Drupal commerce comes with a setting to display a message when adding products to your cart. This is formatted like: {product-title} added to your cart.
What if you want to add the quantity or SKU number in that description. Well, here you go with 2 simple functions.
/**
* Implements hook_rules_action_info_alter().
*/
function mymodule_rules_action_info_alter(&$actions) {
$actions['commerce_cart_add_to_cart_message']['callbacks']['execute'] = 'mymodule_cart_rules_add_to_cart_message';
}
function mymodule_cart_rules_add_to_cart_message($product) {
drupal_set_message(t('%title (%sku) added to your cart.', array('%title' => $product->title, '%sku' => $product->sku, '!cart-url' => url('cart'))));
}
That’s it!