1. 1.17.x includes/common.inc BACKDROP_CACHE_CUSTOM
  2. 1.15.x includes/common.inc BACKDROP_CACHE_CUSTOM
  3. 1.16.x includes/common.inc BACKDROP_CACHE_CUSTOM

The block is handling its own caching in its hook_block_view().

This setting is useful when time based expiration is needed or a site uses a node access which invalidates standard block cache.

Related topics

File

includes/common.inc, line 139
Common functions that many Backdrop modules will need to reference.

Code

define('BACKDROP_CACHE_CUSTOM', -2)