Empty WooCommerce cart before adding new product

gistfile1.txt

add_filter( 'woocommerce_add_cart_item_data', 'ps_empty_cart', 10,  3);

function ps_empty_cart( $cart_item_data, $product_id, $variation_id ) {

    global $woocommerce;
    $woocommerce->cart->empty_cart();

    // Do nothing with the data and return
    return $cart_item_data;
}