Woocommerce add_to_cart not working if cart is empty

Question

I have made a simple script in PHP to add a product to the WooCommerce cart:

WC()->cart->add_to_cart(43, 2);

The code is made in a custom plugin.

However, if the product is added as the first pproduct in the cart, the function is not working. If I add another product to the cart, and then run the script, is works just fine.

I think it is because the cart is somehow not initialized the right way/session is not created?

What am I missing?

Answer 1

Try following:

session_start();
WC()->cart->set_cart_cookies();
WC()->cart->add_to_cart(43,2);