Drupal Hooks

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Hooks allow modules to interact with the Drupal core.

Module system of Drupal is based on the concept of "hooks". A hook is actually a PHP
function that is named modulename_hookname(), where "modulename" is the name of the module (whose
filename will be modulename.module) and "hookname" is the name of the hook. Every hook have
a defined set of parameters and a specified result type.

For extending Drupal, your module simply need to implement a hook. When Drupal wishes to
allow intervention from modules, it determines which modules implement a hook
and call that hook in all enabled modules that implement it.

The available hooks to implement are explained in the Hooks section of
the developer documentation of Drupal. The string "hook" is used as a placeholder for
the module name is 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().

Functions

Name	Location	Description
custom_url_rewrite_inbound	developer/hooks/core.php	custom_url_rewrite_inbound is not a hook, it's a function you can add to settings.php to alter incoming requests so they map to a Drupal path. This function is called before modules are loaded and the menu system is initialized and it changes...
custom_url_rewrite_outbound	developer/hooks/core.php	custom_url_rewrite_outbound is not a hook, it's a function you can add to settings.php to alter all links generated by Drupal. This function is called from url(). This function is called very frequently (100+ times per page) so performance...
hook_access	developer/hooks/node.php	Define access restrictions.
hook_actions_delete	developer/hooks/core.php	Execute code after an action is deleted.
hook_action_info	developer/hooks/core.php	Declare information about one or more Drupal actions.
hook_action_info_alter	developer/hooks/core.php	Alter the actions declared by another module.
hook_block	developer/hooks/core.php	Declare a block or set of blocks.
hook_boot	developer/hooks/core.php	Perform setup tasks. See also, hook_init.
hook_comment	developer/hooks/core.php	Act on comments.
hook_cron	developer/hooks/core.php	Perform periodic actions.
hook_db_rewrite_sql	developer/hooks/core.php	Rewrite database queries, usually for access control.
hook_delete	developer/hooks/node.php	Respond to node deletion.
hook_disable	developer/hooks/install.php	Perform necessary actions before module is disabled.
hook_elements	developer/hooks/core.php	Allows modules to declare their own Forms API element types and specify their default values.
hook_enable	developer/hooks/install.php	Perform necessary actions after module is enabled.
hook_exit	developer/hooks/core.php	Perform cleanup tasks.
hook_file_download	developer/hooks/core.php	Control access to private file downloads and specify HTTP headers.
hook_filter	developer/hooks/core.php	Define content filters.
hook_filter_tips	developer/hooks/core.php	Provide tips for using filters.
hook_flush_caches	developer/hooks/core.php	Add a list of cache tables to be cleared.
hook_footer	developer/hooks/core.php	Insert closing HTML.
hook_form	developer/hooks/node.php	Display a node editing form.
hook_forms	developer/hooks/core.php	Map form_ids to builder functions.
hook_form_alter	developer/hooks/core.php	Perform alterations before a form is rendered.
hook_form_FORM_ID_alter	developer/hooks/core.php	Provide a form-specific alteration instead of the global hook_form_alter().
hook_help	developer/hooks/core.php	Provide online user help.
hook_hook_info	developer/hooks/core.php	Expose a list of triggers (events) that your module is allowing users to assign actions to.
hook_init	developer/hooks/core.php	Perform setup tasks. See also, hook_boot.
hook_insert	developer/hooks/node.php	Respond to node insertion.
hook_install	developer/hooks/install.php	Install the current version of the database schema, and any other setup tasks.
hook_link	developer/hooks/core.php	Define internal Drupal links.
hook_link_alter	developer/hooks/core.php	Perform alterations before links on a node are rendered.
hook_load	developer/hooks/node.php	Load node-type-specific information.
hook_locale	developer/hooks/core.php	Allows modules to define their own text groups that can be translated.
hook_mail	developer/hooks/core.php	Prepare a message based on parameters. @see drupal_mail for more.
hook_mail_alter	developer/hooks/core.php	Alter any aspect of the emails sent by Drupal. You can use this hook to add a common site footer to all outgoing emails; add extra header fields and/or modify the mails sent out in any way. HTML-izing the outgoing mails is one possibility. See also...
hook_menu	developer/hooks/core.php	Define menu items and page callbacks.
hook_menu_alter	developer/hooks/core.php	Alter the data being saved to the {menu_router} table after hook_menu is invoked.
hook_menu_link_alter	developer/hooks/core.php	Alter the data being saved to the {menu_links} table by menu_link_save().
hook_nodeapi	developer/hooks/core.php	Act on nodes defined by other modules.
hook_node_access_records	developer/hooks/core.php	Set permissions for a node to be written to the database.
hook_node_grants	developer/hooks/core.php	Inform the node access system what permissions the user has.
hook_node_info	developer/hooks/node.php	Define module-provided node types.
hook_node_operations	developer/hooks/core.php	Add mass node operations.
hook_node_type	developer/hooks/node.php	Act on node type changes.
hook_perm	developer/hooks/core.php	Define user permissions.
hook_ping	developer/hooks/core.php	Ping another server.
hook_prepare	developer/hooks/node.php	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	developer/hooks/core.php	Perform alterations profile items before they are rendered. You may omit/add/re-sort/re-categorize, etc.
hook_requirements	developer/hooks/install.php	Check installation requirements and do status reporting.
hook_schema	developer/hooks/install.php	Define the current version of the database schema.
hook_schema_alter	developer/hooks/core.php	Perform alterations to existing database schemas.
hook_search	developer/hooks/core.php	Define a custom search routine.
hook_search_preprocess	developer/hooks/core.php	Preprocess text for the search index.
hook_system_info_alter	developer/hooks/core.php	Alter the information parsed from module and theme .info files
hook_taxonomy	developer/hooks/core.php	Act on taxonomy changes.
hook_term_path	developer/hooks/core.php	Allows modules to provide an alternative path for the terms it manages.
hook_theme	developer/hooks/core.php	Register a module (or theme's) theme implementations.
hook_theme_registry_alter	developer/hooks/core.php	Alter the theme registry information returned from hook_theme().
hook_translated_menu_link_alter	developer/hooks/core.php	Alter a menu link after it's translated, but before it's rendered.
hook_translation_link_alter	developer/hooks/core.php	Perform alterations on translation links.
hook_uninstall	developer/hooks/install.php	Remove any tables or variables that the module sets.
hook_update	developer/hooks/node.php	Respond to node updating.
hook_update_index	developer/hooks/core.php	Update Drupal's full-text index for this module.
hook_update_last_removed	developer/hooks/install.php	Return a number which is no longer available as hook_update_N().
hook_update_N	developer/hooks/install.php	Perform a single update.
hook_update_status_alter	developer/hooks/core.php	Alter the information about available updates for projects.
hook_user	developer/hooks/core.php	Act on user account actions.
hook_user_operations	developer/hooks/core.php	Add mass user operations.
hook_validate	developer/hooks/node.php	Verify a node editing form.
hook_view	developer/hooks/node.php	Display a node.
hook_watchdog	developer/hooks/core.php	Log an event message
hook_xmlrpc	developer/hooks/core.php	Register XML-RPC callbacks.
module_hook	includes/module.inc	Determine whether a module implements a hook.
module_implements	includes/module.inc	Determine which modules are implementing a hook.
module_invoke	includes/module.inc	Invoke a hook in a particular module.
module_invoke_all	includes/module.inc	Invoke a hook in all enabled modules that implement it.

The complete information is collected from Drupal site,you are highly requested to refer
http://api.drupal.org/api/group/hooks for a detail list of hooks available.

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