Hooks

  1. 7 core/includes/module.inc hooks
  2. 6 core/includes/module.inc hooks

Allow modules to interact with the Drupal core.

Drupal's module system is based on the concept of "hooks". A hook is a PHP function that is named foo_bar(), where "foo" is the name of the module (whose filename is thus foo.module) and "bar" is the name of the hook. Each hook has a defined set of parameters and a specified result type.

To extend Drupal, a module need simply implement a hook. When Drupal wishes to allow intervention from modules, it determines which modules implement a hook and calls that hook in all enabled modules that implement it.

The available hooks to implement are explained here in the Hooks section of the developer documentation. The string "hook" is used as a placeholder for the module name in the hook definitions. For example, if the module file is called example.module, then hook_help() as implemented by that module would be defined as example_help().

The example functions included are not part of the Drupal core, they are just models that you can modify. Only the hooks implemented within modules are executed when running Drupal.

See also

Default theme implementations

Callbacks

File

core/includes/module.inc, line 589
API for loading and interacting with Drupal modules.

Functions

Namesort descending Location Description
hook_actions_delete core/modules/system/system.api.php Executes code after an action is deleted.
hook_action_info core/modules/system/system.api.php Declares information about actions.
hook_action_info_alter core/modules/system/system.api.php Alters the actions declared by another module.
hook_admin_paths core/modules/system/system.api.php Define administrative paths.
hook_admin_paths_alter core/modules/system/system.api.php Redefine administrative paths defined by other modules.
hook_aggregator_fetch core/modules/aggregator/aggregator.api.php Create an alternative fetcher for aggregator.module.
hook_aggregator_fetch_info core/modules/aggregator/aggregator.api.php Specify the title and short description of your fetcher.
hook_aggregator_parse core/modules/aggregator/aggregator.api.php Create an alternative parser for aggregator module.
hook_aggregator_parse_info core/modules/aggregator/aggregator.api.php Specify the title and short description of your parser.
hook_aggregator_process core/modules/aggregator/aggregator.api.php Create a processor for aggregator.module.
hook_aggregator_process_info core/modules/aggregator/aggregator.api.php Specify the title and short description of your processor.
hook_aggregator_remove core/modules/aggregator/aggregator.api.php Remove stored feed data.
hook_ajax_render_alter core/modules/system/system.api.php Alter the commands that are sent to the user through the Ajax framework.
hook_archiver_info core/modules/system/system.api.php Declare archivers to the system.
hook_archiver_info_alter core/modules/system/system.api.php Alter archiver information declared by other modules.
hook_batch_alter core/modules/system/system.api.php Alter batch information before a batch is processed.
hook_block_cid_parts_alter core/modules/block/block.api.php Act on block cache ID (cid) parts before the cid is generated.
hook_block_configure core/modules/block/block.api.php Define a configuration form for a block.
hook_block_info core/modules/block/block.api.php Define all blocks provided by the module.
hook_block_info_alter core/modules/block/block.api.php Change block definition before saving to the database.
hook_block_list_alter core/modules/block/block.api.php Act on blocks prior to rendering.
hook_block_save core/modules/block/block.api.php Save the configuration options from hook_block_configure().
hook_block_view core/modules/block/block.api.php Return a rendered or renderable view of a block.
hook_block_view_alter core/modules/block/block.api.php Perform alterations to the content of a block.
hook_block_view_MODULE_DELTA_alter core/modules/block/block.api.php Perform alterations to a specific block.
hook_boot core/modules/system/system.api.php Perform setup tasks for all page requests.
hook_comment_delete core/modules/comment/comment.api.php The comment is being deleted by the moderator.
hook_comment_insert core/modules/comment/comment.api.php The comment is being inserted.
hook_comment_load core/modules/comment/comment.api.php Comments are being loaded from the database.
hook_comment_presave core/modules/comment/comment.api.php The comment passed validation and is about to be saved.
hook_comment_publish core/modules/comment/comment.api.php The comment is being published by the moderator.
hook_comment_unpublish core/modules/comment/comment.api.php The comment is being unpublished by the moderator.
hook_comment_update core/modules/comment/comment.api.php The comment is being updated.
