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Add ‘Customers Also Purchased’ to the Cart Page on Interspire Shopping Cart

“Customers Also Purchased” should be on the cart page, right?

The Interspire Shopping Cart has a “Customers Also Bought” feature, but for some reason, they didn’t think to make it functional on the cart page — one of the most useful (and obvious) places to have the feature. This modification will allow you to place the SideProductAlsoBought panel into your theme’s cart.html template, using the %%Panel.SideProductAlsoBought%% placeholder in the template.

Goals of this mod

Keep the existing “Also Bought/Purchased” functionality working on product pages
Add “Also Bought/Purchased” functionality to the cart page
Give an option where it will only display “Also Bought” for the most recently added product

With those goals in mind, I went about implementing a solution, which is below:

Find the following code in `/includes/display/SideProductAlsoBought.php`:

$query = "
	SELECT ordprodid
	FROM [|PREFIX|]order_products
	WHERE orderorderid IN (SELECT orderorderid FROM [|PREFIX|]order_products WHERE ordprodid='".$GLOBALS['ISC_CLASS_PRODUCT']->GetProductId()."') AND ordprodid != ".$GLOBALS['ISC_CLASS_PRODUCT']->GetProductId()."
	GROUP BY ordprodid
	ORDER BY COUNT(ordprodid) DESC
";

Add replace it with this code:

// Begin: Allow users also bought for recently added products
$OnlyRecentlyAdded = false; // make true to only show Also Bought for the product that was just added.

if(isset($GLOBALS['ISC_CLASS_CART'])) {
	if($OnlyRecentlyAdded && isset($_REQUEST['suggest'])) {
		$cartProduct = $GLOBALS['ISC_CLASS_CART']->api->GetProductInCart($_REQUEST['suggest']);
		if(is_array($cartProduct)) {
			$this->newCartItem = $_REQUEST['suggest'];
			$productId = $cartProduct['product_id'];
		}

		$queryIds[0] = " ordprodid='".$productId."'";
		$queryIds[1] = " ordprodid !=".$productId;

	} else {
		$cartProducts = $GLOBALS['ISC_CLASS_CART']->api->GetProductsInCart();
		if(is_array($cartProducts)) {
			foreach($cartProducts as $product) {
				$i++;
				if(!in_array($product['product_id'], $productIds)) {
					$productIds[] = $product['product_id'];
					$queryIds[0] .= ' ordprodid=\''.$product['product_id'].'\'';
					$queryIds[1] .= ' ordprodid != '.$product['product_id'];
				}
				if(isset($cartProducts[$i]) && !in_array($cartProducts[$i]['product_id'],$productIds)) {
					$queryIds[0] .= ' OR';
					$queryIds[1] .= ' AND';
				}
			}
		}
	}

} else {
	$queryIds[0] = " ordprodid='".$GLOBALS['ISC_CLASS_PRODUCT']->GetProductId()."'";
	$queryIds[1] = " ordprodid !=".$GLOBALS['ISC_CLASS_PRODUCT']->GetProductId();
}

$query = "
	SELECT ordprodid
	FROM [|PREFIX|]order_products
	WHERE orderorderid IN (SELECT orderorderid FROM [|PREFIX|]order_products WHERE".$queryIds[0]."  AND".$queryIds[1]."
	GROUP BY ordprodid
	ORDER BY COUNT(ordprodid) DESC
";
// End: Allow users also bought for recently added products

This adds a little load time to the cart.php page, but it will help cross-sell products.