You are here

Classes, traits, and interfaces in Drupal 8

Primary tabs

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
ComposerIntegrationTrait	trait	Drupal\Tests\Composer	core/tests/Drupal/Tests/Composer/ComposerIntegrationTrait.php	Some utility functions for testing the Composer integration.		2
ComposerProjectTemplatesTest	class	Drupal\BuildTests\Composer\Template	core/tests/Drupal/BuildTests/Composer/Template/ComposerProjectTemplatesTest.php	Demonstrate that Composer project templates are buildable as patched.
ComposerScaffoldCommand	class	Drupal\Composer\Plugin\Scaffold	composer/Plugin/Scaffold/ComposerScaffoldCommand.php	The "drupal:scaffold" command class.
ComposerTest	class	Drupal\Tests\Composer	core/tests/Drupal/Tests/Composer/ComposerTest.php	@coversDefaultClass \Drupal\Composer\Composer @group Composer
ComposerValidateTest	class	Drupal\BuildTests\Composer	core/tests/Drupal/BuildTests/Composer/ComposerValidateTest.php	@group Composer @requires externalCommand composer
CompositeConstraintBase	abstract class	Drupal\Core\Entity\Plugin\Validation\Constraint	core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/CompositeConstraintBase.php	Provides a base class for constraints validating multiple fields.	4	6
CompositeFormElementTrait	trait	Drupal\Core\Render\Element	core/lib/Drupal/Core/Render/Element/CompositeFormElementTrait.php	Provides a trait for radios, checkboxes, and similar composite form elements.
ComputedFieldTest	class	Drupal\Tests\views\Kernel\Handler	core/modules/views/tests/src/Kernel/Handler/ComputedFieldTest.php	Provides some integration tests for the Field handler.
ComputedFileUrl	class	Drupal\file	core/modules/file/src/ComputedFileUrl.php	Computed file URL property class.		2
ComputedFileUrlTest	class	Drupal\Tests\file\Kernel	core/modules/file/tests/src/Kernel/ComputedFileUrlTest.php	@coversDefaultClass \Drupal\file\ComputedFileUrl
ComputedItemListTrait	trait	Drupal\Core\TypedData	core/lib/Drupal/Core/TypedData/ComputedItemListTrait.php	Provides common functionality for computed item lists.		4
ComputedReferenceTestFieldItemList	class	Drupal\entity_test\Plugin\Field	core/modules/system/tests/modules/entity_test/src/Plugin/Field/ComputedReferenceTestFieldItemList.php	A computed entity reference field item list.		1
ComputedString	class	Drupal\entity_test\TypedData	core/modules/system/tests/modules/entity_test/src/TypedData/ComputedString.php	A computed property for test strings.		1
ComputedTestFieldItemList	class	Drupal\entity_test\Plugin\Field	core/modules/system/tests/modules/entity_test/src/Plugin/Field/ComputedTestFieldItemList.php	A computed field item list.		1
Concat	class	Drupal\migrate\Plugin\migrate\process	core/modules/migrate/src/Plugin/migrate/process/Concat.php	Concatenates a set of strings.	1	2
ConcatTest	class	Drupal\Tests\migrate\Unit\process	core/modules/migrate/tests/src/Unit/process/ConcatTest.php	Tests the concat process plugin.
Condition	class	Drupal\Core\Condition\Annotation	core/lib/Drupal/Core/Condition/Annotation/Condition.php	Defines a condition plugin annotation object.
Condition	class	Drupal\Core\Database\Query	core/lib/Drupal/Core/Database/Query/Condition.php	Generic class for a series of conditions in a query.		35
Condition	class	Drupal\Core\Config\Entity\Query	core/lib/Drupal/Core/Config/Entity/Query/Condition.php	Defines the condition class for the config entity query.	1	1
Condition	class	Drupal\Core\Entity\KeyValueStore\Query	core/lib/Drupal/Core/Entity/KeyValueStore/Query/Condition.php	Defines the condition class for the key value entity query.
Condition	class	Drupal\Core\Entity\Query\Sql	core/lib/Drupal/Core/Entity/Query/Sql/Condition.php	Implements entity query conditions for SQL databases.	1	1
Condition	class	Drupal\Core\Entity\Query\Null	core/lib/Drupal/Core/Entity/Query/Null/Condition.php	Defines the condition class for the null entity query.
Condition	class	Drupal\Core\Entity\Query\Sql\pgsql	core/lib/Drupal/Core/Entity/Query/Sql/pgsql/Condition.php	Implements entity query conditions for PostgreSQL databases.
ConditionAccessResolverTrait	trait	Drupal\Core\Condition	core/lib/Drupal/Core/Condition/ConditionAccessResolverTrait.php	Resolves a set of conditions.		1
ConditionAccessResolverTraitTest	class	Drupal\Tests\Core\Condition	core/tests/Drupal/Tests/Core/Condition/ConditionAccessResolverTraitTest.php	@coversDefaultClass \Drupal\Core\Condition\ConditionAccessResolverTrait @group Condition
