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Classes, traits, and interfaces in Drupal 8

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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
AssertMenuActiveTrailTrait Deprecated trait Drupal\system\Tests\Menu core/modules/system/src/Tests/Menu/AssertMenuActiveTrailTrait.php Provides test assertions for verifying the active menu trail.
AssertMenuActiveTrailTrait trait Drupal\Tests\system\Functional\Menu core/modules/system/tests/src/Functional/Menu/AssertMenuActiveTrailTrait.php Provides test assertions for verifying the active menu trail.
AssertPageCacheContextsAndTagsTrait Deprecated trait Drupal\system\Tests\Cache core/modules/system/src/Tests/Cache/AssertPageCacheContextsAndTagsTrait.php Provides test assertions for testing page-level cache contexts & tags. 2
AssertPageCacheContextsAndTagsTrait trait Drupal\Tests\system\Functional\Cache core/modules/system/tests/src/Functional/Cache/AssertPageCacheContextsAndTagsTrait.php Provides test assertions for testing page-level cache contexts & tags. 41
AssertUtilsTrait trait Drupal\Tests\Composer\Plugin\Scaffold core/tests/Drupal/Tests/Composer/Plugin/Scaffold/AssertUtilsTrait.php Convenience class for creating fixtures. 4
AssertViewsCacheTagsTrait trait Drupal\views\Tests core/modules/views/src/Tests/AssertViewsCacheTagsTrait.php 3
AssetCollectionGrouperInterface interface Drupal\Core\Asset core/lib/Drupal/Core/Asset/AssetCollectionGrouperInterface.php Interface defining a service that logically groups a collection of assets. 2
AssetCollectionOptimizerInterface interface Drupal\Core\Asset core/lib/Drupal/Core/Asset/AssetCollectionOptimizerInterface.php Interface defining a service that optimizes a collection of assets. 2 2
AssetCollectionRendererInterface interface Drupal\Core\Asset core/lib/Drupal/Core/Asset/AssetCollectionRendererInterface.php Interface defining a service that generates a render array to render assets. 2 4
AssetDumper class Drupal\Core\Asset core/lib/Drupal/Core/Asset/AssetDumper.php Dumps a CSS or JavaScript asset. 3
AssetDumperInterface interface Drupal\Core\Asset core/lib/Drupal/Core/Asset/AssetDumperInterface.php Interface defining a service that dumps an (optimized) asset. 1
AssetOptimizerInterface interface Drupal\Core\Asset core/lib/Drupal/Core/Asset/AssetOptimizerInterface.php Interface defining a service that optimizes an asset. 2
AssetResolver class Drupal\Core\Asset core/lib/Drupal/Core/Asset/AssetResolver.php The default asset resolver. 1 2
AssetResolverInterface interface Drupal\Core\Asset core/lib/Drupal/Core/Asset/AssetResolverInterface.php Resolves asset libraries into concrete CSS and JavaScript assets. 1 4
AssetResolverTest class Drupal\Tests\Core\Asset core/tests/Drupal/Tests/Core/Asset/AssetResolverTest.php @coversDefaultClass \Drupal\Core\Asset\AssetResolver @group Asset
AssignOwnerNode class Drupal\node\Plugin\Action core/modules/node/src/Plugin/Action/AssignOwnerNode.php Assigns ownership of a node to a user.
AttachedAssets class Drupal\Core\Asset core/lib/Drupal/Core/Asset/AttachedAssets.php The default attached assets collection. 12
AttachedAssetsInterface interface Drupal\Core\Asset core/lib/Drupal/Core/Asset/AttachedAssetsInterface.php The attached assets collection for the current response. 1 9
AttachedAssetsTest class Drupal\KernelTests\Core\Asset core/tests/Drupal/KernelTests/Core/Asset/AttachedAssetsTest.php Tests #attached assets: attached asset libraries and JavaScript settings.
AttachedRenderingBlock class Drupal\render_attached_test\Plugin\Block core/modules/system/tests/modules/render_attached_test/src/Plugin/Block/AttachedRenderingBlock.php A block we can use to test caching of #attached headers.
Attachment class Drupal\views\Plugin\views\display core/modules/views/src/Plugin/views/display/Attachment.php The plugin that handles an attachment display.
