Couple of Questions

The following code is what I have so far to create a simple shopping cart. Is there a different way of adding the id number of the product into the array? – As I don’t 100% understand what is happening. How do I notify the user that “The Item already exists”, if the cart already contains their selected item?

[CODE]$cart = $_SESSION[‘cart’];
if ($cart) {
$cart .= ‘,’.$_GET[‘id’];
} else {
$cart = $_GET[‘id’];
}
$_SESSION[‘cart’] = $cart;[/CODE]

How do I delete records from the shopping cart?

[CODE]<?php
session_start();

function writeShoppingCart() {
$cart = $_SESSION[‘cart’];
if (!$cart) {
return ‘<p>You have no items in your shopping cart</p>’;
} else {
// Parse the cart session variable
$items = explode(‘,’,$cart);
$s = (count($items) > 1) ? ‘s’:”;
return ‘<p>You have <a href=”cart.php”>’.count($items).’ item’.$s.’ in your shopping cart</a></p>’;
}
}

$cart = $_SESSION[‘cart’];
if ($cart) {
$cart .= ‘,’.$_GET[‘id’];
} else {
$cart = $_GET[‘id’];
}
$_SESSION[‘cart’] = $cart;

$total = 0;
echo ‘<table>’;
$id = $_GET[‘id’];

mysql_select_db(“MP3”, $con);

$items = explode(‘,’,$cart);
echo $cart;
foreach ($items as $item)

{
$result = mysql_query(“SELECT * FROM books WHERE id = ‘$item'”) or die(“Your have an error because:<br />” . mysql_error());
while($row = mysql_fetch_array($result))
{

echo ‘<tr>’;
echo ‘<td><a href=”cart.php?action=delete&id=’.$id.'” class=”r”>Remove</a></td>’;
echo ‘<td>’.$row[‘title’].’ by ‘.$row[‘author’].'</td>’;
echo ‘<td>&pound;’.$row[‘price’].'</td>’;
$total = $total + $row[‘price’];
echo ‘</tr>’;
}
}
echo ‘</table>’;
echo ‘<p>Grand total: &pound;’.$total.'</p>’;
?>[/CODE]

Also, I have a how do I put the add and delete code into a switch statement? I have the following code.

[CODE]switch ($action)
{
case ‘add’:
break;

case ‘delete’:
break;
}[/CODE]

Also in #PHP _↴