Classes, traits, and interfaces - 8.9.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 1511

Name	Deprecated	Object type	Namespace	File name	Summary	Direct uses	Use statements	Strings
DialogRenderer		class	Drupal\Core\Render\MainContent	core/lib/Drupal/Core/Render/MainContent/DialogRenderer.php	Default main content renderer for dialog requests.	2	1	2
DialogRendererTest		class	Drupal\Tests\Core\Controller	core/tests/Drupal/Tests/Core/Controller/DialogRendererTest.php	@coversDefaultClass \Drupal\Core\Render\MainContent\DialogRenderer @group Ajax
DialogTest		class	Drupal\FunctionalJavascriptTests\Ajax	core/tests/Drupal/FunctionalJavascriptTests/Ajax/DialogTest.php	Performs tests on opening and manipulating dialogs via AJAX commands.
Diff		class	Drupal\Component\Diff	core/lib/Drupal/Component/Diff/Diff.php	Class representing a 'diff' between two sequences of strings. @todo document @subpackage DifferenceEngine	1	3
DiffArray		class	Drupal\Component\Utility	core/lib/Drupal/Component/Utility/DiffArray.php	Provides helpers to perform diffs on multi dimensional arrays.		2
DiffArrayTest		class	Drupal\Tests\Core\Common	core/tests/Drupal/Tests/Core/Common/DiffArrayTest.php	Tests the DiffArray helper class.
DiffEngine		class	Drupal\Component\Diff\Engine	core/lib/Drupal/Component/Diff/Engine/DiffEngine.php	Class used internally by Diff to actually compute the diffs.		2
DiffEngineTest		class	Drupal\Tests\Component\Diff\Engine	core/tests/Drupal/Tests/Component/Diff/Engine/DiffEngineTest.php	Test DiffEngine class.
DiffFormatter		class	Drupal\Core\Diff	core/lib/Drupal/Core/Diff/DiffFormatter.php	Diff formatter which uses returns output that can be rendered to a table.		1	2
DiffFormatter		class	Drupal\Component\Diff	core/lib/Drupal/Component/Diff/DiffFormatter.php	A class to format Diffs	1	2
DiffFormatterTest		class	Drupal\Tests\Component\Diff	core/tests/Drupal/Tests/Component/Diff/DiffFormatterTest.php	Test DiffFormatter classes.
DiffOp		class	Drupal\Component\Diff\Engine	core/lib/Drupal/Component/Diff/Engine/DiffOp.php	@todo document @private @subpackage DifferenceEngine	4	1
DiffOpAdd		class	Drupal\Component\Diff\Engine	core/lib/Drupal/Component/Diff/Engine/DiffOpAdd.php	@todo document @private @subpackage DifferenceEngine		1
DiffOpChange		class	Drupal\Component\Diff\Engine	core/lib/Drupal/Component/Diff/Engine/DiffOpChange.php	@todo document @private @subpackage DifferenceEngine		1
DiffOpCopy		class	Drupal\Component\Diff\Engine	core/lib/Drupal/Component/Diff/Engine/DiffOpCopy.php	@todo document @private @subpackage DifferenceEngine		2
DiffOpDelete		class	Drupal\Component\Diff\Engine	core/lib/Drupal/Component/Diff/Engine/DiffOpDelete.php	@todo document @private @subpackage DifferenceEngine		1
DiffOpTest		class	Drupal\Tests\Component\Diff\Engine	core/tests/Drupal/Tests/Component/Diff/Engine/DiffOpTest.php	Test DiffOp base class.
DirectoryNotReadyException		class	Drupal\Core\File\Exception	core/lib/Drupal/Core/File/Exception/DirectoryNotReadyException.php	Exception thrown when a file's destination directory is not ready.		2
DirectoryTest		class	Drupal\KernelTests\Core\File	core/tests/Drupal/KernelTests/Core/File/DirectoryTest.php	Tests operations dealing with directories.	1
DisabledDisplayTest		class	Drupal\Tests\views\Functional\Plugin	core/modules/views/tests/src/Functional/Plugin/DisabledDisplayTest.php	Tests the ability to disable and enable view displays.
DisallowBasicAuthRequests		class	Drupal\basic_auth\PageCache	core/modules/basic_auth/src/PageCache/DisallowBasicAuthRequests.php	Cache policy for pages served from basic auth.			2
DiscardLayoutChangesForm		class	Drupal\layout_builder\Form	core/modules/layout_builder/src/Form/DiscardLayoutChangesForm.php	Discards any pending changes to the layout.
