Re: [PHP] Object Undefinded index

[Allex]

I'm just adding a working example to my last post; check the 
implementation part at the end of the script;

Cheers, Allex

--------------------
<?php
  class Item {

    var $_productID;
    var $_quantity;
    function Item($productID, $quantity) {
      $this->_productID = $productID;
      $this->_quantity = $quantity;
    }
    function setProductID($productID) {
      $this->_productID = $productID;
    }
    function getProductID() {
      return $this->_productID;
    }
    function setQuantity($quantity) {
      $this->_productID = $quantity;
    }
    function getQuantity() {
      return $this->_quantity;
    }
  }

  class Cart {

    var $_items;

    function Cart() {
      $this->_items = array();
    }
    function addItem($item) {
      $this->_items[] = $item;
    }
    function getItems() {
      return $this->_items;
    }
  }

// test implementation

$MyCart = new Cart();
$MyCart->addItem(new Item("10", 20));
$MyCart->addItem(new Item("20", 45));
$MyCart->addItem(new Item("30", 55));
foreach ($MyCart->getItems() as $item) {
  echo "ProductId: " . $item->getProductID() . " Quantity: " . 
$item->getQuantity() . "<br>";
}



?>







Steve Turner wrote:

I am just learning to use objects. I am messing around with a shopping cart
object, but am having confusing problems. I am getting an undefined index
error when trying to assign a key value pair to an array variable within an
object. I am confused becuase I believe this is how you assign array
variables outside an object. It acts like the variable is undefined. Thanks
for the help.
Steve Turner

//--------------------------------------------------
class Cart
{
    var $items;  // Items in shopping cart
    // Add $quantity articles of $product_id to the cart

    function add_item ($product_id, $quantity = 1)
    {
        $this->items[$product_id] += $quantity;
    }
    // Take $quantity articles of $product_id out of the cart

    function remove_item ($product_id, $quantity)
    {
        if ($this->items[$product_id] > $quantity)
  {
            $this->items[$product_id] -= $quantity;
            return true;
        }
  else
  {
            return false;
        }
    }
}
//I am interacting with the object with the following code
$cart = new Cart;
$cart->add_item("10", 1);
foreach ($cart as $product_id => $quantity)
{
echo $product_id . "<br>" . $quantity;
}
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