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
ExperimentalThemeTest		class	Drupal\Tests\system\Functional\Theme	core/modules/system/tests/src/Functional/Theme/ExperimentalThemeTest.php	Tests the installation of experimental themes.
Explode		class	Drupal\migrate\Plugin\migrate\process	core/modules/migrate/src/Plugin/migrate/process/Explode.php	Splits the source string into an array of strings, using a delimiter.		1
ExplodeTest		class	Drupal\Tests\migrate\Unit\process	core/modules/migrate/tests/src/Unit/process/ExplodeTest.php	Tests the Explode process plugin.
ExportForm		class	Drupal\locale\Form	core/modules/locale/src/Form/ExportForm.php	Form for the Gettext translation files export form.			1
ExportStorageManager		final class	Drupal\Core\Config	core/lib/Drupal/Core/Config/ExportStorageManager.php	The export storage manager dispatches an event for the export storage.		1	2
ExportStorageManagerTest		class	Drupal\KernelTests\Core\Config	core/tests/Drupal/KernelTests/Core/Config/ExportStorageManagerTest.php	Tests the export storage manager.
ExposedFilterAJAXTest		class	Drupal\Tests\views\FunctionalJavascript	core/modules/views/tests/src/FunctionalJavascript/ExposedFilterAJAXTest.php	Tests the basic AJAX functionality of Views exposed forms.
ExposedFormCache		class	Drupal\views	core/modules/views/src/ExposedFormCache.php	Caches exposed forms, as they are heavy to generate.		1	2
ExposedFormCheckboxesTest		class	Drupal\Tests\views\Functional\Plugin	core/modules/views/tests/src/Functional/Plugin/ExposedFormCheckboxesTest.php	Tests exposed forms functionality.
ExposedFormPluginBase		abstract class	Drupal\views\Plugin\views\exposed_form	core/modules/views/src/Plugin/views/exposed_form/ExposedFormPluginBase.php	Base class for Views exposed filter form plugins.	2
ExposedFormPluginInterface		interface	Drupal\views\Plugin\views\exposed_form	core/modules/views/src/Plugin/views/exposed_form/ExposedFormPluginInterface.php	Interface for exposed filter form plugins.	1	1	1
ExposedFormRenderTest		class	Drupal\Tests\views\Kernel\Plugin	core/modules/views/tests/src/Kernel/Plugin/ExposedFormRenderTest.php	Tests the exposed form.
ExposedFormTest		class	Drupal\Tests\views\Functional\Plugin	core/modules/views/tests/src/Functional/Plugin/ExposedFormTest.php	Tests exposed forms functionality.
ExposedFormUITest		class	Drupal\Tests\views_ui\Functional	core/modules/views_ui/tests/src/Functional/ExposedFormUITest.php	Tests exposed forms UI functionality.
ExtendableInterface		interface	Drupal\Core\Database\Query	core/lib/Drupal/Core/Database/Query/ExtendableInterface.php	Interface for extendable query objects.	1
ExtendedDiscoveryInterface		interface	Drupal\Tests\Component\Plugin\Discovery	core/tests/Drupal/Tests/Component/Plugin/Discovery/AttributeBridgeDecoratorTest.php
ExtendedForm		class	Drupal\install_form_test\Form	core/modules/system/tests/modules/install_form_test/src/Form/ExtendedForm.php	Extends the site setting form.			1
ExtendingNonInstalledClass		class	Drupal\plugin_test\Plugin\plugin_test\fruit	core/modules/system/tests/modules/plugin_test/src/Plugin/plugin_test/fruit/ExtendingNonInstalledClass.php	Plugin annotation @Plugin( id = "extending_non_installed_class", label = "A plugin whose class is extending from a non-installed module class", color = "pink", )
ExtendingNonInstalledClass		class	Drupal\plugin_test\Plugin\plugin_test\custom_annotation	core/modules/system/tests/modules/plugin_test/src/Plugin/plugin_test/custom_annotation/ExtendingNonInstalledClass.php	This class does not have a plugin attribute or plugin annotation on purpose.
Extension		class	Drupal\system\Plugin\migrate\source	core/modules/system/src/Plugin/migrate/source/Extension.php	Drupal 6/7 system data for a legacy extension source from database.
Extension		class	Drupal\Core\Extension	core/lib/Drupal/Core/Extension/Extension.php	Defines an extension (file) object.	1	42
ExtensionDiscovery		class	Drupal\Core\Extension	core/lib/Drupal/Core/Extension/ExtensionDiscovery.php	Discovers available extensions in the filesystem.		20
ExtensionDiscoveryTest		class	Drupal\Tests\Core\Extension	core/tests/Drupal/Tests/Core/Extension/ExtensionDiscoveryTest.php	Tests discovery of extensions.
ExtensionExistsConstraint		class	Drupal\Core\Extension\Plugin\Validation\Constraint	core/lib/Drupal/Core/Extension/Plugin/Validation/Constraint/ExtensionExistsConstraint.php	Checks that the value is the name of an installed extension.
ExtensionExistsConstraintValidator		class	Drupal\Core\Extension\Plugin\Validation\Constraint	core/lib/Drupal/Core/Extension/Plugin/Validation/Constraint/ExtensionExistsConstraintValidator.php	Validates that a given extension exists.
ExtensionExistsConstraintValidatorTest		class	Drupal\KernelTests\Core\Extension	core/tests/Drupal/KernelTests/Core/Extension/ExtensionExistsConstraintValidatorTest.php	Tests the ExtensionExists constraint validator.
