Classes, traits, and interfaces - 9.5.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 1523

Name	Deprecated	Object type	Namespace	File name	Summary	Direct uses	Use statements	Strings
ReadOnlyStorageTest		class	Drupal\Tests\Core\Config	core/tests/Drupal/Tests/Core/Config/ReadOnlyStorageTest.php	@coversDefaultClass \Drupal\Core\Config\ReadOnlyStorage[[api-linebreak]] @group Config
ReadOnlyStream		abstract class	Drupal\Core\StreamWrapper	core/lib/Drupal/Core/StreamWrapper/ReadOnlyStream.php	Defines a read-only Drupal stream wrapper base class.	1	1
ReadOnlyStreamWrapperTest		class	Drupal\KernelTests\Core\File	core/tests/Drupal/KernelTests/Core/File/ReadOnlyStreamWrapperTest.php	Tests the read-only stream wrapper write functions.
Rearrange		class	Drupal\views_ui\Form\Ajax	core/modules/views_ui/src/Form/Ajax/Rearrange.php	Provides a rearrange form for Views handlers.
RearrangeFieldsTest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/RearrangeFieldsTest.php	Tests the reordering of fields via AJAX.
RearrangeFilter		class	Drupal\views_ui\Form\Ajax	core/modules/views_ui/src/Form/Ajax/RearrangeFilter.php	Provides a rearrange form for Views filters.		1
RearrangeFilterTest		class	Drupal\Tests\views_ui\Unit\Form\Ajax	core/modules/views_ui/tests/src/Unit/Form/Ajax/RearrangeFilterTest.php	Unit tests for Views UI module functions.
RebuildScriptTest		class	Drupal\Tests\system\Functional\UpdateSystem	core/modules/system/tests/src/Functional/UpdateSystem/RebuildScriptTest.php	Tests the rebuild script access and functionality.
RebuildTest		class	Drupal\Tests\system\FunctionalJavascript\Form	core/modules/system/tests/src/FunctionalJavascript/Form/RebuildTest.php	Tests functionality of \Drupal\Core\Form\FormBuilderInterface::rebuildForm().
RebuildTest		class	Drupal\Tests\system\Functional\Form	core/modules/system/tests/src/Functional/Form/RebuildTest.php	Tests functionality of \Drupal\Core\Form\FormBuilderInterface::rebuildForm().
Rectangle		class	Drupal\Component\Utility	core/lib/Drupal/Component/Utility/Rectangle.php	Rectangle rotation algebra class.		2
RectangleTest		class	Drupal\Tests\Component\Utility	core/tests/Drupal/Tests/Component/Utility/RectangleTest.php	@coversDefaultClass \Drupal\Component\Utility\Rectangle[[api-linebreak]] @group Image
RecursiveContextualValidator		class	Drupal\Core\TypedData\Validation	core/lib/Drupal/Core/TypedData/Validation/RecursiveContextualValidator.php	Defines a recursive contextual validator for Typed Data.
RecursiveContextualValidatorTest		class	Drupal\KernelTests\Core\TypedData	core/tests/Drupal/KernelTests/Core/TypedData/RecursiveContextualValidatorTest.php	@coversDefaultClass \Drupal\Core\TypedData\Validation\RecursiveContextualValidator[[api-linebreak]] @group Validation
RecursiveContextualValidatorTest		class	Drupal\Tests\Core\TypedData	core/tests/Drupal/Tests/Core/TypedData/RecursiveContextualValidatorTest.php	@coversDefaultClass \Drupal\Core\TypedData\Validation\RecursiveContextualValidator[[api-linebreak]] @group typedData
RecursivePlaceholdersTest		class	Drupal\Tests\Core\Render	core/tests/Drupal/Tests/Core/Render/RendererPlaceholdersTest.php
RecursiveValidator		class	Drupal\Core\TypedData\Validation	core/lib/Drupal/Core/TypedData/Validation/RecursiveValidator.php	Defines a recursive validator for Typed Data.		2
RedirectBlockForm		class	Drupal\form_test\Form	core/modules/system/tests/modules/form_test/src/Form/RedirectBlockForm.php	Builds a simple form that redirects on submit.
RedirectCommand		class	Drupal\Core\Ajax	core/lib/Drupal/Core/Ajax/RedirectCommand.php	Defines an AJAX command to set the window.location, loading that URL.		2
RedirectDestination		class	Drupal\Core\Routing	core/lib/Drupal/Core/Routing/RedirectDestination.php	Provides helpers for redirect destinations.		1	2
RedirectDestinationInterface		interface	Drupal\Core\Routing	core/lib/Drupal/Core/Routing/RedirectDestinationInterface.php	Provides an interface for redirect destinations.	1	8
RedirectDestinationTest		class	Drupal\Tests\Core\Routing	core/tests/Drupal/Tests/Core/Routing/RedirectDestinationTest.php	@coversDefaultClass \Drupal\Core\Routing\RedirectDestination[[api-linebreak]] @group Routing
RedirectDestinationTrait		trait	Drupal\Core\Routing	core/lib/Drupal/Core/Routing/RedirectDestinationTrait.php	Wrapper methods for the Redirect Destination.		10
RedirectFormBlock		class	Drupal\form_test\Plugin\Block	core/modules/system/tests/modules/form_test/src/Plugin/Block/RedirectFormBlock.php	Provides a block containing a simple redirect form.
