Classes, traits, and interfaces - 10.3.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 1518

Name	Deprecated	Object type	Namespace	File name	Summary	Direct uses	Use statements	Strings
NullHelpAndDescriptionTest		class	Drupal\Tests\node\Functional\Update	core/modules/node/tests/src/Functional/Update/NullHelpAndDescriptionTest.php	Tests the upgrade path for making content types' help and description NULL.
NullIdMap		class	Drupal\migrate\Plugin\migrate\id_map	core/modules/migrate/src/Plugin/migrate/id_map/NullIdMap.php	Defines the null ID map implementation.
NullIncludedData		class	Drupal\jsonapi\JsonApiResource	core/modules/jsonapi/src/JsonApiResource/NullIncludedData.php	Use when there are no included resources but a Data object is required.		7
NullLockBackend		class	Drupal\Core\Lock	core/lib/Drupal/Core/Lock/NullLockBackend.php	Defines a Null lock backend.		9
NullMatcherDumper		class	Drupal\Core\Routing	core/lib/Drupal/Core/Routing/NullMatcherDumper.php	Does not dump Route information.
NullNormalizer		class	Drupal\serialization\Normalizer	core/modules/serialization/src/Normalizer/NullNormalizer.php	Null normalizer.		1	2
NullNormalizerTest		class	Drupal\Tests\serialization\Unit\Normalizer	core/modules/serialization/tests/src/Unit/Normalizer/NullNormalizerTest.php	@coversDefaultClass \Drupal\serialization\Normalizer\NullNormalizer[[api-linebreak]] @group serialization
NullPathProcessorManager		class	Drupal\Core\PathProcessor	core/lib/Drupal/Core/PathProcessor/NullPathProcessorManager.php	Provides a null implementation of the path processor manager.
NullRouteMatch		class	Drupal\Core\Routing	core/lib/Drupal/Core/Routing/NullRouteMatch.php	Stub implementation of RouteMatchInterface for when there's no matched route.		1
NullStorage		class	Drupal\Core\Config	core/lib/Drupal/Core/Config/NullStorage.php	Defines a stub storage.		5
NullStorageExpirable		class	Drupal\Core\KeyValueStore	core/lib/Drupal/Core/KeyValueStore/NullStorageExpirable.php	Defines a null key/value store implementation.
NullStorageTest		class	Drupal\Tests\Core\Config	core/tests/Drupal/Tests/Core/Config/NullStorageTest.php	Tests the NullStorage.
NullTestImageEffect		class	Drupal\image_module_test\Plugin\ImageEffect	core/modules/image/tests/modules/image_module_test/src/Plugin/ImageEffect/NullTestImageEffect.php	Performs no operation on an image resource.
Number		class	Drupal\Component\Utility	core/lib/Drupal/Component/Utility/Number.php	Provides helper methods for manipulating numbers.		3
Number		class	Drupal\Core\Render\Element	core/lib/Drupal/Core/Render/Element/Number.php	Provides a form element for numeric input, with special numeric validation.	1	1
NumberField		class	Drupal\field\Plugin\migrate\field\d7	core/modules/field/src/Plugin/migrate/field/d7/NumberField.php	MigrateField plugin for Drupal 7 number fields.
NumberFieldTest		class	Drupal\Tests\field\FunctionalJavascript\Number	core/modules/field/tests/src/FunctionalJavascript/Number/NumberFieldTest.php	Tests the numeric field widget.
NumberFieldTest		class	Drupal\Tests\field\Functional\Number	core/modules/field/tests/src/Functional/Number/NumberFieldTest.php	Tests the creation of numeric fields.
NumberItemTest		class	Drupal\Tests\field\Kernel\Number	core/modules/field/tests/src/Kernel/Number/NumberItemTest.php	Tests the new entity API for the number field type.
NumberListField		class	Drupal\options\Plugin\views\argument	core/modules/options/src/Plugin/views/argument/NumberListField.php	Argument handler for list field to show human readable name in the summary.
NumberTest		class	Drupal\Tests\Component\Utility	core/tests/Drupal/Tests/Component/Utility/NumberTest.php	Tests number manipulation utilities.
NumberWidget		class	Drupal\Core\Field\Plugin\Field\FieldWidget	core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/NumberWidget.php	Plugin implementation of the 'number' widget.
NumericArgument		class	Drupal\views\Plugin\views\argument	core/modules/views/src/Plugin/views/argument/NumericArgument.php	Basic argument handler for arguments that are numeric.	4	2
NumericArgumentValidator		class	Drupal\views\Plugin\views\argument_validator	core/modules/views/src/Plugin/views/argument_validator/NumericArgumentValidator.php	Validate whether an argument is numeric or not.
NumericField		class	Drupal\views\Plugin\views\field	core/modules/views/src/Plugin/views/field/NumericField.php	Render a field as a numeric value.	3	4
NumericFilter		class	Drupal\views\Plugin\views\filter	core/modules/views/src/Plugin/views/filter/NumericFilter.php	Simple filter to handle greater than/less than filters.	2	2
