Classes, traits, and interfaces - main - 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 1529

Name	Deprecated	Object type	Namespace	File name	Summary	Direct uses	Use statements	Strings
LazyService		class	Drupal\Tests\ProxyClass\Core\DependencyInjection\Fixture	core/tests/Drupal/Tests/ProxyClass/Core/DependencyInjection/Fixture/LazyService.php	Provides a proxy class for \Drupal\Tests\Core\DependencyInjection\Fixture\LazyService.		1
LazyService		class	Drupal\Tests\Core\DependencyInjection\Fixture	core/tests/Drupal/Tests/Core/DependencyInjection/Fixture/LazyService.php	A service used to test the handling of lazy service definitions.		1
LeaveProfileNode		class	Drupal\sdc_other_node_visitor\Twig\Profiler	core/modules/system/tests/modules/sdc_other_node_visitor/src/Twig/Profiler/LeaveProfileNode.php	Represents a profile leave node.		1
LegacyFileSystemTest		class	Drupal\KernelTests\Core\File	core/tests/Drupal/KernelTests/Core/File/LegacyFileSystemTest.php	Tests the legacy file system functions.
LegacyFrontControllerTest		class	Drupal\FunctionalTests\Bootstrap	core/tests/Drupal/FunctionalTests/Bootstrap/LegacyFrontControllerTest.php	Tests that front-controllers without symfony/runtime keep working.
LegacyHook		class	Drupal\Core\Hook\Attribute	core/lib/Drupal/Core/Hook/Attribute/LegacyHook.php	Defines a LegacyHook attribute object.		6
LegacyHookTest		class	Drupal\Tests\system\Functional\Extension	core/modules/system/tests/src/Functional/Extension/LegacyHookTest.php	Tests the LegacyHook attribute.
LegacyMimeTypeMapLoadedSubscriber		final class	Drupal\Core\File\EventSubscriber	core/lib/Drupal/Core/File/EventSubscriber/LegacyMimeTypeMapLoadedSubscriber.php	Modifies the MIME type map by calling hook_file_mimetype_mapping_alter().
LegacyMimeTypeTest		class	Drupal\KernelTests\Core\File\MimeType	core/tests/Drupal/KernelTests/Core/File/MimeType/LegacyMimeTypeTest.php	Tests deprecated file features.
LegacyModuleImplementsAlter		class	Drupal\Core\Hook\Attribute	core/lib/Drupal/Core/Hook/Attribute/LegacyModuleImplementsAlter.php	Prevents procedural hook_module_implements_alter from executing.		1
LegacyRequirementSeverityTest		class	Drupal\KernelTests\Core\Extension	core/tests/Drupal/KernelTests/Core/Extension/LegacyRequirementSeverityTest.php	Tests the legacy requirements severity deprecations.
LegacyRequirementsHook		class	Drupal\Core\Hook\Attribute	core/lib/Drupal/Core/Hook/Attribute/LegacyRequirementsHook.php	Prevents procedural requirements hook from executing.		4
LegacySessionTest		class	Drupal\Tests\system\Functional\Session	core/modules/system/tests/src/Functional/Session/LegacySessionTest.php	Drupal legacy session handling tests.
LegacySessionTestController		class	Drupal\session_test\Controller	core/modules/system/tests/modules/session_test/src/Controller/LegacySessionTestController.php	Controller providing page callbacks for legacy session tests.
LegacyStatusReportTest		class	Drupal\KernelTests\Core\Render\Element	core/tests/Drupal/KernelTests/Core/Render/Element/LegacyStatusReportTest.php	Tests the status report element legacy methods.
LegacyVersionUtility		final class	Drupal\package_manager	core/modules/package_manager/src/LegacyVersionUtility.php	A utility class for dealing with legacy version numbers.		1
LengthConstraint		class	Drupal\Core\Validation\Plugin\Validation\Constraint	core/lib/Drupal/Core/Validation/Plugin/Validation/Constraint/LengthConstraint.php	Length constraint.
LenientConfigSchemaChecker		class	Drupal\Core\Config\Development	core/lib/Drupal/Core/Config/Development/LenientConfigSchemaChecker.php	Listens to the config save event and warns about invalid schema.			4
LibrariesDirectoryFileFinder		class	Drupal\Core\Asset	core/lib/Drupal/Core/Asset/LibrariesDirectoryFileFinder.php	Finds files that are located in the supported 'libraries' directories.		2	2
LibrariesDirectoryFileFinderTest		class	Drupal\Tests\Core\Asset	core/tests/Drupal/Tests/Core/Asset/LibrariesDirectoryFileFinderTest.php	Tests Drupal\Core\Asset\LibrariesDirectoryFileFinder.
LibraryDefinitionMissingLicenseException		class	Drupal\Core\Asset\Exception	core/lib/Drupal/Core/Asset/Exception/LibraryDefinitionMissingLicenseException.php	Defines a custom exception if a library has a remote but no license.		2
LibraryDependencyResolver		class	Drupal\Core\Asset	core/lib/Drupal/Core/Asset/LibraryDependencyResolver.php	Resolves the dependencies of asset (CSS/JavaScript) libraries.		3	2
LibraryDependencyResolverInterface		interface	Drupal\Core\Asset	core/lib/Drupal/Core/Asset/LibraryDependencyResolverInterface.php	Resolves the dependencies of asset (CSS/JavaScript) libraries.	1	3
LibraryDependencyResolverTest		class	Drupal\Tests\Core\Asset	core/tests/Drupal/Tests/Core/Asset/LibraryDependencyResolverTest.php	Tests Drupal\Core\Asset\LibraryDependencyResolver.
