Yii PHP Framework Version 2

This is the core framework code of Yii 2.

This repository is a read-only git subsplit of https://github.com/yiisoft/yii2. Please submit issue reports and pull requests to the main repository. For license information check the LICENSE-file.

Installation

The preferred way to install the Yii framework is through composer.

Either run

composer global require "fxp/composer-asset-plugin:^1.3.1"
composer require yiisoft/yii2

or add

"yiisoft/yii2": "~2.0.0",

to the require section of your composer.json.

Class Reference

Class	Description
Yii	Yii is a helper class serving common framework functionalities.
YiiRequirementChecker	YiiRequirementChecker allows checking, if current system meets the requirements for running the Yii application.
yii\BaseYii	BaseYii is the core helper class for the Yii framework.
yii\base\Action	Action is the base class for all controller action classes.
yii\base\ActionEvent	ActionEvent represents the event parameter used for an action event.
yii\base\ActionFilter	ActionFilter is the base class for action filters.
yii\base\Application	Application is the base class for all application classes.
yii\base\ArrayAccessTrait	ArrayAccessTrait provides the implementation for IteratorAggregate, ArrayAccess and Countable.
yii\base\Arrayable	Arrayable is the interface that should be implemented by classes who want to support customizable representation of their instances.
yii\base\ArrayableTrait	ArrayableTrait provides a common implementation of the yii\base\Arrayable interface.
yii\base\Behavior	Behavior is the base class for all behavior classes.
yii\base\BootstrapInterface	BootstrapInterface is the interface that should be implemented by classes who want to participate in the application bootstrap process.
yii\base\Component	Component is the base class that implements the property, event and behavior features.
yii\base\Configurable	Configurable is the interface that should be implemented by classes who support configuring its properties through the last parameter to its constructor.
yii\base\Controller	Controller is the base class for classes containing controller logic.
yii\base\DynamicModel	DynamicModel is a model class primarily used to support ad hoc data validation.
yii\base\ErrorException	ErrorException represents a PHP error.
yii\base\ErrorHandler	ErrorHandler handles uncaught PHP errors and exceptions.
yii\base\Event	Event is the base class for all event classes.
yii\base\Exception	Exception represents a generic exception for all purposes.
yii\base\ExitException	ExitException represents a normal termination of an application.
yii\base\InlineAction	InlineAction represents an action that is defined as a controller method.
yii\base\InvalidCallException	InvalidCallException represents an exception caused by calling a method in a wrong way.
yii\base\InvalidConfigException	InvalidConfigException represents an exception caused by incorrect object configuration.
yii\base\InvalidParamException	InvalidParamException represents an exception caused by invalid parameters passed to a method.
yii\base\InvalidRouteException	InvalidRouteException represents an exception caused by an invalid route.
yii\base\InvalidValueException	InvalidValueException represents an exception caused by a function returning a value of unexpected type.
yii\base\Model	Model is the base class for data models.
yii\base\ModelEvent	ModelEvent represents the parameter needed by yii\base\Model events.
yii\base\Module	Module is the base class for module and application classes.
yii\base\NotSupportedException	NotSupportedException represents an exception caused by accessing features that are not supported.
yii\base\Object	Object is the base class that implements the property feature.
yii\base\Request	Request represents a request that is handled by an yii\base\Application.
yii\base\Response	Response represents the response of an yii\base\Application to a yii\base\Request.
yii\base\Security	Security provides a set of methods to handle common security-related tasks.
yii\base\Theme	Theme represents an application theme.
yii\base\UnknownClassException	UnknownClassException represents an exception caused by using an unknown class.
yii\base\UnknownMethodException	UnknownMethodException represents an exception caused by accessing an unknown object method.
yii\base\UnknownPropertyException	UnknownPropertyException represents an exception caused by accessing unknown object properties.
yii\base\UserException	UserException is the base class for exceptions that are meant to be shown to end users.
