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5 – 6 module_implements($hook, $sort = FALSE, $refresh = FALSE)
8 module_implements($hook, $sort = FALSE)
7 module_implements($hook, $sort = FALSE, $reset = FALSE)

Determine which modules are implementing a hook.


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

$sort By default, modules are ordered by weight and filename, settings this option to TRUE, module list will be ordered by module name.

$refresh For internal use only: Whether to force the stored list of hook implementations to be regenerated (such as after enabling a new module, before processing hook_enable).

Return value

An array with the names of the modules which are implementing this hook.

Related topics

▾ 23 functions call module_implements()

comment_invoke_comment in modules/comment/comment.module
Invoke a hook_comment() operation in all modules.
comment_render in modules/comment/comment.module
Renders comment(s).
drupal_mail in includes/
Send an e-mail message, using Drupal variables and default settings. More information in the PHP function reference for mail()
drupal_prepare_form in includes/
Prepares a structured form array by adding required elements, executing any hook_form_alter functions, and optionally inserting a validation token to prevent tampering.
help_links_as_list in modules/help/help.module
help_menu in modules/help/help.module
Implementation of hook_menu().
module_disable in includes/
Disable a given set of modules.
module_enable in includes/
Enable a given list of modules.
module_invoke_all in includes/
Invoke a hook in all enabled modules that implement it.
node_access_rebuild in modules/node/node.module
Rebuild the node access database. This is occasionally needed by modules that make system-wide changes to access levels.
node_access_write_grants in modules/node/node.module
This function will write a list of grants to the database, deleting any pre-existing grants. If a realm is provided, it will only delete grants from that realm, but it will always delete a grant from the 'all' realm. Modules which utilize…
node_configure in modules/node/node.module
Menu callback; presents general node configuration options.
node_invoke_nodeapi in modules/node/node.module
Invoke a hook_nodeapi() operation in all modules.
node_view in modules/node/node.module
Generate a display of the given node.
search_preprocess in modules/search/search.module
Invokes hook_search_preprocess() in modules.
system_performance_settings in modules/system/system.module
taxonomy_link in modules/taxonomy/taxonomy.module
Implementation of hook_link().
upload_js in modules/upload/upload.module
Menu-callback for JavaScript-based uploads.
user_authenticate in modules/user/user.module
user_auth_help_links in modules/user/user.module
user_view in modules/user/user.module
_db_rewrite_sql in includes/
Helper function for db_rewrite_sql.
_element_info in includes/
Retrieve the default properties for the defined element type.


includes/, line 340

function module_implements($hook, $sort = FALSE, $refresh = FALSE) {
  static $implementations;

  if ($refresh) {
    $implementations = array();

  if (!isset($implementations[$hook])) {
    $implementations[$hook] = array();
    $list = module_list(FALSE, TRUE, $sort);
    foreach ($list as $module) {
      if (module_hook($module, $hook)) {
        $implementations[$hook][] = $module;

  // The explicit cast forces a copy to be made. This is needed because
  // $implementations[$hook] is only a reference to an element of
  // $implementations and if there are nested foreaches (due to nested node
  // API calls, for example), they would both manipulate the same array's
  // references, which causes some modules' hooks not to be called.
  // See also
  return (array) $implementations[$hook];