nakupni košík

name=button[id-vyrobku]

<?php
/**
 * Basket
 *
 * Jednoduchy nakupny kosik cez SESSION
 *
 * @author   stenley <stenley@webdev.sk>
 * @version   1.1
 */

class Basket
{
   private $BASKET;   //obsah kosiku
   private $PRICE;      //cena produktov v kosiku
   
   function __construct()
   {
      if(!isset($_SESSION['basket'])) {
         $_SESSION['basket'] = array();
         $_SESSION['price'] = 0;
      }
      
      $this->BASKET = &$_SESSION['basket'];
      $this->PRICE = &$_SESSION['price'];
   }

   //prida novu polozku do kosika
   public function AddItem($itemData,$itemDataKey='')
   {
      if(empty($itemDataKey)) {
         $this->BASKET[] = $itemData;
      } else {
         if(array_key_exists($itemDataKey,$this->BASKET)) {
            $this->BASKET[$itemDataKey]['quantity'] += $itemData['quantity'];
         } else {
            $this->BASKET[$itemDataKey] = $itemData;
         }
      }
   }

   //ziska data z kosika
   public function GetData()
   {
      return $this->BASKET;
   }

   //ziska celkovu sumu kosika
   public function GetPrice()
   {
      $tmp_price = 0;

      $arrData = $this->GetData();

      foreach($arrData as $item) {
         $tmp_price += $this->SumPrice($item);
      }

      $this->PRICE = $tmp_price;

      return $this->PRICE;
   }

   //vymaze polozku z kosika
   public function DeleteItem($itemDataKey)
   {
      unset($this->BASKET[$itemDataKey]);
   }

   //spocita celkovu sumu v kosiku
   private function SumPrice($item)
   {
      $tmp_price = 0;

      if(array_key_exists("price",$item)) {
         $tmp_price += $item['price']*$item['quantity'];
      }

      return $tmp_price;
   }

   //vyprazdni kosik
   public function DeleteBasket()
   {
      $this->BASKET = array();
      $this->PRICE = 0;
   }
}
?>

<?
$produkty[1] = array(
   'nazov' => 'Produkt 1',
   'popis' => 'popis k 1.produktu',
   'cena' => 30
);
$produkty[2] = array(
   'nazov' => 'Produkt 2',
   'popis' => 'popis k 2.produktu',
   'cena' => 50
);

<?
session_start();

$kosik = new Basket;

if(isset($_GET['empty'])) {
   //vymazanie obsahu kosiku
   $kosik->DeleteBasket();
   header("Location: ./");   
}

if(!empty($_GET['id']))
{
   $id = $_GET['id'];
   if(array_key_exists($id,$produkty))
   {
      //pridanie produktu (1ks) do kosiku
      $kosik->AddItem(array('title'=>$produkty[$id]['nazov'], 'price'=>$produkty[$id]['cena'],'quantity'=>1),$id);
      header("Location: ./");
   }
}
?>
<h1>Obsah kosika</h1>
<?php
foreach($kosik->GetData() as $item)
{
   echo $item['title'].' (cena: '.$item['price']*$item['quantity'].',-Sk/'.$item['quantity'].'ks)<br>';
}

echo 'Celkova cena: '.$kosik->GetPrice();
?>
<p>
<?php
foreach($produkty as $id => $produkt) {
   echo '<a href="?id='.$id.'">Pridat do kosika '.$produkt['nazov'].'</a><br>';
}
?>
</p>
<p><a href="?empty">Vymazat obsah kosika</a></p> 

<input type="hidden" value="polozka_kod" name="009855422665" />
<?
if (is_numeric($polozka_kod)) {
//vykonanie urcitej akcie...
}else{
echo "Neplatne zadany kod!";
}

<input type=hidden name=id value=$id_produktu>
<input tpye=submit name=submit>

if (isset($_POST['submit'])) { //odeslano
  $prod_id = (int)$_POST['id'];
}