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
GlossaryViewTest		class	Drupal\Tests\views\FunctionalJavascript	core/modules/views/tests/src/FunctionalJavascript/GlossaryViewTest.php	Tests the basic AJAX functionality of the Glossary View.
GotoAction		class	Drupal\Core\Action\Plugin\Action	core/lib/Drupal/Core/Action/Plugin/Action/GotoAction.php	Redirects to a different URL.
Graph		class	Drupal\Component\Graph	core/lib/Drupal/Component/Graph/Graph.php	Directed acyclic graph manipulation.		6
GraphTest		class	Drupal\Tests\Component\Graph	core/tests/Drupal/Tests/Component/Graph/GraphTest.php	@coversDefaultClass \Drupal\Component\Graph\Graph[[api-linebreak]] @group Graph
Grid		class	Drupal\views\Plugin\views\style	core/modules/views/src/Plugin/views/style/Grid.php	Style plugin to render each item in a grid cell.		1
GroupByNumeric		class	Drupal\views\Plugin\views\sort	core/modules/views/src/Plugin/views/sort/GroupByNumeric.php	Handler for GROUP BY on simple numeric fields.
GroupByNumeric		class	Drupal\views\Plugin\views\filter	core/modules/views/src/Plugin/views/filter/GroupByNumeric.php	Simple filter to handle greater than/less than filters.
GroupByNumeric		class	Drupal\views\Plugin\views\argument	core/modules/views/src/Plugin/views/argument/GroupByNumeric.php	Simple handler for arguments using group by.
GroupByTest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/GroupByTest.php	Tests UI of aggregate functionality..
GroupedExposedFilterTest		class	Drupal\Tests\views\FunctionalJavascript\Plugin\views\Handler	core/modules/views/tests/src/FunctionalJavascript/Plugin/views/Handler/GroupedExposedFilterTest.php	Tests the grouped exposed filter admin UI.
GroupwiseMax		class	Drupal\views\Plugin\views\relationship	core/modules/views/src/Plugin/views/relationship/GroupwiseMax.php	The relationship handler for groupwise maximum queries.
HalEntityNormalizationTrait		trait	Drupal\Tests\hal\Functional\EntityResource	core/modules/hal/tests/src/Functional/EntityResource/HalEntityNormalizationTrait.php	Trait for EntityResourceTestBase subclasses testing formats using HAL.		19
HalLinkManagerTest		class	Drupal\Tests\hal\Kernel	core/modules/hal/tests/src/Kernel/HalLinkManagerTest.php	@coversDefaultClass \Drupal\hal\LinkManager\LinkManager[[api-linebreak]] @group hal @group legacy
HalServiceProvider		class	Drupal\hal	core/modules/hal/src/HalServiceProvider.php	Adds hal+json as known format.
HalSettingsDeletionUpdateTest		class	Drupal\Tests\hal\Functional\Update	core/modules/hal/tests/src/Functional/Update/HalSettingsDeletionUpdateTest.php	Ensures that update hook is run properly for deleting obsolete Hal settings.
Handle		class	Drupal\Component\Assertion	core/lib/Drupal/Component/Assertion/Handle.php	Handler for runtime assertion failures.		2
HandleMultiplesTest		class	Drupal\Tests\migrate\Kernel\process	core/modules/migrate/tests/src/Kernel/process/HandleMultiplesTest.php	Tests process pipelines with scalar and multiple values handling.
Handler		class	Drupal\Composer\Plugin\Scaffold	composer/Plugin/Scaffold/Handler.php	Core class of the plugin.		1
HandlerAggregatorTest		class	Drupal\Tests\aggregator\Functional\Views\Handler	core/modules/aggregator/tests/src/Functional/Views/Handler/HandlerAggregatorTest.php	Tests instances of the aggregator related view handlers.
HandlerAliasTest		class	Drupal\Tests\views\Kernel\Handler	core/modules/views/tests/src/Kernel/Handler/HandlerAliasTest.php	Tests handler table and field aliases.
HandlerAllTest		class	Drupal\Tests\views\Functional\Handler	core/modules/views/tests/src/Functional/Handler/HandlerAllTest.php	Tests instances of all handlers.
HandlerArgumentUserUidTest		class	Drupal\Tests\user\Kernel\Views	core/modules/user/tests/src/Kernel/Views/HandlerArgumentUserUidTest.php	Tests the handler of the user: uid Argument.
HandlerBase		abstract class	Drupal\views\Plugin\views	core/modules/views/src/Plugin/views/HandlerBase.php	Base class for Views handler plugins.	7	13
HandlerBaseTest		class	Drupal\Tests\views\Unit\Plugin	core/modules/views/tests/src/Unit/Plugin/HandlerBaseTest.php	@coversDefaultClass \Drupal\views\Plugin\views\HandlerBase[[api-linebreak]] @group Views
HandlerFieldFieldTest		class	Drupal\Tests\field\Kernel\Views	core/modules/field/tests/src/Kernel/Views/HandlerFieldFieldTest.php	Tests the field rendering in views.
