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Introduction to classes

A lot of the PHP code in Drupal is object oriented (OO), making use of PHP classes, interfaces, and traits. See the Objected-oriented programming conventions for more information.

See also

Objected-oriented programming conventions

Namesort descending Type Namespace Location Description Direct uses Use statements Strings
AccountProxyTest class Drupal\Tests\Core\Session core/tests/Drupal/Tests/Core/Session/AccountProxyTest.php @coversDefaultClass \Drupal\Core\Session\AccountProxy @group Session
AccountSetEvent final class Drupal\Core\Session core/lib/Drupal/Core/Session/AccountSetEvent.php Event fired when an account is set for the current session.
AccountSettingsForm class Drupal\user core/modules/user/src/AccountSettingsForm.php Configure user settings for this site. 3 1
AccountSwitcher class Drupal\Core\Session core/lib/Drupal/Core/Session/AccountSwitcher.php An implementation of AccountSwitcherInterface. 2
AccountSwitcherInterface interface Drupal\Core\Session core/lib/Drupal/Core/Session/AccountSwitcherInterface.php Defines an interface for a service for safe account switching. 1 8
AccountSwitcherTest class Drupal\KernelTests\Core\Session core/tests/Drupal/KernelTests/Core/Session/AccountSwitcherTest.php Test case for account switching.
Action class Drupal\Core\Annotation core/lib/Drupal/Core/Annotation/Action.php Defines an Action annotation object.
Action class Drupal\system\Plugin\migrate\source core/modules/system/src/Plugin/migrate/source/Action.php Drupal action source from database. 1
ActionAddForm class Drupal\action\Form core/modules/action/src/Form/ActionAddForm.php Provides a form for action add forms. 1
ActionAdminManageForm class Drupal\action\Form core/modules/action/src/Form/ActionAdminManageForm.php Provides a configuration form for configurable actions.
ActionBase abstract class Drupal\Core\Action core/lib/Drupal/Core/Action/ActionBase.php Provides a base implementation for an Action plugin. 3 2
ActionConfigEntityInterface interface Drupal\system core/modules/system/src/ActionConfigEntityInterface.php Provides an interface defining an action entity. 1
ActionDeleteForm class Drupal\action\Form core/modules/action/src/Form/ActionDeleteForm.php Builds a form to delete an action.
ActionEditForm class Drupal\action\Form core/modules/action/src/Form/ActionEditForm.php Provides a form for action edit forms. 1
ActionFormAjaxTest class Drupal\Tests\action\FunctionalJavascript core/modules/action/tests/src/FunctionalJavascript/ActionFormAjaxTest.php Tests action plugins using JavaScript.
ActionFormBase abstract class Drupal\action\Form core/modules/action/src/Form/ActionFormBase.php Provides a base form for action forms. 2
ActionInterface interface Drupal\Core\Action core/lib/Drupal/Core/Action/ActionInterface.php Provides an interface for an Action plugin. 1 2 1
ActionJsonAnonTest class Drupal\Tests\action\Functional\Rest core/modules/action/tests/src/Functional/Rest/ActionJsonAnonTest.php @group action @group legacy
ActionJsonBasicAuthTest class Drupal\Tests\action\Functional\Rest core/modules/action/tests/src/Functional/Rest/ActionJsonBasicAuthTest.php @group action @group legacy
ActionJsonCookieTest class Drupal\Tests\action\Functional\Rest core/modules/action/tests/src/Functional/Rest/ActionJsonCookieTest.php @group action @group legacy
ActionListTest class Drupal\Tests\action\Functional core/modules/action/tests/src/Functional/ActionListTest.php Test behaviors when visiting the action listing page.
ActionLocalTasksTest class Drupal\Tests\action\Unit\Menu core/modules/action/tests/src/Unit/Menu/ActionLocalTasksTest.php Tests action local tasks.
ActionManager class Drupal\Core\Action core/lib/Drupal/Core/Action/ActionManager.php Provides an Action plugin manager. 1 2
ActionPluginCollection class Drupal\Core\Action core/lib/Drupal/Core/Action/ActionPluginCollection.php Provides a container for lazily loading Action plugins.
ActionResourceTestBase abstract class Drupal\Tests\action\Functional\Rest core/modules/action/tests/src/Functional/Rest/ActionResourceTestBase.php 6
Actions class Drupal\Core\Render\Element core/lib/Drupal/Core/Render/Element/Actions.php
