Hook Functions

Name	Description
hook_access($op, $node, $account)	Define access restrictions.
hook_actions_delete()	Execute code after an action is deleted.
hook_auth	Verify authentication of a user.
hook_block($op='list', $delta=0, $edit=array())	Declare a block or set of blocks.
hook_boot()	Perform setup tasks. See also, hook_init.
hook_comment	Act on comments.
hook_cron	Perform periodic actions.
hook_db_rewrite_sql($query, $primary_table, $primary_field, $args)	Add JOIN and WHERE statements to queries and decide whether the primary_field shall be made DISTINCT. For node objects, primary field is always called nid. For taxonomy terms, it is tid and for vocabularies it is vid. For comments, it is cid. Primary...
hook_delete	Respond to node deletion.
hook_disable()	Perform necessary actions before module is disabled.
hook_elements	Allows modules to declare their own form element types and specify their default values.
hook_enable()	Perform necessary actions after module is enabled.
hook_exit($destination=NULL)	Perform cleanup tasks.
hook_file_download($file)	Allow file downloads.
hook_filter($op, $delta=0, $format=-1, $text='')	Define content filters.
hook_filter_tips($delta, $format, $long=false)	Provide tips for using filters.
hook_flush_caches()	Add a list of cache tables to be cleared.
hook_footer($main=0)	Insert closing HTML.
hook_form(&$node,&$param)	Display a node editing form.
hook_forms()	Map form_ids to builder functions.
hook_form_alter(&$form,$form_state,$form_id)	Perform alterations before a form is rendered. One popular use of this hook is to add form elements to the node form.
hook_help($path, $arg)	Provide online user help.
hook_info	Declare authentication scheme information.
hook_init	Perform setup tasks.
hook_insert($node)	Respond to node insertion.
hook_install	Install the current version of the database schema.
hook_link($type, $object, $teaser=FALSE)	Define internal Drupal links.
hook_link_alter(&$links, $node)	Perform alterations before links on a node are rendered. One popular use of this hook is to add/delete links from other modules.
hook_load($node)	Load node-type-specific information.
hook_mail($key, &$message, $params)	Prepare a message based on parameters. See drupal_mail for more.
hook_mail_alter(&$message)	Alter any aspect of the emails sent by Drupal.
hook_menu	Define menu items and page callbacks.
hook_menu_alter(&$callbacks)	Alter the data being saved to the {menu_router} table after hook_menu is invoked.
hook_menu_link_alter(&$item, $menu)	Alter the data being saved to the {menu_links} table by menu_link_save().
hook_nodeapi(&$node, $op, $a3=NULL, $a4=NULL)	Act on nodes defined by other modules.
hook_node_grants($account, $op)	Grant access to nodes.
hook_node_info	Define the human-readable name of a node type.
hook_node_operations()	Add mass node operations.
hook_node_type($op, $info)	Act on node type changes.
hook_perm	Define user permissions.
hook_ping($name='', $url='')	Ping another server.
hook_prepare(&$node)	This is a hook used by node modules. It is called after load but before the node is shown on the add/edit form.
hook_profile_alter(&$fields, $account)	Perform alterations profile items before they are rendered. You may omit/add/re-sort/recategorize, etc.
hook_requirements($phase)	Check installation requirements and do status reporting.
hook_schema()	Define the current version of the database schema.
hook_search($op='search', $keys=null)	Define a custom search routine.
hook_search_item($item)	Format a search result.
hook_search_preprocess($text)	Preprocess text for the search index.
hook_submit(&$node)	This is a hook used by node modules. It is called after validation has succeeded and before insert/update. It is used to for actions which must happen only if the node is to be saved.
hook_settings	Declare administrative settings for a module.
hook_system_info_alter()	Alert the information parsed from modules and theme .info files
hook_taxonomy($op, $type, $array=NULL)	Act on taxonomy changes.
hook_term_path()	Allows modules to provide an alternative path for the terms it manages.
hook_theme()	Register a module’s (or theme’s) theme implementations.
hook_theme_registry_alter()	Alter the theme registry information returned from hook_theme().
hook_translated_menu_link_alter()	Alter a menu link after it's translated, but before it's rendered.
hook_uninstall()	Remove any tables or variables that the module sets.
hook_update($node)	Respond to node updating.
hook_update_index	Update Drupal's full-text index for this module.
hook_update_N	Perform a single update. For each patch which requires a database change add a new hook_update_N() which will be called by update.php.
hook_user($op,&$edit,&$account, $category= ULL)	Act on user account actions.
hook_user_operations()	Add mass user operations.
hook_validate($node)	Verify a node editing form.
hook_view($node, $teaser=FALSE, $page=FALSE)	Display a node.
hook_watchdog($log_msg)	Log an event message.
hook_xmlrpc	Register XML-RPC callbacks.
module_hook	Determine whether a module implements a hook.
module_implements	Determine which modules are implementing a hook.
module_invoke	Invoke a hook in a particular module.
module_invoke_all	Invoke a hook in all enabled modules that implement it.