hook_comment_view core/modules/comment/comment.api.php The comment is being viewed. This hook can be used to add additional data to the comment before theming.
hook_comment_view_alter core/modules/comment/comment.api.php The comment was built; the module may modify the structured content.
hook_contextual_links_view_alter core/modules/contextual/contextual.api.php Alter a contextual links element before it is rendered.
hook_countries_alter core/modules/system/system.api.php Alter the default country list.
hook_cron core/modules/system/system.api.php Perform periodic actions.
hook_cron_queue_info core/modules/system/system.api.php Declare queues holding items that need to be run periodically.
hook_cron_queue_info_alter core/modules/system/system.api.php Alter cron queue information before cron runs.
hook_css_alter core/modules/system/system.api.php Alter CSS files before they are output on the page.
hook_custom_theme core/modules/system/system.api.php Return the machine-readable name of the theme to use for the current page.
hook_dashboard_regions core/modules/dashboard/dashboard.api.php Add regions to the dashboard.
hook_dashboard_regions_alter core/modules/dashboard/dashboard.api.php Alter dashboard regions provided by modules.
hook_date_formats core/modules/system/system.api.php Define additional date formats.
hook_date_formats_alter core/modules/system/system.api.php Alter date formats declared by another module.
hook_date_format_types core/modules/system/system.api.php Define additional date types.
hook_date_format_types_alter core/modules/system/system.api.php Modify existing date types.
hook_delete core/modules/node/node.api.php Respond to node deletion.
hook_disable core/modules/system/system.api.php Perform necessary actions before module is disabled.
hook_drupal_goto_alter core/modules/system/system.api.php Change the page the user is sent to by drupal_goto().
hook_element_info core/modules/system/system.api.php Allows modules to declare their own Form API element types and specify their default values.
hook_element_info_alter core/modules/system/system.api.php Alter the element type information returned from modules.
hook_enable core/modules/system/system.api.php Perform necessary actions after module is enabled.
hook_entity_delete core/modules/system/system.api.php Act on entities when deleted.
hook_entity_info core/modules/system/system.api.php Inform the base system and the Field API about one or more entity types.
hook_entity_info_alter core/modules/system/system.api.php Alter the entity info.
hook_entity_insert core/modules/system/system.api.php Act on entities when inserted.
hook_entity_load core/modules/system/system.api.php Act on entities when loaded.
hook_entity_prepare_view core/modules/system/system.api.php Act on entities as they are being prepared for view.
hook_entity_presave core/modules/system/system.api.php Act on an entity before it is about to be created or updated.
hook_entity_query_alter core/modules/system/system.api.php Alter or execute an EntityFieldQuery.
hook_entity_update core/modules/system/system.api.php Act on entities when updated.
hook_entity_view core/modules/system/system.api.php Act on entities being assembled before rendering.
hook_entity_view_alter core/modules/system/system.api.php Alter the results of ENTITY_view().
hook_entity_view_mode_alter core/modules/system/system.api.php Change the view mode of an entity that is being displayed.
hook_exit core/modules/system/system.api.php Perform cleanup tasks.
hook_field_access core/modules/field/field.api.php Determine whether the user has access to a given field.
hook_field_attach_create_bundle core/modules/field/field.api.php Act on field_attach_create_bundle().
hook_field_attach_delete core/modules/field/field.api.php Act on field_attach_delete().
hook_field_attach_delete_bundle core/modules/field/field.api.php Act on field_attach_delete_bundle.
hook_field_attach_delete_revision core/modules/field/field.api.php Act on field_attach_delete_revision().
hook_field_attach_form core/modules/field/field.api.php Act on field_attach_form().
hook_field_attach_insert core/modules/field/field.api.php Act on field_attach_insert().
hook_field_attach_load core/modules/field/field.api.php Act on field_attach_load().
hook_field_attach_prepare_translation_alter core/modules/field/field.api.php Perform alterations on field_attach_prepare_translation().
hook_field_attach_preprocess_alter core/modules/field/field.api.php Alter field_attach_preprocess() variables.
hook_field_attach_presave core/modules/field/field.api.php Act on field_attach_presave().
hook_field_attach_purge core/modules/field/field.api.php Act on field_purge_data().
hook_field_attach_rename_bundle core/modules/field/field.api.php Act on field_attach_rename_bundle().
