Drupal 9

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Namesort descending Description
Actions Functions that perform an action on a certain system object.
Ajax framework Functions for Drupal's Ajax framework.
Ajax framework commands Functions to create various Ajax commands.
Authorized operations Functions to run operations with elevated privileges via authorize.php.
Batch operations Creates and processes batch operations.
Block Caching Constants that define each block's caching state.
Configuration system hooks @todo Overall description of the configuration system.
Content markers Markers used by theme_mark() and node_mark() to designate content.
Database abstraction layer Allow the use of different database servers using the same code base.
Default theme implementations Functions and templates for the user interface to be implemented by themes.
Field API Attaches custom data fields to Drupal entities.
Field API bulk data deletion Cleans up after Field API bulk deletion operations.
Field Attach API Operates on Field API data attached to Drupal entities.
Field CRUD API Creates, updates, and deletes Field API fields, bundles, and instances.
Field Formatter API Define Field API formatter types.
Field Info API Obtains information about Field API configuration.
Field Language API Handles multilingual fields.
Field Storage API Implements a storage engine for Field API data.
Field Types API Defines field, widget, display formatter, and storage types.
Field Widget API Define Field API widget types.
File interface Common file handling functions.
File module public API functions These functions may be used to determine if and where a file is in use.
Form builder functions Functions that build an abstract representation of a HTML form.
Form generation Functions to enable the processing and display of HTML forms.
Formatting Functions to format numbers, strings, dates, etc.
Hook implementations for user-created content types Functions that implement hooks for user-created content types.
Hooks Allow modules to interact with the Drupal core.
HTTP handling Functions to properly handle HTTP responses.
Image toolkits Functions for image file manipulations.
Input validation Functions to validate user input.
Interface translation properties .info file properties for interface translation settings.
Language Negotiation API functionality Functions to customize the language types and the negotiation process.
Locking mechanisms Functions to coordinate long-running operations across requests.
Logging severity levels Logging severity levels as defined in RFC 3164.
Menu context types Flags for use in the "context" attribute of menu router items.
Menu flags Flags for use in the "type" attribute of menu items.
Menu item types Definitions for various menu item types.
Menu status codes Status codes for menu callbacks.
Menu system Define the navigation menus, and route page requests to code based on URLs.
Menu tree parameters Parameters for a menu tree.
Node access rights The node access system determines who can do what to which nodes.
Node API Hooks Functions to define and modify content types.
Objects that represent a View or part of a view These objects are the core of Views do the bulk of the direction and storing of data. All database activity is in these objects.
PHP wrapper functions Functions that are wrappers or custom implementations of PHP functions.
Private update status cache system Functions to manage the update status cache.
Queue operations Queue items to allow later processing.
RDF Mapping API Functions to describe entities and bundles in RDF.
Sanitization functions Functions to sanitize values.
Schema API API to handle database schemas.
Search interface The Drupal search interface manages a global search mechanism.

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