yii\base\View	View represents a view object in the MVC pattern.
yii\base\ViewContextInterface	ViewContextInterface is the interface that should implemented by classes who want to support relative view names.
yii\base\ViewEvent	ViewEvent represents events triggered by the yii\base\View component.
yii\base\ViewNotFoundException	ViewNotFoundException represents an exception caused by view file not found.
yii\base\ViewRenderer	ViewRenderer is the base class for view renderer classes.
yii\base\Widget	Widget is the base class for widgets.
yii\base\WidgetEvent	WidgetEvent represents the event parameter used for a widget event.
yii\behaviors\AttributeBehavior	AttributeBehavior automatically assigns a specified value to one or multiple attributes of an ActiveRecord object when certain events happen.
yii\behaviors\AttributeTypecastBehavior	AttributeTypecastBehavior provides an ability of automatic model attribute typecasting.
yii\behaviors\BlameableBehavior	BlameableBehavior automatically fills the specified attributes with the current user ID.
yii\behaviors\SluggableBehavior	SluggableBehavior automatically fills the specified attribute with a value that can be used a slug in a URL.
yii\behaviors\TimestampBehavior	TimestampBehavior automatically fills the specified attributes with the current timestamp.
yii\caching\ApcCache	ApcCache provides APC caching in terms of an application component.
yii\caching\ArrayCache	ArrayCache provides caching for the current request only by storing the values in an array.
yii\caching\Cache	Cache is the base class for cache classes supporting different cache storage implementations.
yii\caching\CacheInterface	CacheInterface is the base interface for cache.
yii\caching\ChainedDependency	ChainedDependency represents a dependency which is composed of a list of other dependencies.
yii\caching\DbCache	DbCache implements a cache application component by storing cached data in a database.
yii\caching\DbDependency	DbDependency represents a dependency based on the query result of a SQL statement.
yii\caching\DbQueryDependency	DbQueryDependency represents a dependency based on the query result of an yii\db\QueryInterface instance.
yii\caching\Dependency	Dependency is the base class for cache dependency classes.
yii\caching\DummyCache	DummyCache is a placeholder cache component.
yii\caching\ExpressionDependency	ExpressionDependency represents a dependency based on the result of a PHP expression.
yii\caching\FileCache	FileCache implements a cache component using files.
yii\caching\FileDependency	FileDependency represents a dependency based on a file's last modification time.
yii\caching\MemCache	MemCache implements a cache application component based on memcache and memcached.
yii\caching\MemCacheServer	MemCacheServer represents the configuration data for a single memcache or memcached server.
yii\caching\TagDependency	TagDependency associates a cached data item with one or multiple $tags.
yii\caching\WinCache	WinCache provides Windows Cache caching in terms of an application component.
yii\caching\XCache	XCache provides XCache caching in terms of an application component.
yii\caching\ZendDataCache	ZendDataCache provides Zend data caching in terms of an application component.
yii\captcha\Captcha	Captcha renders a CAPTCHA image and an input field that takes user-entered verification code.
yii\captcha\CaptchaAction	CaptchaAction renders a CAPTCHA image.
yii\captcha\CaptchaAsset	This asset bundle provides the javascript files needed for the yii\captcha\Captcha widget.
yii\captcha\CaptchaValidator	CaptchaValidator validates that the attribute value is the same as the verification code displayed in the CAPTCHA.
yii\console\Application	Application represents a console application.
yii\console\Controller	Controller is the base class of console command classes.
yii\console\ErrorHandler	ErrorHandler handles uncaught PHP errors and exceptions.
yii\console\Exception	Exception represents an exception caused by incorrect usage of a console command.
yii\console\Markdown	A Markdown parser that enhances markdown for reading in console environments.
yii\console\Request	The console Request represents the environment information for a console application.
yii\console\Response	The console Response represents the result of a console application.
yii\console\UnknownCommandException	UnknownCommandException represents an exception caused by incorrect usage of a console command.
yii\console\controllers\AssetController	Allows you to combine and compress your JavaScript and CSS files.
