I have a hook_form_alter in a module, and it should be firing, but it appears it's not. I've cleared caches and rebuilt the registry. Is there someplace in the database or somewhere else where I can see if my hook is registed? FWIW here is my hook:
/**
* Implements hook_form_alter
*/
function my_module_form_alter(&$form, &$form_state, $form_id) {
drupal_set_message($form_id);
}
The hook implementations ARE cached inside the database.. this is why it's necessary to clear cache in order for a newly implemented hook to fire.
Taking a look, inside the cache_bootstrap table, there is a row with cid value of module_implements, and it's data value is a very large serialized string. When unserialized, it is an array of the form
'hook_name' => array('module1', 'module2', 'module3', ...)
The hook names have the hook_ beginning lopped off, so hook_block_info() will appear as block_info. I believe the value is the list of modules which implement that hook, so...
'block_info' => array('views', 'webform', 'my_module')
Means that the following hooks are registered and should be fired:
views_block_info()
webform_block_info()
my_module_block_info()
cache_bootstrap table with the new serialized value, then confirm the hook is no longer firing.
Commented
Apr 21, 2015 at 18:05
hook_menu_links_discovered_alter() in a custom module that's trying to add a link to the admin toolbar. And when I put a kint() statement in the hook, it only fires when I clear the cache, and I need it to fire every (administrator) page load.
Commented
Jun 12, 2019 at 12:29
hook_init() runs on every non-cached page load and would accomplish that part. Bear in mind that implementing hook_init is discouraged for performance reasons.
Commented
Jun 12, 2019 at 13:55
If you're running drush, you could try fn-hook. That will print out a list of all the modules that are using a given hook. At the very least this will tell you if the Drupal thinks the module is using the hook
