Only one currently added product into Woocommerce cart?

Question

I would like Woocommerce to only allow 1 product in the cart. If a product is already in the cart and another one is added then it should remove the previous one.

I foun

Answer 1

This working perfecty on Woocommerce 3.3.X

add_filter( 'woocommerce_add_to_cart_validation', 
'bbloomer_only_one_in_cart', 99, 2 );

function bbloomer_only_one_in_cart( $passed, $added_product_id ) {

global $woocommerce;

// empty cart: new item will replace previous
$woocommerce->cart->empty_cart();

// display a message if you like
wc_add_notice( 'Product added to cart!', 'notice' );

return $passed;
}