yii\console\controllers\BaseMigrateController	BaseMigrateController is the base class for migrate controllers.
yii\console\controllers\CacheController	Allows you to flush cache.
yii\console\controllers\FixtureController	Manages fixture data loading and unloading.
yii\console\controllers\HelpController	Provides help information about console commands.
yii\console\controllers\MessageController	Extracts messages to be translated from source files.
yii\console\controllers\MigrateController	Manages application migrations.
yii\console\controllers\ServeController	Runs PHP built-in web server
yii\data\ActiveDataProvider	ActiveDataProvider implements a data provider based on yii\db\Query and yii\db\ActiveQuery.
yii\data\ArrayDataProvider	ArrayDataProvider implements a data provider based on a data array.
yii\data\BaseDataProvider	BaseDataProvider provides a base class that implements the yii\data\DataProviderInterface.
yii\data\DataProviderInterface	DataProviderInterface is the interface that must be implemented by data provider classes.
yii\data\Pagination	Pagination represents information relevant to pagination of data items.
yii\data\Sort	Sort represents information relevant to sorting.
yii\data\SqlDataProvider	SqlDataProvider implements a data provider based on a plain SQL statement.
yii\db\ActiveQuery	ActiveQuery represents a DB query associated with an Active Record class.
yii\db\ActiveQueryInterface	ActiveQueryInterface defines the common interface to be implemented by active record query classes.
yii\db\ActiveQueryTrait	ActiveQueryTrait implements the common methods and properties for active record query classes.
yii\db\ActiveRecord	ActiveRecord is the base class for classes representing relational data in terms of objects.
yii\db\ActiveRecordInterface	ActiveRecordInterface
yii\db\ActiveRelationTrait	ActiveRelationTrait implements the common methods and properties for active record relational queries.
yii\db\AfterSaveEvent	AfterSaveEvent represents the information available in yii\db\ActiveRecord::EVENT_AFTER_INSERT and yii\db\ActiveRecord::EVENT_AFTER_UPDATE.
yii\db\BaseActiveRecord	ActiveRecord is the base class for classes representing relational data in terms of objects.
yii\db\BatchQueryResult	BatchQueryResult represents a batch query from which you can retrieve data in batches.
yii\db\ColumnSchema	ColumnSchema class describes the metadata of a column in a database table.
yii\db\ColumnSchemaBuilder	ColumnSchemaBuilder helps to define database schema types using a PHP interface.
yii\db\Command	Command represents a SQL statement to be executed against a database.
yii\db\Connection	Connection represents a connection to a database via PDO.
yii\db\DataReader	DataReader represents a forward-only stream of rows from a query result set.
yii\db\Exception	Exception represents an exception that is caused by some DB-related operations.
yii\db\Expression	Expression represents a DB expression that does not need escaping or quoting.
yii\db\IntegrityException	Exception represents an exception that is caused by violation of DB constraints.
yii\db\Migration	Migration is the base class for representing a database migration.
yii\db\MigrationInterface	The MigrationInterface defines the minimum set of methods to be implemented by a database migration.
yii\db\Query	Query represents a SELECT SQL statement in a way that is independent of DBMS.
yii\db\QueryBuilder	QueryBuilder builds a SELECT SQL statement based on the specification given as a yii\db\Query object.
yii\db\QueryInterface	The QueryInterface defines the minimum set of methods to be implemented by a database query.
yii\db\QueryTrait	The BaseQuery trait represents the minimum method set of a database Query.
yii\db\Schema	Schema is the base class for concrete DBMS-specific schema classes.
yii\db\SchemaBuilderTrait	SchemaBuilderTrait contains shortcut methods to create instances of yii\db\ColumnSchemaBuilder.
yii\db\StaleObjectException
yii\db\TableSchema	TableSchema represents the metadata of a database table.
yii\db\Transaction	Transaction represents a DB transaction.
yii\db\ViewFinderTrait	ViewFinderTrait implements the method getViewNames for finding views in a database.
yii\db\cubrid\ColumnSchemaBuilder	ColumnSchemaBuilder is the schema builder for Cubrid databases.
yii\db\cubrid\QueryBuilder	QueryBuilder is the query builder for CUBRID databases (version 9.3.x and higher).
yii\db\cubrid\Schema	Schema is the class for retrieving metadata from a CUBRID database (version 9.3.x and higher).
yii\db\mssql\PDO	This is an extension of the default PDO class of MSSQL and DBLIB drivers.