hook_field_attach_submit core/modules/field/field.api.php Act on field_attach_submit().
hook_field_attach_update core/modules/field/field.api.php Act on field_attach_update().
hook_field_attach_validate core/modules/field/field.api.php Act on field_attach_validate().
hook_field_attach_view_alter core/modules/field/field.api.php Perform alterations on field_attach_view() or field_view_field().
hook_field_available_languages_alter core/modules/field/field.api.php Alter field_available_languages() values.
hook_field_create_field core/modules/field/field.api.php Act on a field being created.
hook_field_create_instance core/modules/field/field.api.php Act on a field instance being created.
hook_field_delete core/modules/field/field.api.php Define custom delete behavior for this module's field data.
hook_field_delete_field core/modules/field/field.api.php Act on a field being deleted.
hook_field_delete_instance core/modules/field/field.api.php Act on a field instance being deleted.
hook_field_delete_revision core/modules/field/field.api.php Define custom revision delete behavior for this module's field types.
hook_field_display_alter core/modules/field/field.api.php Alters the display settings of a field before it gets displayed.
hook_field_display_ENTITY_TYPE_alter core/modules/field/field.api.php Alters the display settings of a field on a given entity type before it gets displayed.
hook_field_extra_fields core/modules/field/field.api.php Exposes "pseudo-field" components on fieldable entities.
hook_field_extra_fields_alter core/modules/field/field.api.php Alter "pseudo-field" components on fieldable entities.
hook_field_extra_fields_display_alter core/modules/field/field.api.php Alters the display settings of pseudo-fields before an entity is displayed.
hook_field_formatter_info core/modules/field/field.api.php Expose Field API formatter types.
hook_field_formatter_info_alter core/modules/field/field.api.php Perform alterations on Field API formatter types.
hook_field_formatter_prepare_view core/modules/field/field.api.php Allow formatters to load information for field values being displayed.
hook_field_formatter_view core/modules/field/field.api.php Build a renderable array for a field value.
hook_field_info core/modules/field/field.api.php Define Field API field types.
hook_field_info_alter core/modules/field/field.api.php Perform alterations on Field API field types.
hook_field_info_max_weight core/modules/field/field.api.php Returns the maximum weight for the entity components handled by the module.
hook_field_insert core/modules/field/field.api.php Define custom insert behavior for this module's field data.
hook_field_is_empty core/modules/field/field.api.php Define what constitutes an empty item for a field type.
hook_field_language_alter core/modules/field/field.api.php Perform alterations on field_language() values.
hook_field_load core/modules/field/field.api.php Define custom load behavior for this module's field types.
hook_field_prepare_translation core/modules/field/field.api.php Define custom prepare_translation behavior for this module's field types.
hook_field_prepare_view core/modules/field/field.api.php Prepare field values prior to display.
hook_field_presave core/modules/field/field.api.php Define custom presave behavior for this module's field types.
hook_field_purge_field core/modules/field/field.api.php Acts when a field record is being purged.
hook_field_purge_instance core/modules/field/field.api.php Acts when a field instance is being purged.
hook_field_read_field core/modules/field/field.api.php Act on field records being read from the database.
hook_field_read_instance core/modules/field/field.api.php Act on a field record being read from the database.
hook_field_schema core/modules/field/field.api.php Define the Field API schema for a field structure.
hook_field_storage_create_field core/modules/field/field.api.php Act on creation of a new field.
hook_field_storage_delete core/modules/field/field.api.php Delete all field data for an entity.
hook_field_storage_delete_field core/modules/field/field.api.php Act on deletion of a field.
hook_field_storage_delete_instance core/modules/field/field.api.php Act on deletion of a field instance.
hook_field_storage_delete_revision core/modules/field/field.api.php Delete a single revision of field data for an entity.
hook_field_storage_details core/modules/field/field.api.php Reveal the internal details about the storage for a field.
hook_field_storage_details_alter core/modules/field/field.api.php Perform alterations on Field API storage details.
hook_field_storage_info core/modules/field/field.api.php Expose Field API storage backends.
hook_field_storage_info_alter core/modules/field/field.api.php Perform alterations on Field API storage types.