NumericFilterTest		class	Drupal\Tests\views\Unit\Plugin\views\filter	core/modules/views/tests/src/Unit/Plugin/views/filter/NumericFilterTest.php	@coversDefaultClass \Drupal\views\Plugin\views\filter\NumericFilter[[api-linebreak]] @group Views
NumericFormatPluralTest		class	Drupal\Tests\views\Functional\Plugin	core/modules/views/tests/src/Functional/Plugin/NumericFormatPluralTest.php	Tests the creation of numeric fields.
NumericFormatterBase		abstract class	Drupal\Core\Field\Plugin\Field\FieldFormatter	core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/NumericFormatterBase.php	Parent plugin for decimal and integer formatters.	2
NumericItemBase		abstract class	Drupal\Core\Field\Plugin\Field\FieldType	core/lib/Drupal/Core/Field/Plugin/Field/FieldType/NumericItemBase.php	Base class for numeric configurable field types.	3	1
NumericUnformattedFormatter		class	Drupal\Core\Field\Plugin\Field\FieldFormatter	core/lib/Drupal/Core/Field/Plugin/Field/FieldFormatter/NumericUnformattedFormatter.php	Plugin implementation of the 'number_unformatted' formatter.	1	1
ObjectAwareSerializationInterface		interface	Drupal\Component\Serialization	core/lib/Drupal/Component/Serialization/ObjectAwareSerializationInterface.php	Ensures that a serializer is usable for serializing PHP objects.	1	2
ObjectDefinition		class	Drupal\Tests\Core\Plugin	core/tests/Drupal/Tests/Core/Plugin/DefaultPluginManagerTest.php
ObjectDefinition		class	Drupal\Tests\Component\Annotation\Plugin\Discovery	core/tests/Drupal/Tests/Component/Annotation/Plugin/Discovery/AnnotationBridgeDecoratorTest.php
ObjectDefinition		class	Drupal\Tests\Component\Plugin\Discovery	core/tests/Drupal/Tests/Component/Plugin/Discovery/AttributeBridgeDecoratorTest.php
ObjectSerialization		class	Drupal\Core\Test	core/lib/Drupal/Core/Test/ObjectSerialization.php	Object to test that security issues around serialization.
ObjectWithPluginCollectionInterface		interface	Drupal\Core\Plugin	core/lib/Drupal/Core/Plugin/ObjectWithPluginCollectionInterface.php	Provides an interface for an object using a plugin collection.	1	1
ObjWithString		class	Drupal\Tests\migrate\Unit\process	core/modules/migrate/tests/src/Unit/process/LogTest.php	Test class with a __toString() method.
ObsoleteExtensionException		class	Drupal\Core\Extension\Exception	core/lib/Drupal/Core/Extension/Exception/ObsoleteExtensionException.php	Exception thrown when the extension is obsolete on install.		2
OEmbed		class	Drupal\media\Plugin\media\Source	core/modules/media/src/Plugin/media/Source/OEmbed.php	Provides a media source plugin for oEmbed resources.		1
OEmbedDeriver		class	Drupal\media\Plugin\media\Source	core/modules/media/src/Plugin/media/Source/OEmbedDeriver.php	Derives media source plugin definitions for supported oEmbed providers.
OEmbedFieldWidgetTest		class	Drupal\Tests\media\Functional\FieldWidget	core/modules/media/tests/src/Functional/FieldWidget/OEmbedFieldWidgetTest.php	@covers \Drupal\media\Plugin\Field\FieldWidget\OEmbedWidget[[api-linebreak]]
OEmbedForm		class	Drupal\media_library\Form	core/modules/media_library/src/Form/OEmbedForm.php	Creates a form to create media entities from oEmbed URLs.		2
OEmbedFormatter		class	Drupal\media\Plugin\Field\FieldFormatter	core/modules/media/src/Plugin/Field/FieldFormatter/OEmbedFormatter.php	Plugin implementation of the 'oembed' formatter.
OEmbedFormatterTest		class	Drupal\Tests\media\Functional\FieldFormatter	core/modules/media/tests/src/Functional/FieldFormatter/OEmbedFormatterTest.php	@covers \Drupal\media\Plugin\Field\FieldFormatter\OEmbedFormatter[[api-linebreak]]
OEmbedIframeController		class	Drupal\media\Controller	core/modules/media/src/Controller/OEmbedIframeController.php	Controller which renders an oEmbed resource in a bare page (without blocks).		1
OEmbedIframeControllerTest		class	Drupal\Tests\media\Kernel	core/modules/media/tests/src/Kernel/OEmbedIframeControllerTest.php	@coversDefaultClass \Drupal\media\Controller\OEmbedIframeController[[api-linebreak]]
OEmbedInterface		interface	Drupal\media\Plugin\media\Source	core/modules/media/src/Plugin/media/Source/OEmbedInterface.php	Defines additional functionality for source plugins that use oEmbed.	1	6
OEmbedMediaSource		class	Drupal\media\Attribute	core/modules/media/src/Attribute/OEmbedMediaSource.php	Defines a OEmbedMediaSource attribute.		1
OEmbedResourceConstraint		class	Drupal\media\Plugin\Validation\Constraint	core/modules/media/src/Plugin/Validation/Constraint/OEmbedResourceConstraint.php	Checks if a value represents a valid oEmbed resource URL.		1

Other projects

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