yii\db\mssql\QueryBuilder	QueryBuilder is the query builder for MS SQL Server databases (version 2008 and above).
yii\db\mssql\Schema	Schema is the class for retrieving metadata from a MS SQL Server databases (version 2008 and above).
yii\db\mssql\SqlsrvPDO	This is an extension of the default PDO class of SQLSRV driver.
yii\db\mssql\TableSchema	TableSchema represents the metadata of a database table.
yii\db\mysql\ColumnSchemaBuilder	ColumnSchemaBuilder is the schema builder for MySQL databases.
yii\db\mysql\QueryBuilder	QueryBuilder is the query builder for MySQL databases.
yii\db\mysql\Schema	Schema is the class for retrieving metadata from a MySQL database (version 4.1.x and 5.x).
yii\db\oci\ColumnSchemaBuilder	ColumnSchemaBuilder is the schema builder for Oracle databases.
yii\db\oci\QueryBuilder	QueryBuilder is the query builder for Oracle databases.
yii\db\oci\Schema	Schema is the class for retrieving metadata from an Oracle database
yii\db\pgsql\QueryBuilder	QueryBuilder is the query builder for PostgreSQL databases.
yii\db\pgsql\Schema	Schema is the class for retrieving metadata from a PostgreSQL database (version 9.x and above).
yii\db\sqlite\ColumnSchemaBuilder	ColumnSchemaBuilder is the schema builder for Sqlite databases.
yii\db\sqlite\QueryBuilder	QueryBuilder is the query builder for SQLite databases.
yii\db\sqlite\Schema	Schema is the class for retrieving metadata from a SQLite (2/3) database.
yii\di\Container	Container implements a dependency injection container.
yii\di\Instance	Instance represents a reference to a named object in a dependency injection (DI) container or a service locator.
yii\di\NotInstantiableException	NotInstantiableException represents an exception caused by incorrect dependency injection container configuration or usage.
yii\di\ServiceLocator	ServiceLocator implements a service locator.
yii\filters\AccessControl	AccessControl provides simple access control based on a set of rules.
yii\filters\AccessRule	This class represents an access rule defined by the yii\filters\AccessControl action filter
yii\filters\ContentNegotiator	ContentNegotiator supports response format negotiation and application language negotiation.
yii\filters\Cors	Cors filter implements Cross Origin Resource Sharing.
yii\filters\HostControl	HostControl provides simple control over requested host name.
yii\filters\HttpCache	HttpCache implements client-side caching by utilizing the Last-Modified and ETag HTTP headers.
yii\filters\PageCache	PageCache implements server-side caching of whole pages.
yii\filters\RateLimitInterface	RateLimitInterface is the interface that may be implemented by an identity object to enforce rate limiting.
yii\filters\RateLimiter	RateLimiter implements a rate limiting algorithm based on the leaky bucket algorithm.
yii\filters\VerbFilter	VerbFilter is an action filter that filters by HTTP request methods.
yii\filters\auth\AuthInterface	AuthInterface is the interface that should be implemented by auth method classes.
yii\filters\auth\AuthMethod	AuthMethod is a base class implementing the yii\filters\auth\AuthInterface interface.
yii\filters\auth\CompositeAuth	CompositeAuth is an action filter that supports multiple authentication methods at the same time.
yii\filters\auth\HttpBasicAuth	HttpBasicAuth is an action filter that supports the HTTP Basic authentication method.
yii\filters\auth\HttpBearerAuth	HttpBearerAuth is an action filter that supports the authentication method based on HTTP Bearer token.
yii\filters\auth\QueryParamAuth	QueryParamAuth is an action filter that supports the authentication based on the access token passed through a query parameter.
yii\grid\ActionColumn	ActionColumn is a column for the yii\grid\GridView widget that displays buttons for viewing and manipulating the items.
yii\grid\CheckboxColumn	CheckboxColumn displays a column of checkboxes in a grid view.
yii\grid\Column	Column is the base class of all yii\grid\GridView column classes.
yii\grid\DataColumn	DataColumn is the default column type for the yii\grid\GridView widget.
yii\grid\GridView	The GridView widget is used to display data in a grid.
yii\grid\GridViewAsset	This asset bundle provides the javascript files for the yii\grid\GridView widget.
yii\grid\RadioButtonColumn	RadioButtonColumn displays a column of radio buttons in a grid view.
yii\grid\SerialColumn	SerialColumn displays a column of row numbers (1-based).
yii\helpers\ArrayHelper	ArrayHelper provides additional array functionality that you can use in your application.
