add custom price to cart

hopefully someone can offer some help on this as I am a little confused :blush:

I have added a simple calculation script in tpl.product_info_display.php that requires users to input the width and height of the product they require. A simple calculation is then done in the backend to produce the price. I now need to add that price to cart when the customer clicks add to cart or I could add it to the cost of the product. Whichever is simpler.

An example is:

Customer wants to purchase t-shirt @ £1.25 They then want to customise it and require the customisation to be 8 inches x 2.5 inches. My simple script then works out the price and this is added to the existing price of the t-shirt, or if simpler, added to cart with the t-shirt when customer clicks add to cart.

Does anyone know how this can be done or lead me in the right direction?

johndoes:

Does anyone know how this can be done or lead me in the right direction?

There'll be many ways to do this. One of the simplest (in my opinion) is, when the calculation has been made in the backend, save it as a $_SESSION variable, then read it back in and add it to the item cost as/when the product is added to the cart (whatever page that may be on).

Well, that's the basic theory/principle. Whether you'll find it to be of any useful help is another matter.

Cheers
Rod

Thanks Rod. PHP isn't my strong point though. Would you know of any previous forum posts of other peoples attempts at something similar or even any particular keywords to get me started?

johndoes:

Thanks Rod. PHP isn't my strong point though. Would you know of any previous forum posts of other peoples attempts at something similar or even any particular keywords to get me started?

Try this:
http://www.w3schools.com/php/php_sessions.asp

Cheers
Rod