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Classes, traits, and interfaces in Drupal 9

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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

Name	Type	Namespace	Location	Description	Direct uses	Use statements	Strings
ArgumentTransformTermTest	class	Drupal\Tests\taxonomy\Kernel\Views	core/modules/taxonomy/tests/src/Kernel/Views/ArgumentTransformTermTest.php	Tests taxonomy term argument transformation.
ArgumentUidRevisionTest	class	Drupal\Tests\node\Kernel\Views	core/modules/node/tests/src/Kernel/Views/ArgumentUidRevisionTest.php	Tests the argument_node_uid_revision handler.
ArgumentValidateTest	class	Drupal\Tests\user\Kernel\Views	core/modules/user/tests/src/Kernel/Views/ArgumentValidateTest.php	Tests user argument validators for ID and name.
ArgumentValidatorPluginBase	abstract class	Drupal\views\Plugin\views\argument_validator	core/modules/views/src/Plugin/views/argument_validator/ArgumentValidatorPluginBase.php	Base argument validator plugin to provide basic functionality.	4	1
ArgumentValidatorTermTest	class	Drupal\Tests\taxonomy\Kernel\Views	core/modules/taxonomy/tests/src/Kernel/Views/ArgumentValidatorTermTest.php	Tests the plugin of the taxonomy: term argument validator.
ArgumentValidatorTest	class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/ArgumentValidatorTest.php	Tests the Argument validator through the UI.
ArgumentValidatorTest	class	Drupal\Tests\views\Kernel\Plugin	core/modules/views/tests/src/Kernel/Plugin/ArgumentValidatorTest.php	Tests Views argument validators.
ArgumentValidatorTest	class	Drupal\views_test_data\Plugin\views\argument_validator	core/modules/views/tests/modules/views_test_data/src/Plugin/views/argument_validator/ArgumentValidatorTest.php	Defines an argument validator test plugin.		1
ArrayBuild	class	Drupal\migrate\Plugin\migrate\process	core/modules/migrate/src/Plugin/migrate/process/ArrayBuild.php	Builds an array based on the key and value configuration.	1	2
ArrayBuildTest	class	Drupal\Tests\migrate\Unit\process	core/modules/migrate/tests/src/Unit/process/ArrayBuildTest.php	@coversDefaultClass \Drupal\migrate\Plugin\migrate\process\ArrayBuild @group migrate
ArrayElement	abstract class	Drupal\Core\Config\Schema	core/lib/Drupal/Core/Config/Schema/ArrayElement.php	Defines a generic configuration element that contains multiple properties.	2	1
AssertBlockAppearsTrait	trait	Drupal\Tests\block\Functional	core/modules/block/tests/src/Functional/AssertBlockAppearsTrait.php	Provides test assertions for testing block appearance.		2
AssertBreadcrumbTrait	trait	Drupal\Tests\system\Functional\Menu	core/modules/system/tests/src/Functional/Menu/AssertBreadcrumbTrait.php	Provides test assertions for verifying breadcrumbs.		4
AssertButtonsTrait	trait	Drupal\Tests\node\Functional	core/modules/node/tests/src/Functional/AssertButtonsTrait.php	Asserts that buttons are present on a page.
AssertConfigEntityImportTrait	trait	Drupal\Tests\config\Traits	core/modules/config/tests/src/Traits/AssertConfigEntityImportTrait.php	Provides test assertions for testing config entity synchronization.		1
AssertConfigTrait	trait	Drupal\KernelTests	core/tests/Drupal/KernelTests/AssertConfigTrait.php	Trait to help with diffing config.		4
AssertContentTrait	trait	Drupal\KernelTests	core/tests/Drupal/KernelTests/AssertContentTrait.php	Provides test methods to assert content.		1
AssertContentTraitTest	class	Drupal\Tests\Core\Test	core/tests/Drupal/Tests/Core/Test/AssertContentTraitTest.php	@coversDefaultClass \Drupal\KernelTests\AssertContentTrait @group Test
AssertHelperTestClass	class	Drupal\Tests	core/tests/fixtures/AssertHelperTestClass.php	A helper class for deprecation of AssertHelperTrait.
AssertHelperTrait Deprecated	trait	Drupal\Tests	core/tests/Drupal/Tests/AssertHelperTrait.php	Provides helper methods for assertions.
AssertHelperTraitTest	class	Drupal\Tests	core/tests/Drupal/Tests/AssertHelperTraitTest.php	@coversDefaultClass \Drupal\Tests\AssertHelperTrait @group simpletest @group Tests @group legacy
AssertLegacyTrait Deprecated	trait	Drupal\FunctionalTests	core/tests/Drupal/FunctionalTests/AssertLegacyTrait.php	Provides convenience methods for assertions in browser tests.		2
AssertLegacyTrait Deprecated	trait	Drupal\KernelTests	core/tests/Drupal/KernelTests/AssertLegacyTrait.php	Translates Simpletest assertion methods to PHPUnit.		1
AssertLegacyTraitDeprecatedTest	class	Drupal\FunctionalTests\Core\Test	core/tests/Drupal/FunctionalTests/Core/Test/AssertLegacyTraitDeprecatedTest.php	Tests deprecated AssertLegacyTrait functionality.
AssertLegacyTraitTest	class	Drupal\Tests\Core\Assert	core/tests/Drupal/Tests/Core/Assert/AssertLegacyTraitTest.php	@coversDefaultClass \Drupal\FunctionalTests\AssertLegacyTrait @group Assert @group legacy
AssertMailTrait	trait	Drupal\Core\Test	core/lib/Drupal/Core/Test/AssertMailTrait.php	Provides methods for testing emails sent during test runs.		14
AssertMailTraitTest	class	Drupal\KernelTests\Core\Test	core/tests/Drupal/KernelTests/Core/Test/AssertMailTraitTest.php	Tests \Drupal\Core\Test\AssertMailTrait works.
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	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.		10
AttachedAssetsInterface	interface	Drupal\Core\Asset	core/lib/Drupal/Core/Asset/AttachedAssetsInterface.php	The attached assets collection for the current response.	1	8
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

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