Buy only 1 product, no more

[Pierre SKLI]

Hi everybody,

It's been a week I've been digging into Prestashop for an e-commerce website, and that's a very good OpenSource code...
My client would like a special functionality: he'd like visitors to buy only 1 product from the website. If 1 product is already in the shopping cart, it should shows an error.

Does anyone know the $variable to know the current number of product in the cart, and also in which file I should put my "if ($product_cart == 1)..." to check this before adding a new product?

I tried some code in cart.php, but doesn't seem to work... Anyway, once I have the $variable of current number of products in the cart, I'll be able to hide all the "add to card" buttons.

Thanks for the help,

Pierre