Classes, traits, and interfaces - main - drupal

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

File

core/core.api.php, line 1529

Name	Deprecated	Object type	Namespace	File name	Summary	Direct uses	Use statements	Strings
UniqueFieldConstraintTestHooks		class	Drupal\unique_field_constraint_test\Hook	core/modules/system/tests/modules/unique_field_constraint_test/src/Hook/UniqueFieldConstraintTestHooks.php	Hook implementations for unique_field_constraint_test.
UniqueFieldValueValidator		class	Drupal\Core\Validation\Plugin\Validation\Constraint	core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/UniqueFieldValueValidator.php	Validates that a field is unique for the given entity type.		3
UniqueLabelInListConstraint		class	Drupal\ckeditor5\Plugin\Validation\Constraint	core/modules/ckeditor5/src/Plugin/Validation/Constraint/UniqueLabelInListConstraint.php	Uniquely labeled list item constraint.
UniqueLabelInListConstraintValidator		class	Drupal\ckeditor5\Plugin\Validation\Constraint	core/modules/ckeditor5/src/Plugin/Validation/Constraint/UniqueLabelInListConstraintValidator.php	Uniquely labeled list item constraint validator.
UniquePathAliasConstraint		class	Drupal\Core\Path\Plugin\Validation\Constraint	core/lib/Drupal/Core/Path/Plugin/Validation/Constraint/UniquePathAliasConstraint.php	Validation constraint for unique path alias values.
UniquePathAliasConstraintValidator		class	Drupal\Core\Path\Plugin\Validation\Constraint	core/lib/Drupal/Core/Path/Plugin/Validation/Constraint/UniquePathAliasConstraintValidator.php	Constraint validator for a unique path alias.
UniqueValuesConstraintValidatorTest		class	Drupal\KernelTests\Core\Validation	core/tests/Drupal/KernelTests/Core/Validation/UniqueValuesConstraintValidatorTest.php	Tests the unique field value validation constraint.
UnitTest		final class	Drupal\Tests\Component\Foo	core/tests/PHPStan/fixtures/component-tests.php
UnitTestCase		abstract class	Drupal\Tests	core/tests/Drupal/Tests/UnitTestCase.php	Provides a base class and helpers for Drupal unit tests.	719	719
UnitTestCaseTest		class	Drupal\Tests	core/tests/Drupal/Tests/UnitTestCaseTest.php	Tests for the UnitTestCase class.
UnknownCheckpointException		final class	Drupal\Core\Config\Checkpoint	core/lib/Drupal/Core/Config/Checkpoint/UnknownCheckpointException.php	Thrown when trying to access a checkpoint that does not exist.		1
UnknownExtensionException		class	Drupal\Core\Extension\Exception	core/lib/Drupal/Core/Extension/Exception/UnknownExtensionException.php	Exception class thrown when a specified extension is not on the filesystem.		20
UnknownExtensionTypeException		class	Drupal\Core\Extension\Exception	core/lib/Drupal/Core/Extension/Exception/UnknownExtensionTypeException.php	Exception thrown when a specified extension type is not known.		2
UnknownPathExcluder		final class	Drupal\package_manager\PathExcluder	core/modules/package_manager/src/PathExcluder/UnknownPathExcluder.php	Excludes unknown paths from stage operations.		1
UnknownPathExcluderTest		class	Drupal\Tests\package_manager\Kernel\PathExcluder	core/modules/package_manager/tests/src/Kernel/PathExcluder/UnknownPathExcluderTest.php	Tests Unknown Path Excluder.
UnknownRecipeException		final class	Drupal\Core\Recipe	core/lib/Drupal/Core/Recipe/UnknownRecipeException.php	Exception thrown when recipe is can not be found.		1
UnmetDependenciesException		class	Drupal\Core\Config	core/lib/Drupal/Core/Config/UnmetDependenciesException.php	An exception thrown if configuration has unmet dependencies.		5
UnpackCollection		final class	Drupal\Composer\Plugin\RecipeUnpack	composer/Plugin/RecipeUnpack/UnpackCollection.php	A collection with packages to unpack.
UnpackCommand		final class	Drupal\Composer\Plugin\RecipeUnpack	composer/Plugin/RecipeUnpack/UnpackCommand.php	The "drupal:recipe-unpack" command class.
Unpacker		final class	Drupal\Composer\Plugin\RecipeUnpack	composer/Plugin/RecipeUnpack/Unpacker.php	Handles the details of unpacking a specific recipe.
UnpackManager		final class	Drupal\Composer\Plugin\RecipeUnpack	composer/Plugin/RecipeUnpack/UnpackManager.php	Manages the recipe unpacking process.
UnpackOptions		final class	Drupal\Composer\Plugin\RecipeUnpack	composer/Plugin/RecipeUnpack/UnpackOptions.php	Per-project options from the 'extras' section of the composer.json file.
UnpackRecipeTest		class	Drupal\BuildTests\Composer\Plugin\Unpack\Functional	core/tests/Drupal/BuildTests/Composer/Plugin/Unpack/Functional/UnpackRecipeTest.php	Tests recipe unpacking.
UnprocessableHttpEntityException		class	Drupal\jsonapi\Exception	core/modules/jsonapi/src/Exception/UnprocessableHttpEntityException.php	A class to represent a 422 - Unprocessable Entity Exception.		2
