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Classes, traits, and interfaces in Drupal 8

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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
CommentTypeJsonBasicAuthTest	class	Drupal\Tests\comment\Functional\Rest	core/modules/comment/tests/src/Functional/Rest/CommentTypeJsonBasicAuthTest.php	@group rest
CommentTypeJsonCookieTest	class	Drupal\Tests\comment\Functional\Rest	core/modules/comment/tests/src/Functional/Rest/CommentTypeJsonCookieTest.php	@group rest
CommentTypeListBuilder	class	Drupal\comment	core/modules/comment/src/CommentTypeListBuilder.php	Defines a class to build a listing of comment type entities.
CommentTypeResourceTestBase	abstract class	Drupal\Tests\comment\Functional\Rest	core/modules/comment/tests/src/Functional/Rest/CommentTypeResourceTestBase.php	ResourceTestBase for CommentType entity.	10	4
CommentTypeResourceTestBase Deprecated	abstract class	Drupal\Tests\rest\Functional\EntityResource\CommentType	core/modules/rest/tests/src/Functional/EntityResource/CommentType/CommentTypeResourceTestBase.php
CommentTypeTest	class	Drupal\Tests\jsonapi\Functional	core/modules/jsonapi/tests/src/Functional/CommentTypeTest.php	JSON:API integration test for the "CommentType" config entity type.
CommentTypeTest	class	Drupal\Tests\comment\Functional	core/modules/comment/tests/src/Functional/CommentTypeTest.php	Ensures that comment type functions work correctly.
CommentTypeTest	class	Drupal\Tests\comment\Kernel\Plugin\migrate\source\d7	core/modules/comment/tests/src/Kernel/Plugin/migrate/source/d7/CommentTypeTest.php	Tests D7 comment type source plugin.
CommentTypeXmlAnonTest	class	Drupal\Tests\comment\Functional\Rest	core/modules/comment/tests/src/Functional/Rest/CommentTypeXmlAnonTest.php	@group rest
CommentTypeXmlBasicAuthTest	class	Drupal\Tests\comment\Functional\Rest	core/modules/comment/tests/src/Functional/Rest/CommentTypeXmlBasicAuthTest.php	@group rest
CommentTypeXmlCookieTest	class	Drupal\Tests\comment\Functional\Rest	core/modules/comment/tests/src/Functional/Rest/CommentTypeXmlCookieTest.php	@group rest
CommentUninstallTest	class	Drupal\Tests\comment\Kernel	core/modules/comment/tests/src/Kernel/CommentUninstallTest.php	Tests comment module uninstall.
CommentUpdateTest	class	Drupal\Tests\comment\Functional\Update	core/modules/comment/tests/src/Functional/Update/CommentUpdateTest.php	Tests that comment settings are properly updated during database updates.
CommentUserNameTest	class	Drupal\Tests\comment\Kernel\Views	core/modules/comment/tests/src/Kernel/Views/CommentUserNameTest.php	Tests comment user name field
CommentValidationTest	class	Drupal\Tests\comment\Kernel	core/modules/comment/tests/src/Kernel/CommentValidationTest.php	Tests comment validation constraints.
CommentVariable Deprecated	class	Drupal\comment\Plugin\migrate\source\d6	core/modules/comment/src/Plugin/migrate/source/d6/CommentVariable.php	Plugin annotation @MigrateSource( id = "d6_comment_variable", source_module = "comment" )	1
CommentVariablePerCommentType Deprecated	class	Drupal\comment\Plugin\migrate\source\d6	core/modules/comment/src/Plugin/migrate/source/d6/CommentVariablePerCommentType.php	Plugin annotation @MigrateSource( id = "d6_comment_variable_per_comment_type", source_module = "comment" )
CommentVariablePerCommentTypeTest	class	Drupal\Tests\comment\Kernel\Plugin\migrate\source\d6	core/modules/comment/tests/src/Kernel/Plugin/migrate/source/d6/CommentVariablePerCommentTypeTest.php	Tests comment variable per comment type source plugin.
CommentVariableTest	class	Drupal\Tests\comment\Kernel\Plugin\migrate\source\d6	core/modules/comment/tests/src/Kernel/Plugin/migrate/source/d6/CommentVariableTest.php	Tests d6_comment_variable source plugin.
CommentViewBuilder	class	Drupal\comment	core/modules/comment/src/CommentViewBuilder.php	View builder handler for comments.
CommentViewsData	class	Drupal\comment	core/modules/comment/src/CommentViewsData.php	Provides views data for the comment entity type.
CommentViewsFieldAccessTest	class	Drupal\Tests\comment\Kernel\Views	core/modules/comment/tests/src/Kernel/Views/CommentViewsFieldAccessTest.php	Tests base field access in Views for the comment entity.
CommentViewsKernelTestBase	abstract class	Drupal\Tests\comment\Kernel\Views	core/modules/comment/tests/src/Kernel/Views/CommentViewsKernelTestBase.php	Provides a common test base for comment views tests.	1
CommentWidget	class	Drupal\comment\Plugin\Field\FieldWidget	core/modules/comment/src/Plugin/Field/FieldWidget/CommentWidget.php	Provides a default comment widget.