ConditionAggregate	class	Drupal\Core\Entity\Query\Sql	core/lib/Drupal/Core/Entity/Query/Sql/ConditionAggregate.php	Defines the aggregate condition for sql based storage.		1
ConditionAggregateBase	abstract class	Drupal\Core\Entity\Query	core/lib/Drupal/Core/Entity/Query/ConditionAggregateBase.php	Defines a common base class for all aggregation entity condition implementations.	1	1
ConditionAggregateInterface	interface	Drupal\Core\Entity\Query	core/lib/Drupal/Core/Entity/Query/ConditionAggregateInterface.php	Defines aggregated entity query conditions.	1	1
ConditionBase	abstract class	Drupal\Core\Entity\Query	core/lib/Drupal/Core/Entity/Query/ConditionBase.php	Defines a common base class for all entity condition implementations.	3	3
ConditionFormTest	class	Drupal\Tests\system\Functional\Condition	core/modules/system/tests/src/Functional/Condition/ConditionFormTest.php	Tests that condition plugins basic form handling is working.
ConditionFundamentals	abstract class	Drupal\Core\Entity\Query	core/lib/Drupal/Core/Entity/Query/ConditionFundamentals.php	Common code for all implementations of the entity query condition interfaces.	2
ConditionInterface	interface	Drupal\Core\Condition	core/lib/Drupal/Core/Condition/ConditionInterface.php	An interface for condition plugins.	1
ConditionInterface	interface	Drupal\Core\Entity\Query	core/lib/Drupal/Core/Entity/Query/ConditionInterface.php	Defines the entity query condition interface.	1	2
ConditionInterface	interface	Drupal\Core\Database\Query	core/lib/Drupal/Core/Database/Query/ConditionInterface.php	Interface for a conditional clause in a query.	5	2
ConditionManager	class	Drupal\Core\Condition	core/lib/Drupal/Core/Condition/ConditionManager.php	A plugin manager for condition plugins.		1	2
ConditionPluginBase	abstract class	Drupal\Core\Condition	core/lib/Drupal/Core/Condition/ConditionPluginBase.php	Provides a basis for fulfilling contexts for condition plugins.	10	10
ConditionPluginCollection	class	Drupal\Core\Condition	core/lib/Drupal/Core/Condition/ConditionPluginCollection.php	Provides a collection of condition plugins.		1
ConditionTest	class	Drupal\Tests\Core\Database	core/tests/Drupal/Tests/Core/Database/ConditionTest.php	@coversDefaultClass \Drupal\Core\Database\Query\Condition
ConditionTestDualUser	class	Drupal\condition_test\Plugin\Condition	core/modules/system/tests/modules/condition_test/src/Plugin/Condition/ConditionTestDualUser.php	Provides a condition that requires two users.
ConditionTestDualUserTest	class	Drupal\KernelTests\Core\Plugin\Condition	core/tests/Drupal/KernelTests/Core/Plugin/Condition/ConditionTestDualUserTest.php	Tests a condition that requires two users.
ConditionTestNoExistingType	class	Drupal\condition_test\Plugin\Condition	core/modules/system/tests/modules/condition_test/src/Plugin/Condition/ConditionTestNoExistingType.php	Provides a condition that has a no existing context.
Config	class	Drupal\Composer\Plugin\VendorHardening	composer/Plugin/VendorHardening/Config.php	Determine configuration.		2
Config	class	Drupal\Core\Config	core/lib/Drupal/Core/Config/Config.php	Defines the default configuration object.	1	26
Config	class	Drupal\migrate\Plugin\migrate\destination	core/modules/migrate/src/Plugin/migrate/destination/Config.php	Provides Configuration Management destination plugin.	1	4
Config	class	Drupal\migrate_drupal\Plugin\migrate\source\d8	core/modules/migrate_drupal/src/Plugin/migrate/source/d8/Config.php	Drupal config source from database.
ConfigAccessTest	class	Drupal\Tests\settings_tray\FunctionalJavascript	core/modules/settings_tray/tests/src/FunctionalJavascript/ConfigAccessTest.php	Tests handling of configuration overrides.
ConfigAfterInstallerTestBase	abstract class	Drupal\FunctionalTests\Installer	core/tests/Drupal/FunctionalTests/Installer/ConfigAfterInstallerTestBase.php	Provides a class for install profiles to check their installed config.	2
ConfigAfterInstallerTestBase Deprecated	abstract class	Drupal\system\Tests\Installer	core/modules/system/src/Tests/Installer/ConfigAfterInstallerTestBase.php	Provides a class for install profiles to check their installed config.
ConfigBase	abstract class	Drupal\Core\Config	core/lib/Drupal/Core/Config/ConfigBase.php	Provides a base class for configuration objects with get/set support.	2	2
ConfigCacheTag	class	Drupal\system\EventSubscriber	core/modules/system/src/EventSubscriber/ConfigCacheTag.php	A subscriber invalidating cache tags when system config objects are saved.			2