HandlerFieldPermissionTest		class	Drupal\Tests\user\Kernel\Views	core/modules/user/tests/src/Kernel/Views/HandlerFieldPermissionTest.php	Tests the permission field handler.
HandlerFieldRoleTest		class	Drupal\Tests\user\Functional\Views	core/modules/user/tests/src/Functional/Views/HandlerFieldRoleTest.php	Tests the handler of the user: role field.
HandlerFieldUserNameTest		class	Drupal\Tests\user\Functional\Views	core/modules/user/tests/src/Functional/Views/HandlerFieldUserNameTest.php	Tests the handler of the user: name field.
HandlerFilterCurrentUserTest		class	Drupal\Tests\user\Kernel\Views	core/modules/user/tests/src/Kernel/Views/HandlerFilterCurrentUserTest.php	Tests the current user filter handler.
HandlerFilterPermissionTest		class	Drupal\Tests\user\Kernel\Views	core/modules/user/tests/src/Kernel/Views/HandlerFilterPermissionTest.php	Tests the permissions filter handler.
HandlerFilterRolesTest		class	Drupal\Tests\user\Kernel\Views	core/modules/user/tests/src/Kernel/Views/HandlerFilterRolesTest.php	Tests the roles filter handler.
HandlerFilterUserNameTest		class	Drupal\Tests\user\Functional\Views	core/modules/user/tests/src/Functional/Views/HandlerFilterUserNameTest.php	Tests the handler of the user: name filter.
HandlerInterface		interface	Drupal\Tests\Core\DependencyInjection\Compiler	core/tests/Drupal/Tests/Core/DependencyInjection/Compiler/TaggedHandlersPassTest.php		1
HandlerStackConfigurator		class	Drupal\Core\Http	core/lib/Drupal/Core/Http/HandlerStackConfigurator.php	Defines a class for configuring middlewares on the http handler stack.			2
HandlerTest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/HandlerTest.php	Tests handler UI for views.
HandlerTest		class	Drupal\Tests\views\Functional\Handler	core/modules/views/tests/src/Functional/Handler/HandlerTest.php	Tests abstract handler definitions.
HandlerTestTrait		trait	Drupal\Tests\views\Unit\Plugin	core/modules/views/tests/src/Unit/Plugin/HandlerTestTrait.php	Test trait to mock dependencies of a handler.		1
HeadersCacheContext		class	Drupal\Core\Cache\Context	core/lib/Drupal/Core/Cache/Context/HeadersCacheContext.php	Defines the HeadersCacheContext service, for "per header" caching.		1	2
HeadersCacheContextTest		class	Drupal\Tests\Core\Cache\Context	core/tests/Drupal/Tests/Core/Cache/Context/HeadersCacheContextTest.php	@coversDefaultClass \Drupal\Core\Cache\Context\HeadersCacheContext[[api-linebreak]] @group Cache
Heading		class	Drupal\ckeditor5\Plugin\CKEditor5Plugin	core/modules/ckeditor5/src/Plugin/CKEditor5Plugin/Heading.php	CKEditor 5 Heading plugin.		5	1
HeadingPluginTest		class	Drupal\Tests\ckeditor5\Unit	core/modules/ckeditor5/tests/src/Unit/HeadingPluginTest.php	@coversDefaultClass \Drupal\ckeditor5\Plugin\CKEditor5Plugin\Language[[api-linebreak]] @group ckeditor5 @internal
HelpBlock		class	Drupal\help\Plugin\Block	core/modules/help/src/Plugin/Block/HelpBlock.php	Provides a 'Help' block.
HelpBlockTest		class	Drupal\Tests\help\Functional	core/modules/help/tests/src/Functional/HelpBlockTest.php	Tests display of help block.
HelpBreadcrumbBuilder		class	Drupal\help_topics	core/modules/help_topics/src/HelpBreadcrumbBuilder.php	Provides a breadcrumb builder for help topic pages.			2
HelpController		class	Drupal\help\Controller	core/modules/help/src/Controller/HelpController.php	Controller routines for help routes.
HelpEmptyPageTest		class	Drupal\Tests\help\Kernel	core/modules/help/tests/src/Kernel/HelpEmptyPageTest.php	Tests the empty HTML page.
HelpPageOrderTest		class	Drupal\Tests\help\Functional	core/modules/help/tests/src/Functional/HelpPageOrderTest.php	Verify the order of the help page.	1
HelpPageReverseOrderTest		class	Drupal\Tests\help\Functional	core/modules/help/tests/src/Functional/HelpPageReverseOrderTest.php	Verify the order of the help page with an alter hook.
HelpPageTestController		class	Drupal\help_page_test	core/modules/help/tests/modules/help_page_test/src/HelpPageTestController.php	Provides controllers for testing the help block.
HelpSearch		class	Drupal\help_topics\Plugin\Search	core/modules/help_topics/src/Plugin/Search/HelpSearch.php	Handles searching for help using the Search module index.		1

Other projects

Buggy or inaccurate documentation? Please file an issue. Need support? Need help programming? Connect with the Drupal community.