DiscoverableInterface		interface	Drupal\Component\Discovery	core/lib/Drupal/Component/Discovery/DiscoverableInterface.php	Interface for classes providing a type of discovery.	2
DiscoverServiceProvidersTest		class	Drupal\Tests\Core\DrupalKernel	core/tests/Drupal/Tests/Core/DrupalKernel/DiscoverServiceProvidersTest.php	@coversDefaultClass \Drupal\Core\DrupalKernel @group DrupalKernel
DiscoveryCachedTrait		trait	Drupal\Component\Plugin\Discovery	core/lib/Drupal/Component/Plugin/Discovery/DiscoveryCachedTrait.php			1
DiscoveryCachedTraitTest		class	Drupal\Tests\Component\Plugin\Discovery	core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryCachedTraitTest.php	@coversDefaultClass \Drupal\Component\Plugin\Discovery\DiscoveryCachedTrait @uses \Drupal\Component\Plugin\Discovery\DiscoveryTrait @group Plugin
DiscoveryException		class	Drupal\Component\Discovery	core/lib/Drupal/Component/Discovery/DiscoveryException.php	Exception thrown during discovery if the data is invalid.		3
DiscoveryInterface		interface	Drupal\Component\Plugin\Discovery	core/lib/Drupal/Component/Plugin/Discovery/DiscoveryInterface.php	An interface defining the minimum requirements of building a plugin discovery component.	15	21
DiscoveryTest1		class	com\example\PluginNamespace	core/tests/Drupal/Tests/Component/Annotation/Fixtures/PluginNamespace/DiscoveryTest1.php	Provides a custom test plugin.
DiscoveryTestBase		abstract class	Drupal\KernelTests\Core\Plugin\Discovery	core/tests/Drupal/KernelTests/Core/Plugin/Discovery/DiscoveryTestBase.php	Base class for plugin discovery tests.	4
DiscoveryTrait		trait	Drupal\Component\Plugin\Discovery	core/lib/Drupal/Component/Plugin/Discovery/DiscoveryTrait.php			10
DiscoveryTraitTest		class	Drupal\Tests\Component\Plugin\Discovery	core/tests/Drupal/Tests/Component/Plugin/Discovery/DiscoveryTraitTest.php	@group Plugin @coversDefaultClass \Drupal\Component\Plugin\Discovery\DiscoveryTrait
Display		class	Drupal\views_ui\Form\Ajax	core/modules/views_ui/src/Form/Ajax/Display.php	Provides a form for editing the Views display.
DisplayApiTest		class	Drupal\Tests\field\Kernel	core/modules/field/tests/src/Kernel/DisplayApiTest.php	Tests the field display API.
DisplayAttachmentTest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/DisplayAttachmentTest.php	Tests the UI for the attachment display plugin.
DisplayAttachmentTest		class	Drupal\Tests\views\Functional\Plugin	core/modules/views/tests/src/Functional/Plugin/DisplayAttachmentTest.php	Tests the attachment display plugin.
DisplayBlockTest		class	Drupal\Tests\block\Functional\Views	core/modules/block/tests/src/Functional/Views/DisplayBlockTest.php	Tests the block display plugin.
DisplayCRUDTest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/DisplayCRUDTest.php	Tests creation, retrieval, updating, and deletion of displays in the Web UI.
DisplayEntityReferenceTest		class	Drupal\Tests\views\Functional\Plugin	core/modules/views/tests/src/Functional/Plugin/DisplayEntityReferenceTest.php	Tests the entity reference display plugin.
DisplayExtenderPluginBase		abstract class	Drupal\views\Plugin\views\display_extender	core/modules/views/src/Plugin/views/display_extender/DisplayExtenderPluginBase.php	Base class for Views display extender plugins.	2	1
DisplayExtenderTest		class	Drupal\Tests\views\Kernel\Plugin	core/modules/views/tests/src/Kernel/Plugin/DisplayExtenderTest.php	Tests the display extender plugins.
DisplayExtenderTest		class	Drupal\views_test_data\Plugin\views\display_extender	core/modules/views/tests/modules/views_test_data/src/Plugin/views/display_extender/DisplayExtenderTest.php	Defines a display extender test plugin.	2	1
DisplayExtenderTest2		class	Drupal\views_test_data\Plugin\views\display_extender	core/modules/views/tests/modules/views_test_data/src/Plugin/views/display_extender/DisplayExtenderTest2.php	Defines another display extender test plugin.
DisplayExtenderTest3		class	Drupal\views_test_data\Plugin\views\display_extender	core/modules/views/tests/modules/views_test_data/src/Plugin/views/display_extender/DisplayExtenderTest3.php	Defines the third display extender test plugin.
DisplayExtenderUITest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/DisplayExtenderUITest.php	Tests the display extender UI.
DisplayFeedTest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/DisplayFeedTest.php	Tests the UI for feed display plugin.
DisplayFeedTest		class	Drupal\Tests\views\Functional\Plugin	core/modules/views/tests/src/Functional/Plugin/DisplayFeedTest.php	Tests the feed display plugin.
DisplayFeedTranslationTest		class	Drupal\Tests\views\Functional\Plugin	core/modules/views/tests/src/Functional/Plugin/DisplayFeedTranslationTest.php	Tests the feed display plugin with translated content.
DisplayKernelTest		class	Drupal\Tests\views\Kernel\Plugin	core/modules/views/tests/src/Kernel/Plugin/DisplayKernelTest.php	Drupal unit tests for the DisplayPluginBase class.
DisplayLink		class	Drupal\views\Plugin\views\area	core/modules/views/src/Plugin/views/area/DisplayLink.php	Views area display_link handler.

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