Classes, traits, and interfaces - 10.3.x - 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 1518

Name	Deprecated	Object type	Namespace	File name	Summary	Direct uses	Use statements	Strings
ValidateMigrationStateTest		class	Drupal\Tests\migrate_drupal\Kernel\d7	core/modules/migrate_drupal/tests/src/Kernel/d7/ValidateMigrationStateTest.php	Tests the migration state information in module.migrate_drupal.yml.
ValidateMigrationStateTestTrait		trait	Drupal\Tests\migrate_drupal\Traits	core/modules/migrate_drupal/tests/src/Traits/ValidateMigrationStateTestTrait.php	Tests the migration state information in module.migrate_drupal.yml.		2
ValidationErrorBlock		class	Drupal\settings_tray_test\Plugin\Block	core/modules/settings_tray/tests/modules/settings_tray_test/src/Plugin/Block/ValidationErrorBlock.php	Provides a 'Block with validation error' test block.
ValidationTest		class	Drupal\Tests\system\Functional\Form	core/modules/system/tests/src/Functional/Form/ValidationTest.php	Tests form processing and alteration via form validation handlers.
ValidatorsTest		class	Drupal\Tests\ckeditor5\Kernel	core/modules/ckeditor5/tests/src/Kernel/ValidatorsTest.php	@covers \Drupal\ckeditor5\Plugin\Validation\Constraint\ToolbarItemConstraintValidator[[api-linebreak]] @covers \Drupal\ckeditor5\Plugin\Validation\Constraint\ToolbarItemDependencyConstraintValidator[[api-linebreak]] @covers…
ValidConsumer		class	Drupal\Tests\Core\DependencyInjection\Compiler	core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php
ValidConsumerWithExtraArguments		class	Drupal\Tests\Core\DependencyInjection\Compiler	core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php
ValidHandler		class	Drupal\Tests\Core\DependencyInjection\Compiler	core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php
ValidKeysConstraint		class	Drupal\Core\Validation\Plugin\Validation\Constraint	core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/ValidKeysConstraint.php	Checks that all the keys of a mapping are valid and required keys present.
ValidKeysConstraintValidator		class	Drupal\Core\Validation\Plugin\Validation\Constraint	core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/ValidKeysConstraintValidator.php	Validates the ValidKeys constraint.
ValidKeysConstraintValidatorTest		class	Drupal\KernelTests\Core\TypedData	core/tests/Drupal/KernelTests/Core/TypedData/ValidKeysConstraintValidatorTest.php	Tests the ValidKeys validation constraint.
ValidPathConstraint		class	Drupal\Core\Path\Plugin\Validation\Constraint	core/lib/Drupal/Core/Path/Plugin/Validation/Constraint/ValidPathConstraint.php	Validation constraint for valid system paths.
ValidPathConstraintValidator		class	Drupal\Core\Path\Plugin\Validation\Constraint	core/lib/Drupal/Core/Path/Plugin/Validation/Constraint/ValidPathConstraintValidator.php	Constraint validator for validating system paths.
ValidReferenceConstraint		class	Drupal\Core\Entity\Plugin\Validation\Constraint	core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ValidReferenceConstraint.php	Entity Reference valid reference constraint.
ValidReferenceConstraintValidator		class	Drupal\Core\Entity\Plugin\Validation\Constraint	core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ValidReferenceConstraintValidator.php	Checks if referenced entities are valid.
ValidReferenceConstraintValidatorTest		class	Drupal\KernelTests\Core\Entity	core/tests/Drupal/KernelTests/Core/Entity/ValidReferenceConstraintValidatorTest.php	Tests validation constraints for ValidReferenceConstraintValidator.
Value		class	Drupal\Core\Render\Element	core/lib/Drupal/Core/Render/Element/Value.php	Provides a form element for storage of internal information.
Variable		class	Drupal\Component\Utility	core/lib/Drupal/Component/Utility/Variable.php	Provides helpers for dealing with variables.		10
Variable		class	Drupal\migrate_drupal\Plugin\migrate\source	core/modules/migrate_drupal/src/Plugin/migrate/source/Variable.php	Drupal 6/7 variable source from database.	4	4
VariableMultiRow		class	Drupal\migrate_drupal\Plugin\migrate\source	core/modules/migrate_drupal/src/Plugin/migrate/source/VariableMultiRow.php	Drupal 6/7 multiple variables source from database.	1	1
VariableMultiRowTest		class	Drupal\Tests\migrate_drupal\Kernel\Plugin\migrate\source	core/modules/migrate_drupal/tests/src/Kernel/Plugin/migrate/source/VariableMultiRowTest.php	Tests the variable multirow source plugin.
VariableTest		class	Drupal\Tests\migrate_drupal\Kernel\Plugin\migrate\source	core/modules/migrate_drupal/tests/src/Kernel/Plugin/migrate/source/VariableTest.php	Tests the variable source plugin.
VariableTest		class	Drupal\Tests\Component\Utility	core/tests/Drupal/Tests/Component/Utility/VariableTest.php	Test variable export functionality in Variable component.
VariableTestMock		class	Drupal\Tests\Component\Utility	core/tests/Drupal/Tests/Component/Utility/VariableTest.php
VariableTranslation		class	Drupal\migrate_drupal\Plugin\migrate\source\d6	core/modules/migrate_drupal/src/Plugin/migrate/source/d6/VariableTranslation.php	Drupal 6 i18n_variable source from database.