AttachmentsInterface interface Drupal\Core\Render core/lib/Drupal/Core/Render/AttachmentsInterface.php Defines an interface for responses that can expose #attached metadata. 5 11
AttachmentsResponseProcessorInterface interface Drupal\Core\Render core/lib/Drupal/Core/Render/AttachmentsResponseProcessorInterface.php Defines an interface for processing attachments of responses that have them. 2 5
AttachmentsTestDomainObject class Drupal\early_rendering_controller_test core/modules/system/tests/modules/early_rendering_controller_test/src/AttachmentsTestDomainObject.php
AttachmentsTestResponse class Drupal\early_rendering_controller_test core/modules/system/tests/modules/early_rendering_controller_test/src/AttachmentsTestResponse.php
AttachmentsTrait trait Drupal\Core\Render core/lib/Drupal/Core/Render/AttachmentsTrait.php Provides an implementation of AttachmentsInterface. 3
AttachmentTestFormatter class Drupal\views_test_formatter\Plugin\Field\FieldFormatter core/modules/views/tests/modules/views_test_formatter/src/Plugin/Field/FieldFormatter/AttachmentTestFormatter.php Plugin implementation of the 'number_unformatted_with_attachment' formatter.
Attribute class Drupal\Core\Template core/lib/Drupal/Core/Template/Attribute.php Collects, sanitizes, and renders HTML attributes. 1 37
AttributeArray class Drupal\Core\Template core/lib/Drupal/Core/Template/AttributeArray.php A class that defines a type of Attribute that can be added to as an array. 1
AttributeBoolean class Drupal\Core\Template core/lib/Drupal/Core/Template/AttributeBoolean.php A class that defines a type of boolean HTML attribute.
AttributeHelper class Drupal\Core\Template core/lib/Drupal/Core/Template/AttributeHelper.php Helper class to deal with mixed array and Attribute operations. 2
AttributeHelperTest class Drupal\Tests\Core\Template core/tests/Drupal/Tests/Core/Template/AttributeHelperTest.php @coversDefaultClass \Drupal\Core\Template\AttributeHelper @group Template
AttributesTest class Drupal\Tests\Core\Common core/tests/Drupal/Tests/Core/Common/AttributesTest.php Tests the Drupal\Core\Template\Attribute functionality.
AttributeString class Drupal\Core\Template core/lib/Drupal/Core/Template/AttributeString.php A class that represents most standard HTML attributes. 1
AttributeTest class Drupal\Tests\Core\Template core/tests/Drupal/Tests/Core/Template/AttributeTest.php @coversDefaultClass \Drupal\Core\Template\Attribute @group Template
AttributeValueBase abstract class Drupal\Core\Template core/lib/Drupal/Core/Template/AttributeValueBase.php Defines the base class for an attribute type. 3
AudioFile class Drupal\media\Plugin\media\Source core/modules/media/src/Plugin/media/Source/AudioFile.php Media source wrapping around an audio file.
AuditException class Drupal\migrate\Audit core/modules/migrate/src/Audit/AuditException.php Defines an exception to throw if an error occurs during a migration audit.
AuditorInterface interface Drupal\migrate\Audit core/modules/migrate/src/Audit/AuditorInterface.php Defines an interface for migration auditors. 1
AuditResult class Drupal\migrate\Audit core/modules/migrate/src/Audit/AuditResult.php Encapsulates the result of a migration audit. 2
Auth class Drupal\early_translation_test core/modules/locale/tests/modules/early_translation_test/src/Auth.php Test authentication provider. 2
AuthenticationCollector class Drupal\Core\Authentication core/lib/Drupal/Core/Authentication/AuthenticationCollector.php A collector class for authentication providers. 2 2
AuthenticationCollectorInterface interface Drupal\Core\Authentication core/lib/Drupal/Core/Authentication/AuthenticationCollectorInterface.php Interface for collectors of registered authentication providers. 1
AuthenticationCollectorTest class Drupal\Tests\Core\Authentication core/tests/Drupal/Tests/Core/Authentication/AuthenticationCollectorTest.php @coversDefaultClass \Drupal\Core\Authentication\AuthenticationCollector @group Authentication
AuthenticationManager class Drupal\Core\Authentication core/lib/Drupal/Core/Authentication/AuthenticationManager.php Manager for authentication. 1 2
AuthenticationManagerTest class Drupal\Tests\Core\Authentication core/tests/Drupal/Tests/Core/Authentication/AuthenticationManagerTest.php @coversDefaultClass \Drupal\Core\Authentication\AuthenticationManager @group Authentication
AuthenticationProviderChallengeInterface interface Drupal\Core\Authentication core/lib/Drupal/Core/Authentication/AuthenticationProviderChallengeInterface.php Generate a challenge when access is denied for unauthenticated users. 2 2
AuthenticationProviderFilterInterface interface Drupal\Core\Authentication core/lib/Drupal/Core/Authentication/AuthenticationProviderFilterInterface.php Restrict authentication methods to a subset of the site. 2 2
AuthenticationProviderInterface interface Drupal\Core\Authentication core/lib/Drupal/Core/Authentication/AuthenticationProviderInterface.php Interface for authentication providers. 8 8
AuthenticationProviderPass class Drupal\Core\DependencyInjection\Compiler core/lib/Drupal/Core/DependencyInjection/Compiler/AuthenticationProviderPass.php Registers the authentication_providers container parameter. 2

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