yii\helpers\BaseArrayHelper	BaseArrayHelper provides concrete implementation for yii\helpers\ArrayHelper.
yii\helpers\BaseConsole	BaseConsole provides concrete implementation for yii\helpers\Console.
yii\helpers\BaseFileHelper	BaseFileHelper provides concrete implementation for yii\helpers\FileHelper.
yii\helpers\BaseFormatConverter	BaseFormatConverter provides concrete implementation for yii\helpers\FormatConverter.
yii\helpers\BaseHtml	BaseHtml provides concrete implementation for yii\helpers\Html.
yii\helpers\BaseHtmlPurifier	BaseHtmlPurifier provides concrete implementation for yii\helpers\HtmlPurifier.
yii\helpers\BaseInflector	BaseInflector provides concrete implementation for yii\helpers\Inflector.
yii\helpers\BaseJson	BaseJson provides concrete implementation for yii\helpers\Json.
yii\helpers\BaseMarkdown	BaseMarkdown provides concrete implementation for yii\helpers\Markdown.
yii\helpers\BaseStringHelper	BaseStringHelper provides concrete implementation for yii\helpers\StringHelper.
yii\helpers\BaseUrl	BaseUrl provides concrete implementation for yii\helpers\Url.
yii\helpers\BaseVarDumper	BaseVarDumper provides concrete implementation for yii\helpers\VarDumper.
yii\helpers\Console	Console helper provides useful methods for command line related tasks such as getting input or formatting and coloring output.
yii\helpers\FileHelper	File system helper
yii\helpers\FormatConverter	FormatConverter provides functionality to convert between different formatting pattern formats.
yii\helpers\Html	Html provides a set of static methods for generating commonly used HTML tags.
yii\helpers\HtmlPurifier	HtmlPurifier provides an ability to clean up HTML from any harmful code.
yii\helpers\Inflector	Inflector pluralizes and singularizes English nouns. It also contains some other useful methods.
yii\helpers\Json	Json is a helper class providing JSON data encoding and decoding.
yii\helpers\Markdown	Markdown provides an ability to transform markdown into HTML.
yii\helpers\ReplaceArrayValue	Object that represents the replacement of array value while performing yii\helpers\ArrayHelper::merge().
yii\helpers\StringHelper	StringHelper
yii\helpers\UnsetArrayValue	Object that represents the removal of array value while performing yii\helpers\ArrayHelper::merge().
yii\helpers\Url	Url provides a set of static methods for managing URLs.
yii\helpers\VarDumper	VarDumper is intended to replace the buggy PHP function var_dump and print_r.
yii\i18n\DbMessageSource	DbMessageSource extends yii\i18n\MessageSource and represents a message source that stores translated messages in database.
yii\i18n\Formatter	Formatter provides a set of commonly used data formatting methods.
yii\i18n\GettextFile	GettextFile is the base class for representing a Gettext message file.
yii\i18n\GettextMessageSource	GettextMessageSource represents a message source that is based on GNU Gettext.
yii\i18n\GettextMoFile	GettextMoFile represents an MO Gettext message file.
yii\i18n\GettextPoFile	GettextPoFile represents a PO Gettext message file.
yii\i18n\I18N	I18N provides features related with internationalization (I18N) and localization (L10N).
yii\i18n\MessageFormatter	MessageFormatter allows formatting messages via ICU message format
yii\i18n\MessageSource	MessageSource is the base class for message translation repository classes.
yii\i18n\MissingTranslationEvent	MissingTranslationEvent represents the parameter for the yii\i18n\MessageSource::EVENT_MISSING_TRANSLATION event.
yii\i18n\PhpMessageSource	PhpMessageSource represents a message source that stores translated messages in PHP scripts.
yii\log\DbTarget	DbTarget stores log messages in a database table.
yii\log\Dispatcher	Dispatcher manages a set of log targets.
yii\log\EmailTarget	EmailTarget sends selected log messages to the specified email addresses.
yii\log\FileTarget	FileTarget records log messages in a file.
yii\log\Logger	Logger records logged messages in memory and sends them to different targets if $dispatcher is set.
yii\log\SyslogTarget	SyslogTarget writes log to syslog.
yii\log\Target	Target is the base class for all log target classes.
yii\mail\BaseMailer	BaseMailer serves as a base class that implements the basic functions required by yii\mail\MailerInterface.
yii\mail\BaseMessage	BaseMessage serves as a base class that implements the send() method required by yii\mail\MessageInterface.
yii\mail\MailEvent	MailEvent represents the event parameter used for events triggered by yii\mail\BaseMailer.
yii\mail\MailerInterface	MailerInterface is the interface that should be implemented by mailer classes.