Pages

Other projects

Uncaught exception thrown in session handler.

PDOException: SQLSTATE[HY000]: General error: 1114 The table 'sessions' is full: INSERT INTO {sessions} (sid, ssid, uid, cache, hostname, session, timestamp) VALUES (:db_insert_placeholder_0, :db_insert_placeholder_1, :db_insert_placeholder_2, :db_insert_placeholder_3, :db_insert_placeholder_4, :db_insert_placeholder_5, :db_insert_placeholder_6); Array ( [:db_insert_placeholder_0] => AQHSCRUXTC_VaQ2nn6bRaT_l562apnD6nsAFYhqUnUQ [:db_insert_placeholder_1] => AQHSCRUXTC_VaQ2nn6bRaT_l562apnD6nsAFYhqUnUQ [:db_insert_placeholder_2] => 0 [:db_insert_placeholder_3] => 0 [:db_insert_placeholder_4] => 216.73.217.130 [:db_insert_placeholder_5] => messages|a:1:{s:5:"error";a:2:{i:0;s:318:"<em class="placeholder">Notice</em>: file_put_contents(): write of 8192 bytes failed with errno=28 No space left on device in <em class="placeholder">boost_write_file()</em> (line <em class="placeholder">1374</em> of <em class="placeholder">/home/drupalhelp/live/web/sites/all/modules/contrib/boost/boost.module</em>).";i:1;s:318:"<em class="placeholder">Warning</em>: file_put_contents(): Only -1 of 83759 bytes written, possibly out of free disk space in <em class="placeholder">boost_write_file()</em> (line <em class="placeholder">1374</em> of <em class="placeholder">/home/drupalhelp/live/web/sites/all/modules/contrib/boost/boost.module</em>).";}} [:db_insert_placeholder_6] => 1794421371 ) in _drupal_session_write() (line 209 of /home/drupalhelp/live/web/includes/session.inc).