The block should not get cached.
This setting should be used:
- For simple blocks (notably those that do not perform any db query), where querying the db cache would be more expensive than directly generating the content.
- For blocks that change too frequently.
File
- includes/
common.inc, line 121 - Common functions that many Drupal modules will need to reference.
Code
define('DRUPAL_NO_CACHE', -1)