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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
ClassyTemplatesIdenticalToStableTest	class	Drupal\Tests\Core\Theme	core/tests/Drupal/Tests/Core/Theme/ClassyTemplatesIdenticalToStableTest.php	Confirms that certain Classy templates have identical equivalents in Stable.
ClassyTest	class	Drupal\FunctionalTests\Theme	core/tests/Drupal/FunctionalTests/Theme/ClassyTest.php	Tests the classy theme.
ClassyTest	class	Drupal\Tests\system\Kernel\Render	core/modules/system/tests/src/Kernel/Render/ClassyTest.php	Tests the Classy theme.
ClearTest	class	Drupal\Tests\system\Functional\Cache	core/modules/system/tests/src/Functional/Cache/ClearTest.php
ClickSortingAJAXTest	class	Drupal\Tests\views\FunctionalJavascript	core/modules/views/tests/src/FunctionalJavascript/ClickSortingAJAXTest.php	Tests the click sorting AJAX functionality of Views exposed forms.
ClientErrorResponseSubscriber	class	Drupal\Core\EventSubscriber	core/lib/Drupal/Core/EventSubscriber/ClientErrorResponseSubscriber.php	Response subscriber to set the '4xx-response' cache tag on 4xx responses.			2
ClientFactory	class	Drupal\Core\Http	core/lib/Drupal/Core/Http/ClientFactory.php	Helper class to construct a HTTP client with Drupal specific config.		2	2
ClientFactoryTest	class	Drupal\Tests\Core\Http	core/tests/Drupal/Tests/Core/Http/ClientFactoryTest.php	@coversDefaultClass \Drupal\Core\Http\ClientFactory @group Http
CloseDialogCommand	class	Drupal\Core\Ajax	core/lib/Drupal/Core/Ajax/CloseDialogCommand.php	Defines an AJAX command that closes the current active dialog.	1	6
CloseModalDialogCommand	class	Drupal\Core\Ajax	core/lib/Drupal/Core/Ajax/CloseModalDialogCommand.php	Defines an AJAX command that closes the currently visible modal dialog.		5
CollectRoutesTest	class	Drupal\Tests\rest\Unit	core/modules/rest/tests/src/Unit/CollectRoutesTest.php	Tests the REST export view plugin.
Color	class	Drupal\Component\Utility	core/lib/Drupal/Component/Utility/Color.php	Performs color conversions.		7
Color	class	Drupal\Core\Render\Element	core/lib/Drupal/Core/Render/Element/Color.php	Provides a form element for choosing a color.
Color	class	Drupal\color\Plugin\migrate\destination	core/modules/color/src/Plugin/migrate/destination/Color.php	Persist color data to the config system.		1
Color	class	Drupal\color\Plugin\migrate\source\d7	core/modules/color/src/Plugin/migrate/source/d7/Color.php	Drupal 7 color source from database.
ColorConfigCacheInvalidator	class	Drupal\color\EventSubscriber	core/modules/color/src/EventSubscriber/ColorConfigCacheInvalidator.php	A subscriber invalidating cache tags when color config objects are saved.			2
ColorConfigSchemaTest	class	Drupal\Tests\color\Functional	core/modules/color/tests/src/Functional/ColorConfigSchemaTest.php	Ensures the color config schema is correct.
ColorLegacyTest	class	Drupal\Tests\color\Kernel	core/modules/color/tests/src/Kernel/ColorLegacyTest.php	Tests Color module's legacy code.
ColorSafePreviewTest	class	Drupal\Tests\color\Functional	core/modules/color/tests/src/Functional/ColorSafePreviewTest.php	Tests sanitizing color preview loaded from theme.
ColorSystemBrandingBlockAlter	class	Drupal\color	core/modules/color/src/ColorSystemBrandingBlockAlter.php	Provides a trusted callback to alter the system branding block.		1
ColorTest	class	Drupal\Tests\Component\Utility	core/tests/Drupal/Tests/Component/Utility/ColorTest.php	Tests Color utility class conversions.
ColorTest	class	Drupal\Tests\color\Functional	core/modules/color/tests/src/Functional/ColorTest.php	Modify the Bartik theme colors and make sure the changes are reflected on the frontend.
ColorTest	class	Drupal\Tests\color\Kernel\Plugin\migrate\source\d7	core/modules/color/tests/src/Kernel/Plugin/migrate/source/d7/ColorTest.php	Tests D7 color source plugin.
Com	class	Drupal\Component\Uuid	core/lib/Drupal/Component/Uuid/Com.php	Generates a UUID using the Windows internal GUID extension.		1
Combine	class	Drupal\views\Plugin\views\filter	core/modules/views/src/Plugin/views/filter/Combine.php	Filter handler which allows to search on multiple fields.