hook_field_storage_load core/modules/field/field.api.php Load field data for a set of entities.
hook_field_storage_pre_insert core/modules/field/field.api.php Act before the storage backends insert field data.
hook_field_storage_pre_load core/modules/field/field.api.php Act before the storage backends load field data.
hook_field_storage_pre_update core/modules/field/field.api.php Act before the storage backends update field data.
hook_field_storage_purge core/modules/field/field.api.php Remove field storage information when field data is purged.
hook_field_storage_purge_field core/modules/field/field.api.php Remove field storage information when a field record is purged.
hook_field_storage_purge_field_instance core/modules/field/field.api.php Remove field storage information when a field instance is purged.
hook_field_storage_query core/modules/field/field.api.php Execute an EntityFieldQuery.
hook_field_storage_update_field core/modules/field/field.api.php Update the storage information for a field.
hook_field_storage_write core/modules/field/field.api.php Write field data for an entity.
hook_field_update core/modules/field/field.api.php Define custom update behavior for this module's field data.
hook_field_update_field core/modules/field/field.api.php Act on a field being updated.
hook_field_update_forbid core/modules/field/field.api.php Forbid a field update from occurring.
hook_field_update_instance core/modules/field/field.api.php Act on a field instance being updated.
hook_field_validate core/modules/field/field.api.php Validate this module's field data.
hook_field_widget_error core/modules/field/field.api.php Flag a field-level validation error.
hook_field_widget_form core/modules/field/field.api.php Return the form for a single field widget.
hook_field_widget_form_alter core/modules/field/field.api.php Alter forms for field widgets provided by other modules.
hook_field_widget_info core/modules/field/field.api.php Expose Field API widget types.
hook_field_widget_info_alter core/modules/field/field.api.php Perform alterations on Field API widget types.
hook_field_widget_properties_alter core/modules/field/field.api.php Alters the widget properties of a field instance before it gets displayed.
hook_field_widget_properties_ENTITY_TYPE_alter core/modules/field/field.api.php Alters the widget properties of a field instance on a given entity type before it gets displayed.
hook_field_widget_WIDGET_TYPE_form_alter core/modules/field/field.api.php Alter widget forms for a specific widget provided by another module.
hook_filetransfer_info core/modules/system/system.api.php Register information about FileTransfer classes provided by a module.
hook_filetransfer_info_alter core/modules/system/system.api.php Alter the FileTransfer class registry.
hook_file_copy core/modules/system/system.api.php Respond to a file that has been copied.
hook_file_delete core/modules/system/system.api.php Respond to a file being deleted.
hook_file_download core/modules/system/system.api.php Control access to private file downloads and specify HTTP headers.
hook_file_insert core/modules/system/system.api.php Respond to a file being added.
hook_file_load core/modules/system/system.api.php Load additional information into file objects.
hook_file_mimetype_mapping_alter core/modules/system/system.api.php Alter MIME type mappings used to determine MIME type from a file extension.
hook_file_move core/modules/system/system.api.php Respond to a file that has been moved.
hook_file_presave core/modules/system/system.api.php Act on a file being inserted or updated.
hook_file_update core/modules/system/system.api.php Respond to a file being updated.
hook_file_url_alter core/modules/system/system.api.php Alter the URL to a file.
hook_file_validate core/modules/system/system.api.php Check that files meet a given criteria.
hook_filter_format_disable core/modules/filter/filter.api.php Perform actions when a text format has been disabled.
hook_filter_format_insert core/modules/filter/filter.api.php Perform actions when a new text format has been created.
hook_filter_format_update core/modules/filter/filter.api.php Perform actions when a text format has been updated.
hook_filter_info core/modules/filter/filter.api.php Define content filters.
hook_filter_info_alter core/modules/filter/filter.api.php Perform alterations on filter definitions.
hook_flush_caches core/modules/system/system.api.php Add a list of cache tables to be cleared.
hook_form core/modules/node/node.api.php Display a node editing form.
hook_forms core/modules/system/system.api.php Map form_ids to form builder functions.
hook_form_alter core/modules/system/system.api.php Perform alterations before a form is rendered.
hook_form_BASE_FORM_ID_alter core/modules/system/system.api.php Provide a form-specific alteration for shared ('base') forms.