UnprocessableHttpEntityExceptionNormalizer		class	Drupal\jsonapi\Normalizer	core/modules/jsonapi/src/Normalizer/UnprocessableHttpEntityExceptionNormalizer.php	Normalizes and UnprocessableHttpEntityException.			2
UnpublishAction		class	Drupal\Core\Action\Plugin\Action	core/lib/Drupal/Core/Action/Plugin/Action/UnpublishAction.php	Unpublishes an entity.	1	2
UnpublishedBlockTest		class	Drupal\Tests\block_content\Functional	core/modules/block_content/tests/src/Functional/UnpublishedBlockTest.php	Tests unpublishing of block_content entities.
UnroutedUrlAssembler		class	Drupal\Core\Utility	core/lib/Drupal/Core/Utility/UnroutedUrlAssembler.php	Provides a way to build external or non Drupal local domain URLs.		2	2
UnroutedUrlAssemblerInterface		interface	Drupal\Core\Utility	core/lib/Drupal/Core/Utility/UnroutedUrlAssemblerInterface.php	Provides a way to build external or non Drupal local domain URLs.	1	11
UnroutedUrlAssemblerTest		class	Drupal\Tests\Core\Utility	core/tests/Drupal/Tests/Core/Utility/UnroutedUrlAssemblerTest.php	Tests Drupal\Core\Utility\UnroutedUrlAssembler.
UnroutedUrlTest		class	Drupal\Tests\Core	core/tests/Drupal/Tests/Core/UnroutedUrlTest.php	Tests Drupal\Core\Url.
UnsavedPreviewTest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/UnsavedPreviewTest.php	Tests covering Preview of unsaved Views.
UnserializableRequest		class	Drupal\Tests\Core\TempStore	core/tests/Drupal/Tests/Core/TempStore/SharedTempStoreTest.php	A class for testing.
UnstickyNode		class	Drupal\node\Plugin\Action	core/modules/node/src/Plugin/Action/UnstickyNode.php	Makes a node not sticky.
UnsupportedDataTypeConfigException		class	Drupal\Core\Config	core/lib/Drupal/Core/Config/UnsupportedDataTypeConfigException.php	Exception thrown when a config data type is invalid.		2
UnsupportedEntityTypeDefinitionException		class	Drupal\Core\Entity\Exception	core/lib/Drupal/Core/Entity/Exception/UnsupportedEntityTypeDefinitionException.php	Defines an exception thrown when an entity type definition is invalid.		4
UnsupportedRouteAttributePropertiesTest		class	Drupal\Tests\Core\Routing	core/tests/Drupal/Tests/Core/Routing/UnsupportedRouteAttributePropertiesTest.php	Tests \Drupal\Core\Routing\AttributeRouteDiscovery.
UnsupportedRouteAttributePropertyException		class	Drupal\Core\Routing	core/lib/Drupal/Core/Routing/UnsupportedRouteAttributePropertyException.php	Thrown when using unsupported route attribute properties.		1
UntrustedCallbackException		class	Drupal\Core\Security	core/lib/Drupal/Core/Security/UntrustedCallbackException.php	Exception thrown if a callback is untrusted.		4
UntrustedObject		class	Drupal\Tests\Core\Security	core/tests/Drupal/Tests/Core/Security/DoTrustedCallbackTraitTest.php	Class representing untrusted callback.
UnversionedAssetsTestHooks		class	Drupal\unversioned_assets_test\Hook	core/modules/system/tests/modules/unversioned_assets_test/src/Hook/UnversionedAssetsTestHooks.php	Hook implementations for unversioned_assets_test.
UnversionedAssetTest		class	Drupal\FunctionalTests\Asset	core/tests/Drupal/FunctionalTests/Asset/UnversionedAssetTest.php	Tests asset aggregation.
UpcastingTest		class	Drupal\Tests\system\Functional\ParamConverter	core/modules/system/tests/src/Functional/ParamConverter/UpcastingTest.php	Tests upcasting of URL arguments to entities.
Update		class	Drupal\Core\Database\Query	core/lib/Drupal/Core/Database/Query/Update.php	General class for an abstracted UPDATE operation.	2	4
Update		class	Drupal\pgsql\Driver\Database\pgsql	core/modules/pgsql/src/Driver/Database/pgsql/Update.php	PostgreSQL implementation of \Drupal\Core\Database\Query\Update.
Update		class	Drupal\core_fake\Driver\Database\CoreFakeWithAllCustomClasses	core/tests/fixtures/database_drivers/module/core_fake/src/Driver/Database/CoreFakeWithAllCustomClasses/Update.php	CoreFakeWithAllCustomClasses implementation of \Drupal\Core\Database\Update.
UpdateBackend		class	Drupal\Core\Update	core/lib/Drupal/Core/Update/UpdateBackend.php	Defines a cache backend for use during Drupal database updates.
UpdateBlockForm		class	Drupal\layout_builder\Form	core/modules/layout_builder/src/Form/UpdateBlockForm.php	Provides a form to update a block.			1
UpdateBuildIdCommand		class	Drupal\Core\Ajax	core/lib/Drupal/Core/Ajax/UpdateBuildIdCommand.php	Ajax command for updating the form build ID.		2
UpdateCacheBackendFactory		class	Drupal\Core\Update	core/lib/Drupal/Core/Update/UpdateCacheBackendFactory.php	Cache factory implementation for use during Drupal database updates.

Other projects

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.