of the code this instruction:
session_start();
Actually, this will not re-initialise the session, but will create the session object with the current session variables.
