Code-Snippets-Functions/Execute a function on a child site/WooCommerce/empty-cart-when-adding-second-item.txt

add_filter( 'woocommerce_add_to_cart_validation', function( $passed, $product_id, $quantity ) {
	if( ! WC()->cart->is_empty()) {
		WC()->cart->empty_cart();
	}
	return $passed;
}, 20, 3 );