/** * @snippet WooCommerce Max 1 Product @ Cart * @how-to Get CustomizeWoo.com FREE * @author Rodolfo Melogli * @compatible WC 5.1 * @donate $9 https://businessbloomer.com/bloomer-armada/ */ add_filter( 'woocommerce_add_to_cart_validation', 'bbloomer_only_one_in_cart', 9999, 2 ); function bbloomer_only_one_in_cart( $passed, $added_product_id ) { wc_empty_cart(); return $passed; }