exclude cache group

Thanks for the question. The WP_Object_Cache API supports the use of

wp_cache_add_non_persisted_group( ‘groupname’ );

as the approved way to suppress the caching of a particular cache group. Call this from init on every page view.

I searched the WP code base and didn’t find this funciton, only

/**

 * Adds a group or set of groups to the list of non-persistent groups.

 *

 * @since 2.6.0

 *

 * @param string|string[] $groups A group or an array of groups to add.

 */

function wp_cache_add_non_persistent_groups( $groups ) {

  // Default cache doesn’t persist so nothing to do here.

}