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Chapter 19: Using Drupal's APIs in a Mod... > Call All Implementations of a Hook
Call All Implementations of a Hook
You know from your investigation into finding permissions' machine names that the information you need is in modules' implementations of hook_permissions(). How do you get this information for yourself? There's a function for that: module_invoke_all() is used for invoking all implementations of a given hook. From a module, all implementations of hook_permission() in Drupal can be invoked, and their data gathered, with the following single line:
  $permissions = module_invoke_all('permission');
The $permissions variable is now an array keyed by permission machine name, but the values are another array that includes the permission description and other information you don't need. It can be cycled through quickly and the extra data dropped, like so:
