Classes, traits, and interfaces - 11.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 1531

Name	Deprecated	Object type	Namespace	File name	Summary	Direct uses	Use statements	Strings
CastedIntFieldJoinTestBase		abstract class	Drupal\Tests\views\Kernel\Plugin	core/modules/views/tests/src/Kernel/Plugin/CastedIntFieldJoinTestBase.php	Tests the "casted_int_field_join" join plugin.	3	3
CastSql		class	Drupal\views\Plugin\views\query	core/modules/views/src/Plugin/views/query/CastSql.php	Cast handling in SQL.			2
CastSqlInterface		interface	Drupal\views\Plugin\views\query	core/modules/views/src/Plugin/views/query/CastSqlInterface.php	Defines an interface for defining cast expressions in SQL.	2	1
CategorizingPluginManager		class	Drupal\Tests\Core\Plugin	core/tests/Drupal/Tests/Core/Plugin/CategorizingPluginManagerTraitTest.php	Class that allows testing the trait.
CategorizingPluginManagerInterface		interface	Drupal\Component\Plugin	core/lib/Drupal/Component/Plugin/CategorizingPluginManagerInterface.php	Defines an interface for plugin managers that categorize plugin definitions.	7	7
CategorizingPluginManagerTrait		trait	Drupal\Core\Plugin	core/lib/Drupal/Core/Plugin/CategorizingPluginManagerTrait.php	Provides a trait for the CategorizingPluginManagerInterface.		6
CategorizingPluginManagerTraitTest		class	Drupal\Tests\Core\Plugin	core/tests/Drupal/Tests/Core/Plugin/CategorizingPluginManagerTraitTest.php	Tests Drupal\Core\Plugin\CategorizingPluginManagerTrait.
CategoryAutocompleteController		class	Drupal\block\Controller	core/modules/block/src/Controller/CategoryAutocompleteController.php	Returns autocomplete responses for block categories.		1
CategoryAutocompleteTest		class	Drupal\Tests\block\Unit	core/modules/block/tests/src/Unit/CategoryAutocompleteTest.php	Tests Drupal\block\Controller\CategoryAutocompleteController.
ChainBreadcrumbBuilderInterface		interface	Drupal\Core\Breadcrumb	core/lib/Drupal/Core/Breadcrumb/ChainBreadcrumbBuilderInterface.php	Defines an interface a chained service that builds the breadcrumb.	1
ChainedFastBackend		class	Drupal\Core\Cache	core/lib/Drupal/Core/Cache/ChainedFastBackend.php	Defines a backend with a fast and a consistent backend chain.		3
ChainedFastBackendFactory		class	Drupal\Core\Cache	core/lib/Drupal/Core/Cache/ChainedFastBackendFactory.php	Defines the chained fast cache backend factory.		1	2
ChainedFastBackendFactoryTest		class	Drupal\Tests\Core\Cache	core/tests/Drupal/Tests/Core/Cache/ChainedFastBackendFactoryTest.php	Tests Drupal\Core\Cache\ChainedFastBackendFactory.
ChainedFastBackendTest		class	Drupal\KernelTests\Core\Cache	core/tests/Drupal/KernelTests/Core/Cache/ChainedFastBackendTest.php	Unit test of the fast chained backend using the generic cache unit test base.
ChainedFastBackendTest		class	Drupal\Tests\Core\Cache	core/tests/Drupal/Tests/Core/Cache/ChainedFastBackendTest.php	Tests Drupal\Core\Cache\ChainedFastBackend.
ChainedPlaceholderStrategy		class	Drupal\Core\Render\Placeholder	core/lib/Drupal/Core/Render/Placeholder/ChainedPlaceholderStrategy.php	Renders placeholders using a chain of placeholder strategies.		1	2
ChainedPlaceholderStrategyTest		class	Drupal\Tests\Core\Render\Placeholder	core/tests/Drupal/Tests/Core/Render/Placeholder/ChainedPlaceholderStrategyTest.php	Tests Drupal\Core\Render\Placeholder\ChainedPlaceholderStrategy.
ChainEntityResolver		class	Drupal\serialization\EntityResolver	core/modules/serialization/src/EntityResolver/ChainEntityResolver.php	Resolver delegating the entity resolution to a chain of resolvers.		1	2
ChainEntityResolverInterface		interface	Drupal\serialization\EntityResolver	core/modules/serialization/src/EntityResolver/ChainEntityResolverInterface.php	An interface for delegating an entity resolution to a chain of resolvers.	1
ChainEntityResolverTest		class	Drupal\Tests\serialization\Unit\EntityResolver	core/modules/serialization/tests/src/Unit/EntityResolver/ChainEntityResolverTest.php	Tests Drupal\serialization\EntityResolver\ChainEntityResolver.
ChainRequestPolicy		class	Drupal\Core\PageCache	core/lib/Drupal/Core/PageCache/ChainRequestPolicy.php	Implements a compound request policy.	2	2
ChainRequestPolicyInterface		interface	Drupal\Core\PageCache	core/lib/Drupal/Core/PageCache/ChainRequestPolicyInterface.php	Defines the interface for compound request policies.	1
ChainRequestPolicyTest		class	Drupal\Tests\Core\PageCache	core/tests/Drupal/Tests/Core/PageCache/ChainRequestPolicyTest.php	Tests Drupal\Core\PageCache\ChainRequestPolicy.
ChainResponsePolicy		class	Drupal\Core\ProxyClass\PageCache	core/lib/Drupal/Core/ProxyClass/PageCache/ChainResponsePolicy.php	Provides a proxy class for \Drupal\Core\PageCache\ChainResponsePolicy.
ChainResponsePolicy		class	Drupal\Core\PageCache	core/lib/Drupal/Core/PageCache/ChainResponsePolicy.php	Implements a compound response policy.		1	4
ChainResponsePolicyInterface		interface	Drupal\Core\PageCache	core/lib/Drupal/Core/PageCache/ChainResponsePolicyInterface.php	Defines the interface for compound request policies.	2
ChainResponsePolicyTest		class	Drupal\Tests\Core\PageCache	core/tests/Drupal/Tests/Core/PageCache/ChainResponsePolicyTest.php	Tests Drupal\Core\PageCache\ChainResponsePolicy.
ChangedCommand		class	Drupal\Core\Ajax	core/lib/Drupal/Core/Ajax/ChangedCommand.php	An AJAX command for marking HTML elements as changed.		2
ChangedFieldItemList		class	Drupal\Core\Field	core/lib/Drupal/Core/Field/ChangedFieldItemList.php	Defines an item list class for changed fields.		2
ChangedItem		class	Drupal\Core\Field\Plugin\Field\FieldType	core/lib/Drupal/Core/Field/Plugin/Field/FieldType/ChangedItem.php	Defines the 'changed' entity field type.	1	2
ChangedTestItem		class	Drupal\entity_test\Plugin\Field\FieldType	core/modules/system/tests/modules/entity_test/src/Plugin/Field/FieldType/ChangedTestItem.php	Defines the 'changed_test' entity field type.
ChangeLogger		final class	Drupal\package_manager\EventSubscriber	core/modules/package_manager/src/EventSubscriber/ChangeLogger.php	Event subscriber to log changes that happen during the stage life cycle.		1
ChangeLoggerTest		class	Drupal\Tests\package_manager\Kernel	core/modules/package_manager/tests/src/Kernel/ChangeLoggerTest.php	Tests Change Logger.
ChangePromotedDefaultTest		class	Drupal\Tests\node\Functional\Update	core/modules/node/tests/src/Functional/Update/ChangePromotedDefaultTest.php	Tests creating base field overrides for the promote field on node types.
ChangeUserRoleBase		abstract class	Drupal\user\Plugin\Action	core/modules/user/src/Plugin/Action/ChangeUserRoleBase.php	Provides a base class for operations to change a user's role.	2
Checkbox		class	Drupal\Core\Render\Element	core/lib/Drupal/Core/Render/Element/Checkbox.php	Provides a form element for a single checkbox.
Checkboxes		class	Drupal\Core\Render\Element	core/lib/Drupal/Core/Render/Element/Checkboxes.php	Provides a form element for a set of checkboxes.		3
CheckboxTest		class	Drupal\Tests\system\Functional\Form	core/modules/system/tests/src/Functional/Form/CheckboxTest.php	Tests the form API checkbox element.
Checkpoint		final class	Drupal\Core\Config\Checkpoint	core/lib/Drupal/Core/Config/Checkpoint/Checkpoint.php	A value object to store information about a checkpoint.		5
CheckpointExistsException		final class	Drupal\Core\Config\Checkpoint	core/lib/Drupal/Core/Config/Checkpoint/CheckpointExistsException.php	Thrown when trying to add a checkpoint with an ID that already exists.		1
CheckpointListInterface		interface	Drupal\Core\Config\Checkpoint	core/lib/Drupal/Core/Config/Checkpoint/CheckpointListInterface.php	Maintains a list of checkpoints.	1
CheckpointStorage		final class	Drupal\Core\Config\Checkpoint	core/lib/Drupal/Core/Config/Checkpoint/CheckpointStorage.php	Provides a config storage that can make checkpoints.		1	2
CheckpointStorageInterface		interface	Drupal\Core\Config\Checkpoint	core/lib/Drupal/Core/Config/Checkpoint/CheckpointStorageInterface.php	Provides an interface for checkpoint storages.	1	1
CheckpointStorageTest		class	Drupal\Tests\Core\Config\Checkpoint	core/tests/Drupal/Tests/Core/Config/Checkpoint/CheckpointStorageTest.php	Tests Drupal\Core\Config\Checkpoint\CheckpointStorage.
CheckpointStorageTest		class	Drupal\KernelTests\Core\Config\Storage\Checkpoint	core/tests/Drupal/KernelTests/Core/Config/Storage/Checkpoint/CheckpointStorageTest.php	Tests CheckpointStorage operations.
CheckProvider		class	Drupal\Core\Access	core/lib/Drupal/Core/Access/CheckProvider.php	Loads access checkers from the container.		1	2
CheckProviderInterface		interface	Drupal\Core\Access	core/lib/Drupal/Core/Access/CheckProviderInterface.php	Provides the available access checkers by service IDs.	1	1
CheckRequirementsTest		class	Drupal\Tests\migrate\Unit\Plugin\migrate\destination	core/modules/migrate/tests/src/Unit/Plugin/migrate/destination/CheckRequirementsTest.php	Tests check requirements exception on DestinationBase.
Cherry		class	Drupal\plugin_test\Plugin\plugin_test\fruit	core/modules/system/tests/modules/plugin_test/src/Plugin/plugin_test/fruit/Cherry.php	Plugin annotation @Plugin( id = "cherry", label = "Cherry", color = "red" )
ChildSandboxManager		class	Drupal\Tests\package_manager\Unit	core/modules/package_manager/tests/src/Unit/SandboxManagerBaseTest.php	Test class for testing the child stage.

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