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Classes, traits, and interfaces in Drupal 10

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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
WorkspaceXmlCookieTest	class	Drupal\Tests\workspaces\Functional\EntityResource	core/modules/workspaces/tests/src/Functional/EntityResource/WorkspaceXmlCookieTest.php	Test workspace entities for XML requests.
WriteSafeSessionHandler	class	Drupal\Core\Session	core/lib/Drupal/Core/Session/WriteSafeSessionHandler.php	Wraps the session handler to prevent writes when not necessary or allowed.		1	2
WriteSafeSessionHandlerInterface	interface	Drupal\Core\Session	core/lib/Drupal/Core/Session/WriteSafeSessionHandlerInterface.php	Provides an interface for session handlers where writing can be disabled.	1
WriteSafeSessionHandlerTest	class	Drupal\Tests\Core\Session	core/tests/Drupal/Tests/Core/Session/WriteSafeSessionHandlerTest.php	Tests \Drupal\Core\Session\WriteSafeSessionHandler.
WysiwygEditor	class	Drupal\quickedit_test\Plugin\InPlaceEditor	core/modules/quickedit/tests/modules/src/Plugin/InPlaceEditor/WysiwygEditor.php	Defines the 'wysiwyg' in-place editor.
XdebugRequestTrait	trait	Drupal\Tests	core/tests/Drupal/Tests/XdebugRequestTrait.php
XmlEncoder	class	Drupal\serialization\Encoder	core/modules/serialization/src/Encoder/XmlEncoder.php	Adds XML support for serializer.		2	2
XmlEncoderTest	class	Drupal\Tests\serialization\Unit\Encoder	core/modules/serialization/tests/src/Unit/Encoder/XmlEncoderTest.php	@coversDefaultClass \Drupal\serialization\Encoder\XmlEncoder @group serialization
XmlEntityNormalizationQuirksTrait	trait	Drupal\Tests\rest\Functional\EntityResource	core/modules/rest/tests/src/Functional/EntityResource/XmlEntityNormalizationQuirksTrait.php	Trait for EntityResourceTestBase subclasses testing $format='xml'.		147
XmlNormalizationQuirksTrait	trait	Drupal\Tests\rest\Functional	core/modules/rest/tests/src/Functional/XmlNormalizationQuirksTrait.php	Trait for ResourceTestBase subclasses testing $format='xml'.		1
Xss	class	Drupal\Component\Utility	core/lib/Drupal/Component/Utility/Xss.php	Provides helper to filter for cross-site scripting.	1	41
XssTest	class	Drupal\Tests\Component\Utility	core/tests/Drupal/Tests/Component/Utility/XssTest.php	XSS Filtering tests.
XssTest	class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/XssTest.php	Tests the Xss vulnerability.
XssUnitTest	class	Drupal\KernelTests\Core\Common	core/tests/Drupal/KernelTests/Core/Common/XssUnitTest.php	Confirm that \Drupal\Component\Utility\Xss::filter() and check_url() work correctly, including invalid multi-byte sequences.
Yaml	class	Drupal\Core\Serialization	core/lib/Drupal/Core/Serialization/Yaml.php	Provides a YAML serialization implementation.		33
Yaml	class	Drupal\Component\Serialization	core/lib/Drupal/Component/Serialization/Yaml.php	Provides a YAML serialization implementation.	2	15	2
YamlDirectoryDiscovery	class	Drupal\Component\Discovery	core/lib/Drupal/Component/Discovery/YamlDirectoryDiscovery.php	Discovers multiple YAML files in a set of directories.		3
YamlDirectoryDiscovery	class	Drupal\Core\Plugin\Discovery	core/lib/Drupal/Core/Plugin/Discovery/YamlDirectoryDiscovery.php	Allows multiple YAML files per directory to define plugin definitions.		2
YamlDirectoryDiscoveryTest	class	Drupal\Tests\Component\Discovery	core/tests/Drupal/Tests/Component/Discovery/YamlDirectoryDiscoveryTest.php	YamlDirectoryDiscoveryTest component unit tests.
YamlDirectoryDiscoveryTest	class	Drupal\Tests\Core\Plugin\Discovery	core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDirectoryDiscoveryTest.php	@coversDefaultClass \Drupal\Core\Plugin\Discovery\YamlDirectoryDiscovery
YamlDiscovery	class	Drupal\Core\Discovery	core/lib/Drupal/Core/Discovery/YamlDiscovery.php	Provides discovery for YAML files within a given set of directories.		5
YamlDiscovery	class	Drupal\Component\Discovery	core/lib/Drupal/Component/Discovery/YamlDiscovery.php	Provides discovery for YAML files within a given set of directories.	1	4
YamlDiscovery	class	Drupal\Core\Plugin\Discovery	core/lib/Drupal/Core/Plugin/Discovery/YamlDiscovery.php	Allows YAML files to define plugin definitions.	2	9
YamlDiscoveryDecorator	class	Drupal\Core\Plugin\Discovery	core/lib/Drupal/Core/Plugin/Discovery/YamlDiscoveryDecorator.php	Enables YAML discovery for plugin definitions.		4
YamlDiscoveryDecoratorTest	class	Drupal\Tests\Core\Plugin\Discovery	core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryDecoratorTest.php	YamlDiscoveryDecorator unit tests.
