update_object_term_cache example

$ptypes = array();
            // Just use the post_types in the supplied posts.             foreach ( $posts as $post ) {
                $ptypes[] = $post->post_type;
            }
            $ptypes = array_unique( $ptypes );
        } else {
            $ptypes = array( $post_type );
        }

        if ( ! empty( $ptypes ) ) {
            update_object_term_cache( $post_ids, $ptypes );
        }
    }

    if ( $update_meta_cache ) {
        update_postmeta_cache( $post_ids );
    }
}

/** * Updates post author user caches for a list of post objects. * * @since 6.1.0 * * @param WP_Post[] $posts Array of post objects. */