hook_form_FORM_ID_alter core/modules/system/system.api.php Provide a form-specific alteration instead of the global hook_form_alter().
hook_help core/modules/system/system.api.php Provide online user help.
hook_hook_info core/modules/system/system.api.php Defines one or more hooks that are exposed by a module.
hook_hook_info_alter core/modules/system/system.api.php Alter information from hook_hook_info().
hook_html_head_alter core/modules/system/system.api.php Alter XHTML HEAD tags before they are rendered by drupal_get_html_head().
hook_image_default_styles core/modules/image/image.api.php Provide module-based image styles for reuse throughout Drupal.
hook_image_effect_info core/modules/image/image.api.php Define information about image effects provided by a module.
hook_image_effect_info_alter core/modules/image/image.api.php Alter the information provided in hook_image_effect_info().
hook_image_styles_alter core/modules/image/image.api.php Modify any image styles provided by other modules or the user.
hook_image_style_delete core/modules/image/image.api.php Respond to image style deletion.
hook_image_style_flush core/modules/image/image.api.php Respond to image style flushing.
hook_image_style_save core/modules/image/image.api.php Respond to image style updating.
hook_image_toolkits core/modules/system/system.api.php Define image toolkits provided by this module.
hook_init core/modules/system/system.api.php Perform setup tasks for non-cached page requests.
hook_insert core/modules/node/node.api.php Respond to creation of a new node.
hook_install core/modules/system/system.api.php Perform setup tasks when the module is installed.
hook_install_tasks core/modules/system/system.api.php Return an array of tasks to be performed by an installation profile.
hook_install_tasks_alter core/modules/system/system.api.php Alter the full list of installation tasks.
hook_js_alter core/modules/system/system.api.php Perform necessary alterations to the JavaScript before it is presented on the page.
hook_language_fallback_candidates_alter core/modules/system/language.api.php Perform alterations on the language fallback candidates.
hook_language_init core/modules/system/language.api.php Allows modules to act after language initialization has been performed.
hook_language_negotiation_info core/modules/system/language.api.php Define language negotiation providers.
hook_language_negotiation_info_alter core/modules/system/language.api.php Perform alterations on language negoiation providers.
hook_language_switch_links_alter core/modules/system/language.api.php Perform alterations on language switcher links.
hook_language_types_info core/modules/system/language.api.php Define language types.
hook_language_types_info_alter core/modules/system/language.api.php Perform alterations on language types.
hook_library core/modules/system/system.api.php Registers JavaScript/CSS libraries associated with a module.
hook_library_alter core/modules/system/system.api.php Alters the JavaScript/CSS library registry.
hook_load core/modules/node/node.api.php Act on nodes being loaded from the database.
hook_locale core/modules/locale/locale.api.php Allows modules to define their own text groups that can be translated.
hook_mail core/modules/system/system.api.php Prepare a message based on parameters; called from drupal_mail().
hook_mail_alter core/modules/system/system.api.php Alter an email message created with the drupal_mail() function.
hook_menu core/modules/system/system.api.php Define menu items and page callbacks.
hook_menu_alter core/modules/system/system.api.php Alter the data being saved to the {menu_router} table after hook_menu is invoked.
hook_menu_breadcrumb_alter core/modules/system/system.api.php Alter links in the active trail before it is rendered as the breadcrumb.
hook_menu_contextual_links_alter core/modules/system/system.api.php Alter contextual links before they are rendered.
hook_menu_delete core/modules/menu/menu.api.php Respond to a custom menu deletion.
hook_menu_get_item_alter core/modules/system/system.api.php Alter a menu router item right after it has been retrieved from the database or cache.
hook_menu_insert core/modules/menu/menu.api.php Respond to a custom menu creation.
hook_menu_link_alter core/modules/system/system.api.php Alter the data being saved to the {menu_links} table by menu_link_save().
hook_menu_link_delete core/modules/system/system.api.php Inform modules that a menu link has been deleted.
hook_menu_link_insert core/modules/system/system.api.php Inform modules that a menu link has been created.
hook_menu_link_update core/modules/system/system.api.php Inform modules that a menu link has been updated.
