Magento auto remove out of stock items from shopping cart

Below Code will remove automatically product items from shopping cart page which are out of stock

In config.xml file:

<events>
  <controller_action_predispatch_checkout_cart_index>
    <observers>
      <namespace_module_autoremove_outofstock>
        <type>singleton</type>
        <class>namespace_module/observer</class>
        <method>removecartitemsofs</method>
      </namespace_module_autoremove_outofstock>
    </observers>
  </controller_action_predispatch_checkout_cart_index>
</events>

In Observer.php file:

public function removecartitemsofs($observer) {
    $quote = Mage::getModel('checkout/session')->getQuote();
    $cartItems = $quote->getAllItems();
    foreach ($cartItems as $item)
    {
        $productId = $item->getProductId();
        $product = Mage::getModel('catalog/product')->load($productId);
        $stockItem = $product->getStockItem();
        if(!$stockItem->getIsInStock())
        {
                Mage::helper('checkout/cart')->getCart()->removeItem($item->getId())->save();
        }
    }

}

Enjoy…..:)