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7 system.api.php hook_permission()

Define user permissions.

This hook can supply permissions that the module defines, so that they can be selected on the user permissions page and used to grant or restrict access to actions the module performs.

Permissions are checked using user_access().

For a detailed usage example, see page_example.module.

Return value

An array whose keys are permission names and whose corresponding values are arrays containing the following key-value pairs:

  • title: The human-readable name of the permission, to be shown on the permission administration page. This should be wrapped in the t() function so it can be translated.
  • description: (optional) A description of what the permission does. This should be wrapped in the t() function so it can be translated.
  • restrict access: (optional) A boolean which can be set to TRUE to indicate that site administrators should restrict access to this permission to trusted users. This should be used for permissions that have inherent security risks across a variety of potential use cases (for example, the "administer filters" and "bypass node access" permissions provided by Drupal core). When set to TRUE, a standard warning message defined in user_admin_permissions() and output via theme_user_permission_description() will be associated with the permission and displayed with it on the permission administration page. Defaults to FALSE.
  • warning: (optional) A translated warning message to display for this permission on the permission administration page. This warning overrides the automatic warning generated by 'restrict access' being set to TRUE. This should rarely be used, since it is important for all permissions to have a clear, consistent security warning that is the same across the site. Use the 'description' key instead to provide any information that is specific to the permission you are defining.

See also


Related topics

43 functions implement hook_permission()

10 invocations of hook_permission()


drupal/modules/system/system.api.php, line 1933
Hooks provided by Drupal core and the System module.


function hook_permission() {
  return array(
    'administer my module' => array(
      'title' => t('Administer my module'), 
      'description' => t('Perform administration tasks for my module.'),