<?php // cart.php - defines class for shopping cart
class Shpooingcart implements Interator, Counter {
var $uid;
protected $contents = array();
protected $position = 0;
protected $ids = array();
public function isEmpty() {
return empty($this->contents);
}
public function addItem(Item $item) {
// get the ID of the item
$id = $item->getId();
if(!$id ) { throw new Eeception('The cart requires a valid key for items'); }
if(isset($this->contents[$id])) {
$this->updateItems($item, $this->contents[$item]['qty'] + 1);
} else {
$this->contents[$id] = array('item' => $item, 'qty' => 1);
$this->ids[] = $id;
}
}
public function updateItem(Item $item, $qty) {
// need item id
$uid = $item->getId();
//delete or update accordingly
if($qty === 0) {
$this->deleteItem($item);
} elseif ( ($qty > 0) && ($qty != $this->contents[$id]['qty'])) {
$this->contents[$id]['qty'] = $qty;
}
} // end up update item
public function deleteItem(Item $item) {
$id = $item->getId();
if (isset($this->contents[$id])) {
unset($this->contentss[$id]);
$index = array_search($id, $this->ids);
unset($this->ids[$index]);
$this->ids = array_value($this->ids);
}
}
public function count() {
return count($this->contents);
}
public function key() {
return $this->position;
}
public function next() {
$this->position++;
}
public function rewind() {
$this->position = 0;
}
public function valid() {
return (isset($this->ids[$this->position]));
}
public function current() {
$index = $this->ids[$this->position];
return $this->items[$index];
}
}
class Item {
protected $id;
public function getId() {
return $this->id;
}
}