hook_menu_local_tasks_alter core/modules/system/system.api.php Alter tabs and actions displayed on the page before they are rendered.
hook_menu_site_status_alter core/modules/system/system.api.php Control site status before menu dispatching.
hook_menu_update core/modules/menu/menu.api.php Respond to a custom menu update.
hook_modules_disabled core/modules/system/system.api.php Perform necessary actions after modules are disabled.
hook_modules_enabled core/modules/system/system.api.php Perform necessary actions after modules are enabled.
hook_modules_installed core/modules/system/system.api.php Perform necessary actions after modules are installed.
hook_modules_uninstalled core/modules/system/system.api.php Perform necessary actions after modules are uninstalled.
hook_module_implements_alter core/modules/system/system.api.php Alter the registry of modules implementing a hook.
hook_multilingual_settings_changed core/modules/locale/locale.api.php Allow modules to react to language settings changes.
hook_node_access core/modules/node/node.api.php Control access to a node.
hook_node_access_records core/modules/node/node.api.php Set permissions for a node to be written to the database.
hook_node_access_records_alter core/modules/node/node.api.php Alter permissions for a node before it is written to the database.
hook_node_delete core/modules/node/node.api.php Respond to node deletion.
hook_node_grants core/modules/node/node.api.php Inform the node access system what permissions the user has.
hook_node_grants_alter core/modules/node/node.api.php Alter user access rules when trying to view, edit or delete a node.
hook_node_info core/modules/node/node.api.php Define module-provided node types.
hook_node_insert core/modules/node/node.api.php Respond to creation of a new node.
hook_node_load core/modules/node/node.api.php Act on arbitrary nodes being loaded from the database.
hook_node_operations core/modules/node/node.api.php Add mass node operations.
hook_node_prepare core/modules/node/node.api.php Act on a node object about to be shown on the add/edit form.
hook_node_presave core/modules/node/node.api.php Act on a node being inserted or updated.
hook_node_revision_delete core/modules/node/node.api.php Respond to deletion of a node revision.
hook_node_search_result core/modules/node/node.api.php Act on a node being displayed as a search result.
hook_node_submit core/modules/node/node.api.php Act on a node after validated form values have been copied to it.
hook_node_type_delete core/modules/node/node.api.php Respond to node type deletion.
hook_node_type_insert core/modules/node/node.api.php Respond to node type creation.
hook_node_type_update core/modules/node/node.api.php Respond to node type updates.
hook_node_update core/modules/node/node.api.php Respond to updates to a node.
hook_node_update_index core/modules/node/node.api.php Act on a node being indexed for searching.
hook_node_validate core/modules/node/node.api.php Perform node validation before a node is created or updated.
hook_node_view core/modules/node/node.api.php Act on a node that is being assembled before rendering.
hook_node_view_alter core/modules/node/node.api.php Alter the results of node_view().
hook_openid core/modules/openid/openid.api.php Allow modules to modify the OpenID request parameters.
hook_openid_discovery_method_info core/modules/openid/openid.api.php Allow modules to declare OpenID discovery methods.
hook_openid_discovery_method_info_alter core/modules/openid/openid.api.php Allow modules to alter discovery methods.
hook_openid_normalization_method_info core/modules/openid/openid.api.php Allow modules to declare OpenID normalization methods.
hook_openid_normalization_method_info_alter core/modules/openid/openid.api.php Allow modules to alter normalization methods.
hook_openid_response core/modules/openid/openid.api.php Allow modules to act upon a successful OpenID login.
hook_overlay_child_initialize core/modules/overlay/overlay.api.php Allow modules to act when an overlay child window is initialized.
hook_overlay_parent_initialize core/modules/overlay/overlay.api.php Allow modules to act when an overlay parent window is initialized.
hook_page_alter core/modules/system/system.api.php Perform alterations before a page is rendered.
hook_page_build core/modules/system/system.api.php Add elements to a page before it is rendered.
hook_page_delivery_callback_alter core/modules/system/system.api.php Alters the delivery callback used to send the result of the page callback to the browser.
hook_path_delete core/modules/path/path.api.php Respond to a path being deleted.
hook_path_insert core/modules/path/path.api.php Respond to a path being inserted.
hook_path_update core/modules/path/path.api.php Respond to a path being updated.
hook_permission core/modules/system/system.api.php Define user permissions.
