Cartthrob - Changing prices in the cart via Hook.

Question

I've set up a fabric shop, which requires free sample purchasing. I've implemented this without issue using on the fly products for each fabric. However, the client now requires that after x amount of samples have been added (across all products) each additional sample should be charged.

I've spent several days trawling the developer docs & internet trying to find a solution, but so far it has eluded me. Can you please confirm the correct procedure for modifying a dynamic products price which is already in the cart. I've looked at the cartthrob_update_cart_end hook and $this->core->cart - but can't seem to figure it out.

Thank you.

Answer 1

Sounds like you are building a custom extension. A start might look something like this.

Would have to know a little bit more about your products to give you a better example.

public function cartthrob_update_cart_end()
{
$items = ee()->cartthrob->cart->items_array();

foreach($items as $key => $value)
{

    if($value['title'] == "Some on the Fly Product")
    {
        // do something
    }

}

$this->EE->cartthrob->cart->save();

} // END cartthrob_update_cart_end

Answer 2

Using mjr's code as a basis, to actually edit the cart items data you will need to use the add_item() method which will implement an update() if the item exists in the cart already. You don't need the save() method either. So to change a product price to 10 for example:

public function cartthrob_update_cart_end()
{
    $items = ee()->cartthrob->cart->items_array();

    foreach($items as $item)
    {
        if($item['title'] == "Some on the Fly Product")
        {
            $item['price'] = 10; 
            ee()->cartthrob->cart->add_item($item);
        }
    }
} // END cartthrob_update_cart_end