php-user-session-intro
# not production safe method...
<?php
session_start();
if(isset($_SESSION['views']))
$_SESSION['views'] = $_SESSION['views']+ 1;
else
$_SESSION['views'] = 1;
echo "views = ". $_SESSION['views'];
# erase all data in the 'cart' variable
if(isset($_SESSION['cart']))
unset($_SESSION['cart']);
# completely destroy the session (erase all data)
session_destroy();
?>