constant DRUPAL_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

Block Caching
Constants that define each block's caching state.

File

includes/common.inc, line 135
Common functions that many Drupal modules will need to reference.

Code

define('DRUPAL_CACHE_CUSTOM', -2)

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https://api.drupal.org/api/drupal/includes!common.inc/constant/DRUPAL_CACHE_CUSTOM/7.x