1 system.api.php hook_hook_info()

Defines one or more hooks that are exposed by a module.

Normally hooks do not need to be explicitly defined. However, by declaring a hook explicitly, a module may define a "group" for it. Modules that implement a hook may then place their implementation in either $module.module or in $module.$group.inc. If the hook is located in $module.$group.inc, then that file will be automatically loaded when needed. In general, hooks that are rarely invoked and/or are very large should be placed in a separate include file, while hooks that are very short or very frequently called should be left in the main module file so that they are always available.

Return value

An associative array whose keys are hook names and whose values are an: associative array containing:

  • group: A string defining the group to which the hook belongs. The module system will determine whether a file with the name $module.$group.inc exists, and automatically load it when required.

See system_hook_info() for all hook groups defined by Backdrop core.

See also


Related topics


core/modules/system/system.api.php, line 36
Hooks provided by Backdrop core and the System module.


function hook_hook_info() {
  $hooks['token_info'] = array(
    'group' => 'tokens',
  $hooks['tokens'] = array(
    'group' => 'tokens',
  return $hooks;