LibraryDiscovery	in drupal:11.1.0 and is removed from drupal:12.0.0. Use \Drupal\Core\Asset\LibraryDiscoveryCollector instead.	class	Drupal\Core\Asset	core/lib/Drupal/Core/Asset/LibraryDiscovery.php	Discovers available asset libraries in Drupal.
LibraryDiscoveryCollector		class	Drupal\Core\Asset	core/lib/Drupal/Core/Asset/LibraryDiscoveryCollector.php	A CacheCollector implementation for building library extension info.		4	2
LibraryDiscoveryCollectorTest		class	Drupal\Tests\Core\Asset	core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryCollectorTest.php	Tests Drupal\Core\Asset\LibraryDiscoveryCollector.
LibraryDiscoveryIntegrationTest		class	Drupal\KernelTests\Core\Asset	core/tests/Drupal/KernelTests/Core/Asset/LibraryDiscoveryIntegrationTest.php	Tests the library discovery and library discovery parser.
LibraryDiscoveryInterface		interface	Drupal\Core\Asset	core/lib/Drupal/Core/Asset/LibraryDiscoveryInterface.php	Discovers information for asset (CSS/JavaScript) libraries.	2	2
LibraryDiscoveryParser		class	Drupal\Core\Asset	core/lib/Drupal/Core/Asset/LibraryDiscoveryParser.php	Parses library files to get extension data.	1	2	2
LibraryDiscoveryParserTest		class	Drupal\Tests\Core\Asset	core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryParserTest.php	Tests Drupal\Core\Asset\LibraryDiscoveryParser.
LibraryDiscoveryTest		class	Drupal\Tests\Core\Asset	core/tests/Drupal/Tests/Core/Asset/LibraryDiscoveryTest.php	Tests Drupal\Core\Asset\LibraryDiscoveryCollector.
LinearHistory		final class	Drupal\Core\Config\Checkpoint	core/lib/Drupal/Core/Config/Checkpoint/LinearHistory.php	A chronological list of Checkpoint objects.		2	2
LinearHistoryTest		class	Drupal\Tests\Core\Config\Checkpoint	core/tests/Drupal/Tests/Core/Config/Checkpoint/LinearHistoryTest.php	Tests Drupal\Core\Config\Checkpoint\LinearHistory.
Link		class	Drupal\Core\Render\Element	core/lib/Drupal/Core/Render/Element/Link.php	Provides a link render element.	2	3
Link		class	Drupal\Core	core/lib/Drupal/Core/Link.php	Defines an object that holds information about a link.		87
Link		final class	Drupal\jsonapi\JsonApiResource	core/modules/jsonapi/src/JsonApiResource/Link.php	Represents an RFC8288 based link.		7
LinkAccessConstraint		class	Drupal\link\Plugin\Validation\Constraint	core/modules/link/src/Plugin/Validation/Constraint/LinkAccessConstraint.php	Defines an access validation constraint for links.		1
LinkAccessConstraintValidator		class	Drupal\link\Plugin\Validation\Constraint	core/modules/link/src/Plugin/Validation/Constraint/LinkAccessConstraintValidator.php	Validates the LinkAccess constraint.		1
LinkAccessConstraintValidatorTest		class	Drupal\Tests\link\Unit\Plugin\Validation\Constraint	core/modules/link/tests/src/Unit/Plugin/Validation/Constraint/LinkAccessConstraintValidatorTest.php	Tests the LinkAccessConstraintValidator validator.
LinkApprove		class	Drupal\comment\Plugin\views\field	core/modules/comment/src/Plugin/views/field/LinkApprove.php	Provides a comment approve link.		1
LinkApproveTest		class	Drupal\Tests\comment\Unit\Plugin\views\field	core/modules/comment/tests/src/Unit/Plugin/views/field/LinkApproveTest.php	Tests Drupal\comment\Plugin\views\field\LinkApprove.
LinkBase		abstract class	Drupal\views\Plugin\views\field	core/modules/views/src/Plugin/views/field/LinkBase.php	Field handler to present a link to an entity.	5	5
LinkBaseTest		class	Drupal\Tests\views\Unit\Plugin\views\field	core/modules/views/tests/src/Unit/Plugin/views/field/LinkBaseTest.php	Tests Drupal\views\Plugin\views\field\EntityLink.
LinkCollection		final class	Drupal\jsonapi\JsonApiResource	core/modules/jsonapi/src/JsonApiResource/LinkCollection.php	Contains a set of JSON:API Link objects.		9
LinkCollectionNormalizer		class	Drupal\jsonapi\Normalizer	core/modules/jsonapi/src/Normalizer/LinkCollectionNormalizer.php	Normalizes a LinkCollection object.		1	2
LinkCollectionNormalizerTest		class	Drupal\Tests\jsonapi\Kernel\Normalizer	core/modules/jsonapi/tests/src/Kernel/Normalizer/LinkCollectionNormalizerTest.php	Tests Drupal\jsonapi\Normalizer\LinkCollectionNormalizer.
LinkExternalProtocolsConstraint		class	Drupal\link\Plugin\Validation\Constraint	core/modules/link/src/Plugin/Validation/Constraint/LinkExternalProtocolsConstraint.php	Defines a protocol validation constraint for links to external URLs.		1
LinkExternalProtocolsConstraintValidator		class	Drupal\link\Plugin\Validation\Constraint	core/modules/link/src/Plugin/Validation/Constraint/LinkExternalProtocolsConstraintValidator.php	Validates the LinkExternalProtocols constraint.		1
LinkExternalProtocolsConstraintValidatorTest		class	Drupal\Tests\link\Unit\Plugin\Validation\Constraint	core/modules/link/tests/src/Unit/Plugin/Validation/Constraint/LinkExternalProtocolsConstraintValidatorTest.php	Tests Drupal\link\Plugin\Validation\Constraint\LinkExternalProtocolsConstraintValidator.

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