hook_prepare core/modules/node/node.api.php Act on a node object about to be shown on the add/edit form.
hook_query_alter core/modules/system/system.api.php Perform alterations to a structured query.
hook_query_TAG_alter core/modules/system/system.api.php Perform alterations to a structured query for a given tag.
hook_ranking core/modules/node/node.api.php Provide additional methods of scoring for core search results for nodes.
hook_rdf_mapping core/modules/rdf/rdf.api.php Allow modules to define RDF mappings for field bundles.
hook_rdf_namespaces core/modules/rdf/rdf.api.php Allow modules to define namespaces for RDF mappings.
hook_registry_files_alter core/modules/system/system.api.php Perform necessary alterations to the list of files parsed by the registry.
hook_requirements core/modules/system/system.api.php Check installation requirements and do status reporting.
hook_schema core/modules/system/system.api.php Define the current version of the database schema.
hook_schema_alter core/modules/system/system.api.php Perform alterations to existing database schemas.
hook_search_access core/modules/search/search.api.php Define access to a custom search routine.
hook_search_admin core/modules/search/search.api.php Add elements to the search settings form.
hook_search_execute core/modules/search/search.api.php Execute a search for a set of key words.
hook_search_info core/modules/search/search.api.php Define a custom search type.
hook_search_page core/modules/search/search.api.php Override the rendering of search results.
hook_search_preprocess core/modules/search/search.api.php Preprocess text for search.
hook_search_reset core/modules/search/search.api.php Take action when the search index is going to be rebuilt.
hook_search_status core/modules/search/search.api.php Report the status of indexing.
hook_shortcut_default_set core/modules/shortcut/shortcut.api.php Return the name of a default shortcut set for the provided user account.
hook_simpletest_alter core/modules/simpletest/simpletest.api.php Alter the list of tests.
hook_stream_wrappers core/modules/system/system.api.php Registers PHP stream wrapper implementations associated with a module.
hook_stream_wrappers_alter core/modules/system/system.api.php Alters the list of PHP stream wrapper implementations.
hook_system_info_alter core/modules/system/system.api.php Alter the information parsed from module and theme .info files
hook_system_themes_page_alter core/modules/system/system.api.php Alters theme operation links.
hook_system_theme_info core/modules/system/system.api.php Return additional themes provided by modules.
hook_taxonomy_term_delete core/modules/taxonomy/taxonomy.api.php Respond to the deletion of taxonomy terms.
hook_taxonomy_term_insert core/modules/taxonomy/taxonomy.api.php Act on taxonomy terms when inserted.
hook_taxonomy_term_load core/modules/taxonomy/taxonomy.api.php Act on taxonomy terms when loaded.
hook_taxonomy_term_presave core/modules/taxonomy/taxonomy.api.php Act on taxonomy terms before they are saved.
hook_taxonomy_term_update core/modules/taxonomy/taxonomy.api.php Act on taxonomy terms when updated.
hook_taxonomy_term_view core/modules/taxonomy/taxonomy.api.php Act on a taxonomy term that is being assembled before rendering.
hook_taxonomy_term_view_alter core/modules/taxonomy/taxonomy.api.php Alter the results of taxonomy_term_view().
hook_taxonomy_vocabulary_delete core/modules/taxonomy/taxonomy.api.php Respond to the deletion of taxonomy vocabularies.
hook_taxonomy_vocabulary_insert core/modules/taxonomy/taxonomy.api.php Act on taxonomy vocabularies when inserted.
hook_taxonomy_vocabulary_load core/modules/taxonomy/taxonomy.api.php Act on taxonomy vocabularies when loaded.
hook_taxonomy_vocabulary_presave core/modules/taxonomy/taxonomy.api.php Act on taxonomy vocabularies before they are saved.
hook_taxonomy_vocabulary_update core/modules/taxonomy/taxonomy.api.php Act on taxonomy vocabularies when updated.
hook_test_finished core/modules/simpletest/simpletest.api.php An individual test has finished.
hook_test_group_finished core/modules/simpletest/simpletest.api.php A test group has finished.
hook_test_group_started core/modules/simpletest/simpletest.api.php A test group has started.
hook_theme core/modules/system/system.api.php Register a module (or theme's) theme implementations.
hook_theme_registry_alter core/modules/system/system.api.php Alter the theme registry information returned from hook_theme().
hook_tokens core/modules/system/system.api.php Provide replacement values for placeholder tokens.
hook_tokens_alter core/modules/system/system.api.php Alter replacement values for placeholder tokens.
hook_token_info core/modules/system/system.api.php Provide information about available placeholder tokens and token types.