CommentXmlAnonTest	class	Drupal\Tests\comment\Functional\Rest	core/modules/comment/tests/src/Functional/Rest/CommentXmlAnonTest.php	@group rest
CommentXmlBasicAuthTest	class	Drupal\Tests\comment\Functional\Rest	core/modules/comment/tests/src/Functional/Rest/CommentXmlBasicAuthTest.php	@group rest
CommentXmlCookieTest	class	Drupal\Tests\comment\Functional\Rest	core/modules/comment/tests/src/Functional/Rest/CommentXmlCookieTest.php	@group rest
CommonCollectionFilterAccessTestPatternsTrait	trait	Drupal\Tests\jsonapi\Traits	core/modules/jsonapi/tests/src/Traits/CommonCollectionFilterAccessTestPatternsTrait.php	Provides common filter access control tests.		9
CommonDataConverter	class	Drupal\rdf	core/modules/rdf/src/CommonDataConverter.php	Contains methods for common data conversions.
CommonTestController	class	Drupal\common_test\Controller	core/modules/system/tests/modules/common_test/src/Controller/CommonTestController.php	Controller routines for common_test routes.
CompatibilityFixTest	class	Drupal\KernelTests\Core\Update	core/tests/Drupal/KernelTests/Core/Update/CompatibilityFixTest.php	Tests that extensions that are incompatible with the current core version are disabled.
CompiledRoute	class	Drupal\Core\Routing	core/lib/Drupal/Core/Routing/CompiledRoute.php	A compiled route contains derived information from a route object.
ComplexDataConstraint	class	Drupal\Core\Validation\Plugin\Validation\Constraint	core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/ComplexDataConstraint.php	Complex data constraint.
ComplexDataConstraintValidator	class	Drupal\Core\Validation\Plugin\Validation\Constraint	core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/ComplexDataConstraintValidator.php	Validates complex data.
ComplexDataConstraintValidatorTest	class	Drupal\KernelTests\Core\TypedData	core/tests/Drupal/KernelTests/Core/TypedData/ComplexDataConstraintValidatorTest.php	Tests ComplexData validation constraint with both valid and invalid values for a key.
ComplexDataDefinitionBase	abstract class	Drupal\Core\TypedData	core/lib/Drupal/Core/TypedData/ComplexDataDefinitionBase.php	Base class for complex data definitions.	2	1
ComplexDataDefinitionInterface	interface	Drupal\Core\TypedData	core/lib/Drupal/Core/TypedData/ComplexDataDefinitionInterface.php	Interface for complex data definitions.	3	7
ComplexDataInterface	interface	Drupal\Core\TypedData	core/lib/Drupal/Core/TypedData/ComplexDataInterface.php	Interface for complex data; i.e. data containing named and typed properties.	4	15
ComplexDataNormalizer	class	Drupal\serialization\Normalizer	core/modules/serialization/src/Normalizer/ComplexDataNormalizer.php	Converts the Drupal entity object structures to a normalized array.	3	1	2
ComplexDataNormalizerTest	class	Drupal\Tests\serialization\Unit\Normalizer	core/modules/serialization/tests/src/Unit/Normalizer/ComplexDataNormalizerTest.php	@coversDefaultClass \Drupal\serialization\Normalizer\ComplexDataNormalizer @group serialization
ComplexTestType	class	Drupal\workflow_type_test\Plugin\WorkflowType	core/modules/workflows/tests/modules/workflow_type_test/src/Plugin/WorkflowType/ComplexTestType.php	Test workflow type.
ComplexTestTypeConfigureForm	class	Drupal\workflow_type_test\Form	core/modules/workflows/tests/modules/workflow_type_test/src/Form/ComplexTestTypeConfigureForm.php	Form to configure the complex test workflow type.
ComplexTestTypeStateForm	class	Drupal\workflow_type_test\Form	core/modules/workflows/tests/modules/workflow_type_test/src/Form/ComplexTestTypeStateForm.php	Form to configure the complex test workflow states.
ComplexTestTypeTransitionForm	class	Drupal\workflow_type_test\Form	core/modules/workflows/tests/modules/workflow_type_test/src/Form/ComplexTestTypeTransitionForm.php	Form to configure the complex test workflow states.
ComplexWorkflowTypeTest	class	Drupal\Tests\workflows\Kernel	core/modules/workflows/tests/src/Kernel/ComplexWorkflowTypeTest.php	Workflow entity tests that require modules or storage.
ComponentEntityDisplayBase	abstract class	Drupal\migrate\Plugin\migrate\destination	core/modules/migrate/src/Plugin/migrate/destination/ComponentEntityDisplayBase.php	Provides a destination plugin for migrating entity display components.	3	2
Composer	class	Drupal\Composer	composer/Composer.php	Provides static functions for composer script events. See also core/lib/Drupal/Composer/Composer.php, which contains similar scripts needed by projects that include drupal/core. Scripts that are only needed by drupal/drupal go here.		5
Composer	class	Drupal\Core\Composer	core/lib/Drupal/Core/Composer/Composer.php	Provides static functions for composer script events.
ComposerHookTest	class	Drupal\Tests\Composer\Plugin\Scaffold\Functional	core/tests/Drupal/Tests/Composer/Plugin/Scaffold/Functional/ComposerHookTest.php	Tests Composer Hooks that run scaffold operations.
ComposerIntegrationTest	class	Drupal\Tests	core/tests/Drupal/Tests/ComposerIntegrationTest.php	Tests Composer integration.

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