How add to cart in magento works ?

As is it based on the session


We can add the product to cart to a particular user using external php call

 require_once '../app/Mage.php'; 
    Mage::getSingleton('core/session', array('name' => 'frontend')); 
    $session = Mage::getSingleton('customer/session');  
    $product = Mage::getModel('catalog/product')->load(99);  // Random product ID

    // get cart and add product
    $cart = Mage::getSingleton('checkout/cart'); 
    $cart->addProduct($product, 1);

    // update session

    // save the cart

As the above code not using any session and customer id am in a bit of confusion , and i called this externally . i asked this question because i first call this via poster , and when i logged in to the site the product is not there in cart for thatuser .


If you need to work on the most recent active cart of a specific customer I suggest you to use the Mage_Sales_Model_Quote::loadByCustomer() method.

Here is a sample code which assumes you are in a fully initialized Magento frontend application:

/** @var Mage_Customer_Model_Customer $customer */
$customer = Mage::getModel('customer/customer')->load(<customer_id>);

/** @var Mage_Sales_Model_Quote $quote */
$quote = Mage::getModel('sales/quote')->loadByCustomer($customer);
if (!$quote->getId()) {
/** @var Mage_Catalog_Model_Product $product */
$product = Mage::getModel('catalog/product')->load(<saleable_product_id>);

/** @var Mage_Sales_Model_Quote_Item $quoteItem */
$quoteItem = $quote->addProduct($product, /* qty = */ 1)->save();


Hope it helps.

  • can you give a sample of how to use it – KTM Apr 16 '15 at 10:50
  • and this is retrieval right , but how to set cart for a customer , – KTM Apr 16 '15 at 10:56
  • When i used it like :- $cart = Mage::getModel('sales/quote')->loadByCustomer($userId); print_r($cart);exit(); it wont print any – KTM Apr 16 '15 at 11:20
  • I edited my answer and added sample code; hope it helps. – Alessandro Ronchi Apr 16 '15 at 12:42

When you call the script it uses a Magento user session based on a cookie frontend to add the product to a particular cart tied to a session.

Since the script is probably called by a server or something like that it's not linked to your browsers session. In case this script works as it should calling it via your browser should add it to a cart that links to your browsers Magento session


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