function module_hook

Determines whether a module implements a hook.


$module: The name of the module (without the .module extension).

$hook: The name of the hook (e.g. "help" or "menu").

Return value

TRUE if the module is both installed and enabled, and the hook is implemented in that module.

Related topics

9 calls to module_hook()
drupal_check_module in drupal/includes/
Checks a module's requirements.
field_help in drupal/modules/field/field.module
Implements hook_help().
field_system_info_alter in drupal/modules/field/field.module
Implements hook_system_info_alter().
help_page in drupal/modules/help/
Menu callback; prints a page listing general help for a module.
module_disable in drupal/includes/
Disables a given set of modules.

... See full list


drupal/includes/, line 679
API for loading and interacting with Drupal modules.


function module_hook($module, $hook) {
  $function = $module . '_' . $hook;
  if (function_exists($function)) {
    return TRUE;

  // If the hook implementation does not exist, check whether it may live in an
  // optional include file registered via hook_hook_info().
  $hook_info = module_hook_info();
  if (isset($hook_info[$hook]['group'])) {
    module_load_include('inc', $module, $module . '.' . $hook_info[$hook]['group']);
    if (function_exists($function)) {
      return TRUE;
  return FALSE;