VariableTranslation		class	Drupal\migrate_drupal\Plugin\migrate\source\d7	core/modules/migrate_drupal/src/Plugin/migrate/source/d7/VariableTranslation.php	Drupal 7 variable_store source from database.
VariableTranslationCheckRequirementsTest		class	Drupal\Tests\migrate_drupal\Kernel\d6	core/modules/migrate_drupal/tests/src/Kernel/d6/VariableTranslationCheckRequirementsTest.php	Tests check requirements for variable translation source plugin.
VariableTranslationTest		class	Drupal\Tests\migrate_drupal\Kernel\Plugin\migrate\source\d6	core/modules/migrate_drupal/tests/src/Kernel/Plugin/migrate/source/d6/VariableTranslationTest.php	Tests the variable source plugin.
VariableTranslationTest		class	Drupal\Tests\migrate_drupal\Kernel\Plugin\migrate\source\d7	core/modules/migrate_drupal/tests/src/Kernel/Plugin/migrate/source/d7/VariableTranslationTest.php	Tests the variable source plugin.
VariantBase		abstract class	Drupal\Core\Display	core/lib/Drupal/Core/Display/VariantBase.php	Provides a base class for DisplayVariant plugins.	3	3
VariantInterface		interface	Drupal\Core\Display	core/lib/Drupal/Core/Display/VariantInterface.php	Provides an interface for DisplayVariant plugins.	3
VariantManager		class	Drupal\Core\Display	core/lib/Drupal/Core/Display/VariantManager.php	Manages discovery of display variant plugins.			2
VariationCache		class	Drupal\Core\Cache	core/lib/Drupal/Core/Cache/VariationCache.php	Wraps a regular cache backend to make it support cache contexts.		3
VariationCacheFactory		class	Drupal\Core\Cache	core/lib/Drupal/Core/Cache/VariationCacheFactory.php	Defines the variation cache factory.			2
VariationCacheFactoryInterface		interface	Drupal\Core\Cache	core/lib/Drupal/Core/Cache/VariationCacheFactoryInterface.php	An interface defining variation cache factory classes.	1
VariationCacheInterface		interface	Drupal\Core\Cache	core/lib/Drupal/Core/Cache/VariationCacheInterface.php	Defines an interface for variation cache implementations.	1	4	7
VariationCacheTest		class	Drupal\Tests\Core\Cache	core/tests/Drupal/Tests/Core/Cache/VariationCacheTest.php	@coversDefaultClass \Drupal\Core\Cache\VariationCache[[api-linebreak]] @group Cache
VegetableInterface		interface	Drupal\Tests\Component\Plugin\Fixtures\vegetable	core/tests/Drupal/Tests/Component/Plugin/Fixtures/vegetable/VegetableInterface.php	Provides an interface for test plugins.	1	1
VendorHardeningPlugin		class	Drupal\Composer\Plugin\VendorHardening	composer/Plugin/VendorHardening/VendorHardeningPlugin.php	A Composer plugin to clean out your project's vendor directory.		1
VendorHardeningPluginTest		class	Drupal\Tests\Composer\Plugin\VendorHardening	core/tests/Drupal/Tests/Composer/Plugin/VendorHardening/VendorHardeningPluginTest.php	@coversDefaultClass \Drupal\Composer\Plugin\VendorHardening\VendorHardeningPlugin[[api-linebreak]] @group VendorHardening
Version		final class	Drupal\Tests\Component\Annotation\Doctrine\Fixtures\Annotation	core/tests/Drupal/Tests/Component/Annotation/Doctrine/Fixtures/Annotation/Version.php	Plugin annotation @Target("PROPERTY");
VersionById		class	Drupal\jsonapi\Revisions	core/modules/jsonapi/src/Revisions/VersionById.php	Defines a revision ID implementation for entity revision ID values.		1	2
VersionByRel		class	Drupal\jsonapi\Revisions	core/modules/jsonapi/src/Revisions/VersionByRel.php	Revision ID implementation for the default or latest revisions.		2	2
VersionHistoryController		class	Drupal\Core\Entity\Controller	core/lib/Drupal/Core/Entity/Controller/VersionHistoryController.php	Provides a controller showing revision history for an entity.		2
VersionHistoryLocalTasks		class	Drupal\Core\Entity\Plugin\Derivative	core/lib/Drupal/Core/Entity/Plugin/Derivative/VersionHistoryLocalTasks.php	Provides version history local tasks for revisionable entities.			1
VersionNegotiator		class	Drupal\jsonapi\Revisions	core/modules/jsonapi/src/Revisions/VersionNegotiator.php	Provides a version negotiator manager.		1	2
VersionNegotiatorInterface		interface	Drupal\jsonapi\Revisions	core/modules/jsonapi/src/Revisions/VersionNegotiatorInterface.php	Defines the common interface for all version negotiators.	2
VersionNegotiatorTest		class	Drupal\Tests\jsonapi\Kernel\Revisions	core/modules/jsonapi/tests/src/Kernel/Revisions/VersionNegotiatorTest.php	The test class for version negotiators.
VersionNotFoundException		class	Drupal\jsonapi\Revisions	core/modules/jsonapi/src/Revisions/VersionNotFoundException.php	Used when a version ID is valid, but the requested version does not exist.
VersionTest		class	Drupal\Tests\ckeditor5\Unit	core/modules/ckeditor5/tests/src/Unit/VersionTest.php	@group ckeditor5 @internal

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