<?php 
defined('C5_EXECUTE') or die(_("Access Denied."));
 
class PippoModel {
    /** 
     * Returns the total number of items in the 
        user's cart
     */
    public function getTotal() {
        return count($_SESSION['cart']);
    }
 
    /** 
     * Gets the contents of our cart, in a list of IDs
     */
    public function get() {
        return $_SESSION['cart'];
    }
 
 
 
 
    /** 
     * Adds a product ID to the cart
     */
    public function add($productID) {
        $_SESSION['cart'][] = $productID;
    }
 
    /** 
     * Removes a particular product ID from 
       the cart.
     */
    public function remove($productID) {
       ;
 
        foreach($_SESSION['cart'] as  $key => $_productID) 
        {
 
            if ($productID == $_productID) {
                unset($_SESSION['cart'][$key]);
            }
        }
    }
}
 

 
<?php  
 
Loader::model('custom/pippo'); 
class PippoController extends Controller {
 
    private $cart;
    public function on_start() {
 
        $this->cart = new PippoModel();
        $this->set('items', $this->cart->get());
    }
 
    public function add() {
 
        $productID = $this->post('productID');
        $this->cart->add($productID);
        $this->set('message', 
              'Product added successfully.');
        $this->set('items', $this->cart->get());       
 
    }
 
    public function remove($productID) {
        $this->cart->remove($productID);
        $this->set('message', 
              'Product removed successfully.');
         $this->set('items', $this->cart->get());
 
    }
     public function total() {
 
        $this->set('total', $this->cart->getTotal() );
 
    }
 
}
 
 
 
 
 

 
<?php
Loader::model('custom/pippo'); 
if (isset($message)) {
    print $message . '<br><br>';
}
 
$cart = new PippoModel();
 
 foreach($items as $it) { 
    echo 'Product ID '.$it.' in the cart   <a href="'.$this->action('remove', $it).'">Remove product</a><p></p>';
 
 } 
 
 echo "Total ".$cart->getTotal();
 
echo "<h2>Add a Product</h2>".$total;
?>
<form method="post"   action="<?php echo $this->url('pippo', 'add')?>">
  Enter the product ID:
<input type="text" name="productID" value="" />
<input type="submit" value="Submit" />
</form>