hook_token_info_alter core/modules/system/system.api.php Alter the metadata about available placeholder tokens and token types.
hook_translated_menu_link_alter core/modules/system/system.api.php Alter a menu link after it has been translated and before it is rendered.
hook_trigger_info core/modules/trigger/trigger.api.php Declare triggers (events) for users to assign actions to.
hook_trigger_info_alter core/modules/trigger/trigger.api.php Alter triggers declared by hook_trigger_info().
hook_uninstall core/modules/system/system.api.php Remove any information that the module sets.
hook_update core/modules/node/node.api.php Respond to updates to a node.
hook_updater_info core/modules/system/system.api.php Provide information on Updaters (classes that can update Drupal).
hook_updater_info_alter core/modules/system/system.api.php Alter the Updater information array.
hook_update_dependencies core/modules/system/system.api.php Return an array of information about module update dependencies.
hook_update_index core/modules/search/search.api.php Update the search index for this module.
hook_update_last_removed core/modules/system/system.api.php Return a number which is no longer available as hook_update_N().
hook_update_N core/modules/system/system.api.php Perform a single update.
hook_update_projects_alter core/modules/update/update.api.php Alter the list of projects before fetching data and comparing versions.
hook_update_status_alter core/modules/update/update.api.php Alter the information about available updates for projects.
hook_url_inbound_alter core/modules/system/system.api.php Alters inbound URL requests.
hook_url_outbound_alter core/modules/system/system.api.php Alters outbound URLs.
hook_username_alter core/modules/system/system.api.php Alter the username that is displayed for a user.
hook_user_cancel core/modules/user/user.api.php Act on user account cancellations.
hook_user_cancel_methods_alter core/modules/user/user.api.php Modify account cancellation methods.
hook_user_categories core/modules/user/user.api.php Define a list of user settings or profile information categories.
hook_user_delete core/modules/user/user.api.php Respond to user deletion.
hook_user_insert core/modules/user/user.api.php A user account was created.
hook_user_load core/modules/user/user.api.php Act on user objects when loaded from the database.
hook_user_login core/modules/user/user.api.php The user just logged in.
hook_user_logout core/modules/user/user.api.php The user just logged out.
hook_user_operations core/modules/user/user.api.php Add mass user operations.
hook_user_presave core/modules/user/user.api.php A user account is about to be created or updated.
hook_user_role_delete core/modules/user/user.api.php Respond to user role deletion.
hook_user_role_insert core/modules/user/user.api.php Respond to creation of a new user role.
hook_user_role_presave core/modules/user/user.api.php Act on a user role being inserted or updated.
hook_user_role_update core/modules/user/user.api.php Respond to updates to a user role.
hook_user_update core/modules/user/user.api.php A user account was updated.
hook_user_view core/modules/user/user.api.php The user's account information is being displayed.
hook_user_view_alter core/modules/user/user.api.php The user was built; the module may modify the structured content.
hook_validate core/modules/node/node.api.php Perform node validation before a node is created or updated.
hook_verify_update_archive core/modules/update/update.api.php Verify an archive after it has been downloaded and extracted.
hook_view core/modules/node/node.api.php Display a node.
hook_watchdog core/modules/system/system.api.php Log an event message.
hook_xmlrpc core/modules/system/system.api.php Register XML-RPC callbacks.
hook_xmlrpc_alter core/modules/system/system.api.php Alters the definition of XML-RPC methods before they are called.
module_hook core/includes/module.inc Determines whether a module implements a hook.
module_hook_info core/includes/module.inc Retrieves a list of hooks that are declared through hook_hook_info().
module_implements core/includes/module.inc Determines which modules are implementing a hook.
module_implements_write_cache core/includes/module.inc Writes the hook implementation cache.
module_invoke core/includes/module.inc Invokes a hook in a particular module.
module_invoke_all core/includes/module.inc Invokes a hook in all enabled modules that implement it.

Sub-Topics

Namesort descending Location Description
Callbacks core/includes/module.inc Callback function signatures.
Field Formatter API core/modules/field/field.api.php Define Field API formatter types.
Field Types API core/modules/field/field.api.php Define field types.
Field Widget API core/modules/field/field.api.php Define Field API widget types.