Hook Examples

hook_form	modules/node/node.api.php	Display a node editing form
hook_form_alter	modules/system/system.api.php	Perform alterations before a form is rendered.
hook_menu	modules/system/system.api.php	Define menu items and page callbacks
hook_menu_alter	modules/system/system.api.php	Alter the data being saved to the {menu_router} table after hook_menu is invoked
hook_menu_delete	modules/menu/menu.api.php	Respond to a custom menu deletion.
hook_node_validate	modules/node/node.api.php	Perform node validation before a node is created or updated.
module_hook	includes/module.inc	Determines whether a module implements a hook.
hook_user_categories	modules/user/user.api.php	Retrieve a list of user setting or profile information categories.
hook_user_delete	modules/user/user.api.	php     Respond to user deletion.
hook_user_insert    .	modules/user/user.api.php	A user account was created
hook_user_load	modules/user/user.api.php	Act on user objects when loaded from the database.
hook_user_login	modules/user/user.api.php	The user just logged in.
hook_user_logout	modules/user/user.api.php	The user just logged out.