YamlDiscoveryTest	class	Drupal\Tests\Component\Discovery	core/tests/Drupal/Tests/Component/Discovery/YamlDiscoveryTest.php	YamlDiscovery component unit tests.
YamlDiscoveryTest	class	Drupal\Tests\Core\Plugin\Discovery	core/tests/Drupal/Tests/Core/Plugin/Discovery/YamlDiscoveryTest.php	@coversDefaultClass \Drupal\Core\Plugin\Discovery\YamlDiscovery @group Plugin
YamlDiscoveryTest	class	Drupal\Tests\Core\Discovery	core/tests/Drupal/Tests/Core/Discovery/YamlDiscoveryTest.php	YamlDiscovery component unit tests.
YamlFileLoader	class	Drupal\Core\DependencyInjection	core/lib/Drupal/Core/DependencyInjection/YamlFileLoader.php	YamlFileLoader loads YAML files service definitions.		2
YamlFileLoaderTest	class	Drupal\Tests\Core\DependencyInjection	core/tests/Drupal/Tests/Core/DependencyInjection/YamlFileLoaderTest.php	@coversDefaultClass \Drupal\Core\DependencyInjection\YamlFileLoader @group DependencyInjection
YamlParserProxy	class	Drupal\Tests\Core\Serialization	core/tests/Drupal/Tests/Core/Serialization/YamlTest.php
YamlParserProxy	class	Drupal\Tests\Component\Serialization	core/tests/Drupal/Tests/Component/Serialization/YamlTest.php
YamlPecl	class	Drupal\Component\Serialization	core/lib/Drupal/Component/Serialization/YamlPecl.php	Provides default serialization for YAML using the PECL extension.		2
YamlPeclTest	class	Drupal\Tests\Component\Serialization	core/tests/Drupal/Tests/Component/Serialization/YamlPeclTest.php	Tests the YamlPecl serialization implementation.
YamlStub	class	Drupal\Tests\Component\Serialization	core/tests/Drupal/Tests/Component/Serialization/YamlTest.php
YamlSymfony	class	Drupal\Component\Serialization	core/lib/Drupal/Component/Serialization/YamlSymfony.php	Default serialization for YAML using the Symfony component.		2
YamlSymfonyTest	class	Drupal\Tests\Component\Serialization	core/tests/Drupal/Tests/Component/Serialization/YamlSymfonyTest.php	Tests the YamlSymfony serialization implementation.
YamlTest	class	Drupal\Tests\Core\Serialization	core/tests/Drupal/Tests/Core/Serialization/YamlTest.php	@coversDefaultClass \Drupal\Core\Serialization\Yaml @group Serialization
YamlTest	class	Drupal\Tests\Component\Serialization	core/tests/Drupal/Tests/Component/Serialization/YamlTest.php	@coversDefaultClass \Drupal\Component\Serialization\Yaml @group Serialization
YamlTestBase	abstract class	Drupal\Tests\Component\Serialization	core/tests/Drupal/Tests/Component/Serialization/YamlTestBase.php	Provides standard data to validate different YAML implementations.	2
YearDate	class	Drupal\datetime\Plugin\views\argument	core/modules/datetime/src/Plugin/views/argument/YearDate.php	Argument handler for a year.
YearDate	class	Drupal\views\Plugin\views\argument	core/modules/views/src/Plugin/views/argument/YearDate.php	Argument handler for a year (CCYY)
YearMonthDate	class	Drupal\views\Plugin\views\argument	core/modules/views/src/Plugin/views/argument/YearMonthDate.php	Argument handler for a year plus month (CCYYMM)
YearMonthDate	class	Drupal\datetime\Plugin\views\argument	core/modules/datetime/src/Plugin/views/argument/YearMonthDate.php	Argument handler for a year plus month (CCYYMM).
Zip	class	Drupal\Core\Archiver	core/lib/Drupal/Core/Archiver/Zip.php	Defines an archiver implementation for .zip files.	1	1
Zip	class	Drupal\system\Plugin\Archiver	core/modules/system/src/Plugin/Archiver/Zip.php	Defines an archiver implementation for .zip files.

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