RedirectLeadingSlashesSubscriber		class	Drupal\Core\EventSubscriber	core/lib/Drupal/Core/EventSubscriber/RedirectLeadingSlashesSubscriber.php	Redirects paths containing successive slashes to those with single slashes.			2
RedirectOnExceptionTest		class	Drupal\KernelTests\RequestProcessing	core/tests/Drupal/KernelTests/RequestProcessing/RedirectOnExceptionTest.php	Tests redirects on exception pages.
RedirectResponseSubscriber		class	Drupal\Core\EventSubscriber	core/lib/Drupal/Core/EventSubscriber/RedirectResponseSubscriber.php	Allows manipulation of the response object when performing a redirect.		1	2
RedirectResponseSubscriberTest		class	Drupal\Tests\Core\EventSubscriber	core/tests/Drupal/Tests/Core/EventSubscriber/RedirectResponseSubscriberTest.php	@coversDefaultClass \Drupal\Core\EventSubscriber\RedirectResponseSubscriber[[api-linebreak]] @group EventSubscriber
RedirectTest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/RedirectTest.php	Tests the redirecting after saving a views.
RedirectTest		class	Drupal\Tests\system\Functional\Form	core/modules/system/tests/src/Functional/Form/RedirectTest.php	Tests form redirection functionality.
ReferenceAccessConstraint		class	Drupal\Core\Entity\Plugin\Validation\Constraint	core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ReferenceAccessConstraint.php	Entity Reference valid reference constraint.
ReferenceAccessConstraintValidator		class	Drupal\Core\Entity\Plugin\Validation\Constraint	core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ReferenceAccessConstraintValidator.php	Checks if the current user has access to newly referenced entities.
RefinableCacheableDependencyInterface		interface	Drupal\Core\Cache	core/lib/Drupal/Core/Cache/RefinableCacheableDependencyInterface.php	Allows to add cacheability metadata to an object for the current runtime.	9	22
RefinableCacheableDependencyTrait		trait	Drupal\Core\Cache	core/lib/Drupal/Core/Cache/RefinableCacheableDependencyTrait.php	Trait for \Drupal\Core\Cache\RefinableCacheableDependencyInterface.		8
Reflection		final class	Drupal\Component\Utility	core/lib/Drupal/Component/Utility/Reflection.php	Provides helper methods for reflection.		3
ReflectionClass		trait	Drupal\Component\Annotation\Doctrine\Compatibility\Php8	core/lib/Drupal/Component/Annotation/Doctrine/Compatibility/Php8/ReflectionClass.php
ReflectionClass		trait	Drupal\Component\Annotation\Doctrine\Compatibility\Php7	core/lib/Drupal/Component/Annotation/Doctrine/Compatibility/Php7/ReflectionClass.php
ReflectionFactory		class	Drupal\Component\Plugin\Factory	core/lib/Drupal/Component/Plugin/Factory/ReflectionFactory.php	A plugin factory that maps instance configuration to constructor arguments.	1	2
ReflectionFactoryTest		class	Drupal\Tests\Component\Plugin\Factory	core/tests/Drupal/Tests/Component/Plugin/Factory/ReflectionFactoryTest.php	@group Plugin @coversDefaultClass \Drupal\Component\Plugin\Factory\ReflectionFactory[[api-linebreak]]
ReflectionTest		class	Drupal\Tests\Component\Utility	core/tests/Drupal/Tests/Component/Utility/ReflectionTest.php	@coversDefaultClass \Drupal\Component\Utility\Reflection[[api-linebreak]] @group Utility
RefreshVariablesTrait		trait	Drupal\Core\Test	core/lib/Drupal/Core/Test/RefreshVariablesTrait.php	Provides a method to refresh in-memory configuration and state information.		1
RegexConstraint		class	Drupal\Core\Validation\Plugin\Validation\Constraint	core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/RegexConstraint.php	Regex constraint.
RegexDirectoryIterator		class	Drupal\Component\FileSystem	core/lib/Drupal/Component/FileSystem/RegexDirectoryIterator.php	Iterates over files whose names match a regular expression in a directory.		3
RegexDirectoryIteratorTest		class	Drupal\Tests\Component\FileSystem	core/tests/Drupal/Tests/Component/FileSystem/RegexDirectoryIteratorTest.php	@coversDefaultClass \Drupal\Component\FileSystem\RegexDirectoryIterator[[api-linebreak]] @group FileSystem
RegionalForm		class	Drupal\system\Form	core/modules/system/src/Form/RegionalForm.php	Configure regional settings for this site.			1
RegisterAccessCheck		class	Drupal\user\Access	core/modules/user/src/Access/RegisterAccessCheck.php	Access check for user registration routes.			2
RegisterAccessChecksPass		class	Drupal\Core\DependencyInjection\Compiler	core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterAccessChecksPass.php	Adds services tagged 'access_check' to the access_manager service.		1
RegisterEntityResolversCompilerPass		class	Drupal\serialization	core/modules/serialization/src/RegisterEntityResolversCompilerPass.php	Adds services tagged 'entity_resolver' to the Serializer.
RegisterEventSubscribersPass		class	Drupal\Core\DependencyInjection\Compiler	core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterEventSubscribersPass.php	Registers all event subscribers to the event dispatcher.		1
RegisterForm		class	Drupal\user	core/modules/user/src/RegisterForm.php	Form handler for the user register forms.

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