| drupal/ modules/ file/ file.module | These functions may be used to determine if and where a file is in use. |
| Actions | drupal/ includes/ actions.inc | Functions that perform an action on a certain system object. |
| AJAX framework | drupal/ includes/ ajax.inc | Drupal's AJAX framework is used to dynamically update parts of a page's HTML
based on data from the server. Upon a specified event, such as a button
click, a callback function is triggered which performs server-side logic and
may return... |
| AJAX framework commands | drupal/ includes/ ajax.inc | |
| Authorized operations | drupal/ modules/ system/ system.module | Functions to run operations with elevated privileges via authorize.php. |
| Batch operations | drupal/ includes/ form.inc | Functions allowing forms processing to be spread out over several page
requests, thus ensuring that the processing does not get interrupted
because of a PHP timeout, while allowing the user to receive feedback
on the progress of the ongoing operations. |
| Code registry | drupal/ includes/ registry.inc | The code registry engine. |
| Database abstraction layer | drupal/ includes/ database/ database.inc | Allow the use of different database servers using the same code base. |
| Default theme implementations | drupal/ modules/ system/ theme.api.php | Functions and templates that present output to the user, and can be
implemented by themes. |
| Example batch definitions | contributions/ docs/ developer/ examples/ batch_example.module | Definitions of the batches used in this module. |
| Field API | drupal/ modules/ field/ field.module | Attach custom data fields to Drupal entities. |
| Field API bulk data deletion | drupal/ modules/ field/ field.crud.inc | Clean up after Field API bulk deletion operations. |
| Field API data structures | drupal/ modules/ field/ field.crud.inc | Represent Field API fields and instances. |
| Field Attach API | drupal/ modules/ field/ field.attach.inc | Operate on Field API data attached to Drupal entities. |
| Field CRUD API | drupal/ modules/ field/ field.crud.inc | Create, update, and delete Field API fields, bundles, and instances. |
| Field Info API | drupal/ modules/ field/ field.info.inc | Obtain information about Field API configuration. |
| Field Storage API | drupal/ modules/ field/ field.attach.inc | Implement a storage engine for Field API data. |
| Field Types API | drupal/ modules/ field/ field.api.php | Define field types, widget types, display formatter types, storage types. |
| File interface | drupal/ includes/ file.inc | Common file handling functions. |
| Form builder functions | drupal/ includes/ form.inc | Functions that build an abstract representation of a HTML form. |
| Form generation | drupal/ includes/ form.inc | Functions to enable the processing and display of HTML forms. |
| Formatting | drupal/ includes/ common.inc | Functions to format numbers, strings, dates, etc. |
| Functions to coordinate long-running operations across requests. | drupal/ includes/ lock.inc | In most environments, multiple Drupal page requests (a.k.a. threads or
processes) will execute in parallel. This leads to potential conflicts or
race conditions when two requests execute the same code at the same time. A
common example of this is a... |
| Hook implementations for user-created content types. | drupal/ modules/ node/ node.module | |
| Hooks | drupal/ includes/ module.inc | Allow modules to interact with the Drupal core. |
| Image toolkits | drupal/ includes/ image.inc | Drupal's image toolkits provide an abstraction layer for common image file
manipulations like scaling, cropping, and rotating. The abstraction frees
module authors from the need to support multiple image libraries, and it
allows site... |
| indexing Taxonomy functions maintaining {taxonomy_index}. | drupal/ modules/ taxonomy/ taxonomy.module | Taxonomy uses default field storage to store canonical relationships
between terms and fieldable entities. However its most common use case
requires listing all content associated with a term or group of terms
sorted by creation date. To avoid slow... |
| Input validation | drupal/ includes/ common.inc | Functions to validate user input. |
| Menu system | drupal/ includes/ menu.inc | Define the navigation menus, and route page requests to code based on URLs. |
| Node access rights | drupal/ modules/ node/ node.module | The node access system determines who can do what to which nodes. |
| Node API Hooks | drupal/ modules/ node/ node.api.php | The Node API allows modules to define content types, to modify content
types created in the user interface, and to modify content types created by
other modules. |
| PHP wrapper functions | drupal/ includes/ common.inc | Functions that are wrappers or custom implementations of PHP functions. |
| Private update status cache system | drupal/ modules/ update/ update.module | We specifically do NOT use the core cache API for saving the fetched data
about available updates. It is vitally important that this cache is only
cleared when we're populating it after successfully fetching new available
update data. Usage of... |
| Queue operations | drupal/ modules/ system/ system.queue.inc | The queue system allows placing items in a queue and processing them later.
The system tries to ensure that only one consumer can process an item. |
| RDF Mapping API | drupal/ modules/ rdf/ rdf.module | Functions to describe entities and bundles for RDFa. |
| Sanitization functions | drupal/ includes/ common.inc | Functions to sanitize values. |
| Schema API | drupal/ includes/ database/ schema.inc | A Drupal schema definition is an array structure representing one or
more tables and their related keys and indexes. A schema is defined by
hook_schema(), which usually lives in a modulename.install file. |
| Search interface | drupal/ modules/ search/ search.module | The Drupal search interface manages a global search mechanism. |
| Update manager file management functions. | drupal/ modules/ update/ update.manager.inc | |
| Update manager for installing new code. | drupal/ modules/ update/ update.manager.inc | |
| Update manager for updating existing code. | drupal/ modules/ update/ update.manager.inc | |