CommandInterface	interface	Drupal\Core\Ajax	core/lib/Drupal/Core/Ajax/CommandInterface.php	AJAX command interface.	29	11
CommandLineOrUnsafeMethod	class	Drupal\Core\PageCache\RequestPolicy	core/lib/Drupal/Core/PageCache/RequestPolicy/CommandLineOrUnsafeMethod.php	Reject when running from the command line or when HTTP method is not safe.		2
CommandLineOrUnsafeMethodTest	class	Drupal\Tests\Core\PageCache	core/tests/Drupal/Tests/Core/PageCache/CommandLineOrUnsafeMethodTest.php	@coversDefaultClass \Drupal\Core\PageCache\RequestPolicy\CommandLineOrUnsafeMethod @group PageCache
CommandProvider	class	Drupal\Composer\Plugin\Scaffold	composer/Plugin/Scaffold/CommandProvider.php	List of all commands provided by this package.		1
CommandsTest	class	Drupal\FunctionalJavascriptTests\Ajax	core/tests/Drupal/FunctionalJavascriptTests/Ajax/CommandsTest.php	Performs tests on AJAX framework commands.
CommandsTest	class	Drupal\KernelTests\Core\Ajax	core/tests/Drupal/KernelTests/Core/Ajax/CommandsTest.php	Performs tests on AJAX framework commands.
CommandWithAttachedAssetsInterface	interface	Drupal\Core\Ajax	core/lib/Drupal/Core/Ajax/CommandWithAttachedAssetsInterface.php	Interface for Ajax commands that render content and attach assets.	4
CommandWithAttachedAssetsTrait	trait	Drupal\Core\Ajax	core/lib/Drupal/Core/Ajax/CommandWithAttachedAssetsTrait.php	Trait for Ajax commands that render content and attach assets.
Comment	class	Drupal\comment\Entity	core/modules/comment/src/Entity/Comment.php	Defines the comment entity class.		61
Comment	class	Drupal\comment\Plugin\views\wizard	core/modules/comment/src/Plugin/views/wizard/Comment.php	Tests creating comment views with the wizard.
Comment	class	Drupal\comment\Plugin\migrate\source\d6	core/modules/comment/src/Plugin/migrate/source/d6/Comment.php	Drupal 6 comment source from database.
Comment	class	Drupal\comment\Plugin\migrate\source\d7	core/modules/comment/src/Plugin/migrate/source/d7/Comment.php	Drupal 7 comment source from database.
CommentAccessControlHandler	class	Drupal\comment	core/modules/comment/src/CommentAccessControlHandler.php	Defines the access control handler for the comment entity type.
CommentAccessTest	class	Drupal\Tests\comment\Functional	core/modules/comment/tests/src/Functional/CommentAccessTest.php	Tests comment administration and preview access.
CommentActionsTest	class	Drupal\Tests\comment\Functional	core/modules/comment/tests/src/Functional/CommentActionsTest.php	Tests actions provided by the Comment module.
CommentAdminOverview	class	Drupal\comment\Form	core/modules/comment/src/Form/CommentAdminOverview.php	Provides the comments overview administration form.			1
CommentAdminTest	class	Drupal\Tests\comment\Functional	core/modules/comment/tests/src/Functional/CommentAdminTest.php	Tests comment approval functionality.
CommentAdminTest	class	Drupal\Tests\comment\Functional\Views	core/modules/comment/tests/src/Functional/Views/CommentAdminTest.php	Tests comment approval functionality.
CommentAdminViewTest	class	Drupal\Tests\comment\Kernel\Views	core/modules/comment/tests/src/Kernel/Views/CommentAdminViewTest.php	Tests comment admin view filters.
CommentAdminViewUpdateTest	class	Drupal\Tests\comment\Functional\Update	core/modules/comment/tests/src/Functional/Update/CommentAdminViewUpdateTest.php	Tests that comment admin view is enabled after update.
CommentAnonymousTest	class	Drupal\Tests\comment\Functional	core/modules/comment/tests/src/Functional/CommentAnonymousTest.php	Tests anonymous commenting.
CommentAttributesTest	class	Drupal\Tests\rdf\Functional	core/modules/rdf/tests/src/Functional/CommentAttributesTest.php	Tests the RDFa markup of comments.
CommentBaseFieldTest	class	Drupal\Tests\comment\Kernel	core/modules/comment/tests/src/Kernel/CommentBaseFieldTest.php	Tests that comment as a base field.
CommentBlockTest	class	Drupal\Tests\comment\Functional	core/modules/comment/tests/src/Functional/CommentBlockTest.php	Tests comment block functionality.
CommentBookTest	class	Drupal\Tests\comment\Functional	core/modules/comment/tests/src/Functional/CommentBookTest.php	Tests visibility of comments on book pages.

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Uncaught exception thrown in session handler.

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