Example 11-4. cart.4 empties the cart
<?php
// This script empties the cart and deletes the session
include 'include.inc';
set_error_handler("errorHandler");
// Initialise the session - this is needed before
// a session can be destroyed
session_start( );
// Is there a cart in the database?
if (session_is_registered("order_no"))
{
// Open a connection to the DBMS
if (!($connection = @ mysql_connect($hostName,
$username,
$password)))
showerror( );
if (!mysql_select_db($databaseName, $connection))
showerror( );
// First, delete the order
$query = "DELETE FROM orders
WHERE cust_id = -1
AND order_id = $order_no";
if (!(@ mysql_query ($query, $connection)))
showerror( );
// Now, delete the items
$query = "DELETE FROM items
WHERE cust_id = -1
AND order_id = $order_no";
if (!(@ mysql_query ($query, $connection)))
showerror( );
// Finally, destroy the session variable
session_unregister("order_no");
}
else
{
session_register("message");
$message = "There is nothing in your cart.";
}
// Redirect the browser back to the calling page.
if (session_is_registered("referer"))
{
session_unregister("referer");
header("Location: $referer");
exit;
}
else
header("Location: $HTTP_REFERER");
?>
by updated