ActionsTest class Drupal\KernelTests\Core\Render\Element core/tests/Drupal/KernelTests/Core/Render/Element/ActionsTest.php @coversDefaultClass \Drupal\Core\Render\Element\Actions @group Render
ActionTest class Drupal\Tests\system\Kernel\Action core/modules/system/tests/src/Kernel/Action/ActionTest.php Tests action plugins.
ActionTest class Drupal\Tests\system\Kernel\Plugin\migrate\source core/modules/system/tests/src/Kernel/Plugin/migrate/source/ActionTest.php Tests actions source plugin.
ActionTest class Drupal\Tests\action\Functional\Jsonapi core/modules/action/tests/src/Functional/Jsonapi/ActionTest.php JSON:API integration test for the "Action" config entity type.
ActionUninstallTest class Drupal\Tests\action\Functional core/modules/action/tests/src/Functional/ActionUninstallTest.php Tests that uninstalling Actions UI does not remove other modules' actions.
ActionValidationTest class Drupal\Tests\system\Kernel\Entity core/modules/system/tests/src/Kernel/Entity/ActionValidationTest.php Tests validation of action entities.
ActionXmlAnonTest class Drupal\Tests\action\Functional\Rest core/modules/action/tests/src/Functional/Rest/ActionXmlAnonTest.php @group action @group legacy
ActionXmlBasicAuthTest class Drupal\Tests\action\Functional\Rest core/modules/action/tests/src/Functional/Rest/ActionXmlBasicAuthTest.php @group action @group legacy
ActionXmlCookieTest class Drupal\Tests\action\Functional\Rest core/modules/action/tests/src/Functional/Rest/ActionXmlCookieTest.php @group action @group legacy
ActiveLinkResponseFilter class Drupal\Core\EventSubscriber core/lib/Drupal/Core/EventSubscriber/ActiveLinkResponseFilter.php Subscribes to filter HTML responses, to set attributes on active links. 1 2
ActiveLinkResponseFilterTest class Drupal\Tests\Core\EventSubscriber core/tests/Drupal/Tests/Core/EventSubscriber/ActiveLinkResponseFilterTest.php @coversDefaultClass \Drupal\Core\EventSubscriber\ActiveLinkResponseFilter @group EventSubscriber
ActiveTheme class Drupal\Core\Theme core/lib/Drupal/Core/Theme/ActiveTheme.php Defines a theme and its information needed at runtime. 4
ActiveWorkspaceCheck class Drupal\workspaces\Access core/modules/workspaces/src/Access/ActiveWorkspaceCheck.php Determines access to routes based on the presence of an active workspace. 1 2
ActiveWorkspaceCheckTest class Drupal\Tests\workspaces\Unit core/modules/workspaces/tests/src/Unit/ActiveWorkspaceCheckTest.php @coversDefaultClass \Drupal\workspaces\Access\ActiveWorkspaceCheck
ActiveWorkspaceUpdateTest class Drupal\Tests\workspaces\Functional\UpdateSystem core/modules/workspaces/tests/src/Functional/UpdateSystem/ActiveWorkspaceUpdateTest.php Tests that there is no active workspace during database updates.
AddBlockForm class Drupal\layout_builder\Form core/modules/layout_builder/src/Form/AddBlockForm.php Provides a form to add a block. 1
AddCssCommand class Drupal\Core\Ajax core/lib/Drupal/Core/Ajax/AddCssCommand.php An AJAX command for adding css to the page via ajax. 3
AddFeedTest class Drupal\Tests\system\Kernel\Common core/modules/system/tests/src/Kernel/Common/AddFeedTest.php Make sure that attaching feeds works correctly with various constructs.
AddFormBase abstract class Drupal\media_library\Form core/modules/media_library/src/Form/AddFormBase.php Provides a base class for creating media items from within the media library. 3 1
AddHandler class Drupal\views_ui\Form\Ajax core/modules/views_ui/src/Form/Ajax/AddHandler.php Provides a form for adding an item in the Views UI.
AddJsCommand class Drupal\Core\Ajax core/lib/Drupal/Core/Ajax/AddJsCommand.php An AJAX command for adding JS to the page via AJAX. 1
AddPermissionsUpdateTest class Drupal\Tests\help\Functional core/modules/help/tests/src/Functional/AddPermissionsUpdateTest.php Tests help_post_update_add_permissions_to_roles().
AddRoleUserTest class Drupal\Tests\user\Unit\Plugin\Action core/modules/user/tests/src/Unit/Plugin/Action/AddRoleUserTest.php @coversDefaultClass \Drupal\user\Plugin\Action\AddRoleUser @group user
AddSectionController class Drupal\layout_builder\Controller core/modules/layout_builder/src/Controller/AddSectionController.php Defines a controller to add a new section.

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