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
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.
ReEnableModuleFieldTest		class	Drupal\Tests\field\Functional	core/modules/field/tests/src/Functional/ReEnableModuleFieldTest.php	Tests the behavior of a field module after being disabled and re-enabled.
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.
ReferenceBase		abstract class	Drupal\migrate_drupal\Plugin\migrate\field	core/modules/migrate_drupal/src/Plugin/migrate/field/ReferenceBase.php	Base class for Drupal reference fields.	4	4
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
RefinableDependentAccessInterface		interface	Drupal\block_content\Access	core/modules/block_content/src/Access/RefinableDependentAccessInterface.php	An interface to allow adding an access dependency.	4	5
RefinableDependentAccessTrait		trait	Drupal\block_content\Access	core/modules/block_content/src/Access/RefinableDependentAccessTrait.php	Trait for \Drupal\block_content\Access\RefinableDependentAccessInterface.		3
RefinableDependentAccessTraitTestClass		class	Drupal\Tests\block_content\Unit\Access	core/modules/block_content/tests/src/Unit/Access/DependentAccessTest.php	Test class that implements RefinableDependentAccessInterface.
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.
RegisterSerializationClassesCompilerPass		class	Drupal\serialization	core/modules/serialization/src/RegisterSerializationClassesCompilerPass.php	Adds services tagged 'normalizer' and 'encoder' to the Serializer.	1	2
RegisterSerializationClassesCompilerPass		class	Drupal\jsonapi\DependencyInjection\Compiler	core/modules/jsonapi/src/DependencyInjection/Compiler/RegisterSerializationClassesCompilerPass.php	Adds services tagged JSON:API-only normalizers to the Serializer.		1
RegisterSerializationClassesCompilerPassTest		class	Drupal\Tests\serialization\Unit\CompilerPass	core/modules/serialization/tests/src/Unit/CompilerPass/RegisterSerializationClassesCompilerPassTest.php	@coversDefaultClass \Drupal\serialization\RegisterSerializationClassesCompilerPass[[api-linebreak]] @group serialization
RegisterServicesForDestructionPass		class	Drupal\Core\DependencyInjection\Compiler	core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterServicesForDestructionPass.php	Adds services with specific tags to "kernel_destruct_subscriber" service.		1
RegisterStreamWrappersPass		class	Drupal\Core\DependencyInjection\Compiler	core/lib/Drupal/Core/DependencyInjection/Compiler/RegisterStreamWrappersPass.php	Adds services tagged 'stream_wrapper' to the stream_wrapper_manager service.		1
RegistrationWithUserFieldsTest		class	Drupal\Tests\user\FunctionalJavascript	core/modules/user/tests/src/FunctionalJavascript/RegistrationWithUserFieldsTest.php	Tests user registration forms with additional fields.
Registry		class	Drupal\Core\Theme	core/lib/Drupal/Core/Theme/Registry.php	Defines the theme registry service.		10	2
RegistryLegacyTest		class	Drupal\Tests\Core\Theme	core/tests/Drupal/Tests/Core/Theme/RegistryLegacyTest.php	@coversDefaultClass \Drupal\Core\Theme\Registry[[api-linebreak]] @group Theme @group legacy
RegistryLegacyTest		class	Drupal\KernelTests\Core\Theme	core/tests/Drupal/KernelTests/Core/Theme/RegistryLegacyTest.php	Tests legacy behavior of the ThemeRegistry class.
RegistryTest		class	Drupal\KernelTests\Core\Theme	core/tests/Drupal/KernelTests/Core/Theme/RegistryTest.php	Tests the behavior of the ThemeRegistry class.
RegistryTest		class	Drupal\Tests\Core\Theme	core/tests/Drupal/Tests/Core/Theme/RegistryTest.php	@coversDefaultClass \Drupal\Core\Theme\Registry[[api-linebreak]] @group Theme		1
RegressionTest		class	Drupal\KernelTests\Core\Database	core/tests/Drupal/KernelTests/Core/Database/RegressionTest.php	Regression tests cases for the database layer.

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