Drupal e-Commerce

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 call 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 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
hook_access	docs-4-7/hooks/node.php	Define access restrictions.
hook_block	docs-4-7/hooks/core.php	Declare a block or set of blocks.
hook_comment	docs-4-7/hooks/core.php	Act on comments.
hook_cron	docs-4-7/hooks/core.php	Perform periodic actions.
hook_db_rewrite_sql	docs-4-7/hooks/core.php	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	docs-4-7/hooks/node.php	Respond to node deletion.
hook_elements	docs-4-7/hooks/core.php	Allows modules to declare their own form element types and specify their default values.
hook_exit	docs-4-7/hooks/core.php	Perform cleanup tasks.
hook_file_download	docs-4-7/hooks/core.php	Allow file downloads.
hook_filter	docs-4-7/hooks/core.php	Define content filters.
hook_filter_tips	docs-4-7/hooks/core.php	Provide tips for using filters.
hook_footer	docs-4-7/hooks/core.php	Insert closing HTML.
hook_form	docs-4-7/hooks/node.php	Display a node editing form.
hook_form_alter	docs-4-7/hooks/core.php	Perform alterations before a form is rendered. One popular use of this hook is to add form elements to the node form.
hook_help	docs-4-7/hooks/core.php	Provide online user help.
hook_init	docs-4-7/hooks/core.php	Perform setup tasks.
hook_insert	docs-4-7/hooks/node.php	Respond to node insertion.
hook_link	docs-4-7/hooks/core.php	Define internal Drupal links.
hook_load	docs-4-7/hooks/node.php	Load node-type-specific information.
hook_menu	docs-4-7/hooks/core.php	Define menu items and page callbacks.
hook_nodeapi	docs-4-7/hooks/core.php	Act on nodes defined by other modules.
hook_node_grants	docs-4-7/hooks/core.php	Grant access to nodes.
hook_node_info	docs-4-7/hooks/node.php	Define the human-readable name of a node type.
hook_perm	docs-4-7/hooks/core.php	Define user permissions.
hook_ping	docs-4-7/hooks/core.php	Ping another server.
hook_prepare	docs-4-7/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_search	docs-4-7/hooks/core.php	Define a custom search routine.
hook_search_preprocess	docs-4-7/hooks/core.php	Preprocess text for the search index.
hook_settings	docs-4-7/hooks/core.php	Declare administrative settings for a module.
hook_submit	docs-4-7/hooks/node.php	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. Usually, $node is changed in some way and then the actual saving of...
hook_taxonomy	docs-4-7/hooks/core.php	Act on taxonomy changes.
hook_update	docs-4-7/hooks/node.php	Respond to node updating.
hook_update_index	docs-4-7/hooks/core.php	Update Drupal's full-text index for this module.
hook_user	docs-4-7/hooks/core.php	Act on user account actions.
hook_validate	docs-4-7/hooks/node.php	Verify a node editing form.
hook_view	docs-4-7/hooks/node.php	Display a node.
hook_xmlrpc	docs-4-7/hooks/core.php	Register XML-RPC callbacks.