ExtensionInstallStorage		class	Drupal\Core\Config	core/lib/Drupal/Core/Config/ExtensionInstallStorage.php	Storage to access configuration and schema in enabled extensions.		2	2
ExtensionInstallStorageTest		class	Drupal\Tests\Core\Config	core/tests/Drupal/Tests/Core/Config/ExtensionInstallStorageTest.php	@coversDefaultClass \Drupal\Core\Config\ExtensionInstallStorage[[api-linebreak]] @group Config
ExtensionLifecycle		final class	Drupal\Core\Extension	core/lib/Drupal/Core/Extension/ExtensionLifecycle.php	Extension lifecycle.		18
ExtensionList		abstract class	Drupal\Core\Extension	core/lib/Drupal/Core/Extension/ExtensionList.php	Provides available extensions.	6	2
ExtensionListTest		class	Drupal\Tests\Core\Extension	core/tests/Drupal/Tests/Core/Extension/ExtensionListTest.php	@coversDefaultClass \Drupal\Core\Extension\ExtensionList[[api-linebreak]] @group Extension
ExtensionListTestTrait		trait	Drupal\Tests	core/tests/Drupal/Tests/ExtensionListTestTrait.php	Provides extension list methods.		2
ExtensionListTrait		trait	Drupal\Core\Installer	core/lib/Drupal/Core/Installer/ExtensionListTrait.php	Provides common functionality for the extension list classes.
ExtensionMimeTypeGuesser		class	Drupal\Core\File\MimeType	core/lib/Drupal/Core/File/MimeType/ExtensionMimeTypeGuesser.php	Makes possible to guess the MIME type of a file using its extension.			2
ExtensionMimeTypeGuesser		class	Drupal\Core\ProxyClass\File\MimeType	core/lib/Drupal/Core/ProxyClass/File/MimeType/ExtensionMimeTypeGuesser.php	Provides a proxy class for \Drupal\Core\File\MimeType\ExtensionMimeTypeGuesser.
ExtensionNameConstraint		class	Drupal\Core\Extension\Plugin\Validation\Constraint	core/lib/Drupal/Core/Extension/Plugin/Validation/Constraint/ExtensionNameConstraint.php	Checks that the value is a valid extension name.
ExtensionNameConstraintTest		class	Drupal\KernelTests\Core\Extension	core/tests/Drupal/KernelTests/Core/Extension/ExtensionNameConstraintTest.php	Tests the ExtensionName constraint.
ExtensionNameLengthException		class	Drupal\Core\Extension	core/lib/Drupal/Core/Extension/ExtensionNameLengthException.php	Exception thrown when the extension's name length exceeds the allowed maximum.		2
ExtensionNameReservedException		class	Drupal\Core\Extension	core/lib/Drupal/Core/Extension/ExtensionNameReservedException.php	Exception thrown when the extension's name is already reserved.		2
ExtensionPathResolver		class	Drupal\Core\Extension	core/lib/Drupal/Core/Extension/ExtensionPathResolver.php	Factory for getting extension lists by type.		5	2
ExtensionPathResolverTest		class	Drupal\KernelTests\Core\Bootstrap	core/tests/Drupal/KernelTests/Core/Bootstrap/ExtensionPathResolverTest.php	Tests that extension path resolver works correctly.
ExtensionSerializationTest		class	Drupal\Tests\Core\Extension	core/tests/Drupal/Tests/Core/Extension/ExtensionSerializationTest.php	Tests Extension serialization.
ExtensionTest		class	Drupal\Tests\system\Kernel\Plugin\migrate\source	core/modules/system/tests/src/Kernel/Plugin/migrate/source/ExtensionTest.php	Tests legacy extension source plugin.
ExtensionVersion		final class	Drupal\Core\Extension	core/lib/Drupal/Core/Extension/ExtensionVersion.php	Provides an extension version value object.		5
ExtensionVersionTest		class	Drupal\Tests\Core\Extension	core/tests/Drupal/Tests/Core/Extension/ExtensionVersionTest.php	@coversDefaultClass \Drupal\Core\Extension\ExtensionVersion[[api-linebreak]]
ExtensionViewsFieldTest		class	Drupal\Tests\file\Kernel\Views	core/modules/file/tests/src/Kernel/Views/ExtensionViewsFieldTest.php	Tests the core Drupal\file\Plugin\views\field\Extension handler.
ExternalCommandRequirementsTrait	in drupal:10.2.0 and is removed from drupal:11.0.0. Use Drupal\\TestTools\\Extension\\RequiresComposerTrait instead.	trait	Drupal\BuildTests\Framework	core/tests/Drupal/BuildTests/Framework/ExternalCommandRequirementsTrait.php	Allows test classes to require external command line applications.		1
ExternalCommandRequirementTest		class	Drupal\BuildTests\Framework\Tests	core/tests/Drupal/BuildTests/Framework/Tests/ExternalCommandRequirementTest.php	@coversDefaultClass \Drupal\BuildTests\Framework\ExternalCommandRequirementsTrait[[api-linebreak]] @group Build @group legacy
ExternalFormUrlTest		class	Drupal\KernelTests\Core\Form	core/tests/Drupal/KernelTests/Core/Form/ExternalFormUrlTest.php	Ensures that form actions can't be tricked into sending to external URLs.
ExternalNormalizersTest		class	Drupal\Tests\jsonapi\Functional	core/modules/jsonapi/tests/src/Functional/ExternalNormalizersTest.php	Asserts external normalizers are handled as expected by the JSON:API module.

Other projects

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