Help me in session based authentication and browsing - Object Oriented Portal System

[mahendrakalkura]

good morning everybody

i want to make the following script, program whatever you may call it

i have made a simple website

there will be many registered users

i will make an object oriented authentication system

i already wrote a class

<?php

class user {

    var $session_id;
    var $user_id;  
    var $user_full_name;
    var $user_login_name;
    var $user_email;		 
    var $user_password;

}

?>

when a person first comes to my site he will be asked for user name and password

he will be validated based on this

if he is indeed a registered user then an object of the class user will be instantiated

the variable session_id will now have his session id

and all other variables will have that particular users values extracted from a database

now my problem is how will store this object and where will i store it ( cant use cookies ) for

his visits to other pages so that the stupid web server wont ask for his login again and again

also how will i check if a user is logged in or not

( actually this is a part of my project to make an object oriented portal system, anyone

interested in being a part of this can contact me or PM me )

anyone who can help me in this just reply to this post or mail me ok

my mail id : [e-mail]

thanks

if this post is not fit to be in this category please move it where it belongs

thanks again