yii\mail\MessageInterface	MessageInterface is the interface that should be implemented by mail message classes.
yii\mutex\DbMutex	DbMutex is the base class for classes, which relies on database while implementing mutex "lock" mechanism.
yii\mutex\FileMutex	FileMutex implements mutex "lock" mechanism via local file system files.
yii\mutex\Mutex	The Mutex component allows mutual execution of concurrent processes in order to prevent "race conditions".
yii\mutex\MysqlMutex	MysqlMutex implements mutex "lock" mechanism via MySQL locks.
yii\mutex\OracleMutex	OracleMutex implements mutex "lock" mechanism via Oracle locks.
yii\mutex\PgsqlMutex	PgsqlMutex implements mutex "lock" mechanism via PgSQL locks.
yii\rbac\Assignment	Assignment represents an assignment of a role to a user.
yii\rbac\BaseManager	BaseManager is a base class implementing yii\rbac\ManagerInterface for RBAC management.
yii\rbac\CheckAccessInterface	For more details and usage information on CheckAccessInterface, see the guide article on security authorization.
yii\rbac\DbManager	DbManager represents an authorization manager that stores authorization information in database.
yii\rbac\Item	For more details and usage information on Item, see the guide article on security authorization.
yii\rbac\ManagerInterface	For more details and usage information on ManagerInterface, see the guide article on security authorization.
yii\rbac\Permission	For more details and usage information on Permission, see the guide article on security authorization.
yii\rbac\PhpManager	PhpManager represents an authorization manager that stores authorization information in terms of a PHP script file.
yii\rbac\Role	For more details and usage information on Role, see the guide article on security authorization.
yii\rbac\Rule	Rule represents a business constraint that may be associated with a role, permission or assignment.
yii\rest\Action	Action is the base class for action classes that implement RESTful API.
yii\rest\ActiveController	ActiveController implements a common set of actions for supporting RESTful access to ActiveRecord.
yii\rest\Controller	Controller is the base class for RESTful API controller classes.
yii\rest\CreateAction	CreateAction implements the API endpoint for creating a new model from the given data.
yii\rest\DeleteAction	DeleteAction implements the API endpoint for deleting a model.
yii\rest\IndexAction	IndexAction implements the API endpoint for listing multiple models.
yii\rest\OptionsAction	OptionsAction responds to the OPTIONS request by sending back an Allow header.
yii\rest\Serializer	Serializer converts resource objects and collections into array representation.
yii\rest\UpdateAction	UpdateAction implements the API endpoint for updating a model.
yii\rest\UrlRule	UrlRule is provided to simplify the creation of URL rules for RESTful API support.
yii\rest\ViewAction	ViewAction implements the API endpoint for returning the detailed information about a model.
yii\test\ActiveFixture	ActiveFixture represents a fixture backed up by a ActiveRecord class or a database table.
yii\test\ArrayFixture	ArrayFixture represents arbitrary fixture that can be loaded from PHP files.
yii\test\BaseActiveFixture	BaseActiveFixture is the base class for fixture classes that support accessing fixture data as ActiveRecord objects.
yii\test\DbFixture	DbFixture is the base class for DB-related fixtures.
yii\test\Fixture	Fixture represents a fixed state of a test environment.
yii\test\FixtureTrait	FixtureTrait provides functionalities for loading, unloading and accessing fixtures for a test case.
yii\test\InitDbFixture	InitDbFixture represents the initial state needed for DB-related tests.
yii\validators\BooleanValidator	BooleanValidator checks if the attribute value is a boolean value.
yii\validators\CompareValidator	CompareValidator compares the specified attribute value with another value.
yii\validators\DateValidator	DateValidator verifies if the attribute represents a date, time or datetime in a proper $format.
yii\validators\DefaultValueValidator	DefaultValueValidator sets the attribute to be the specified default value.
yii\validators\EachValidator	EachValidator validates an array by checking each of its elements against an embedded validation rule.
yii\validators\EmailValidator	EmailValidator validates that the attribute value is a valid email address.
yii\validators\ExistValidator	ExistValidator validates that the attribute value exists in a table.
yii\validators\FileValidator	FileValidator verifies if an attribute is receiving a valid uploaded file.
yii\validators\FilterValidator	FilterValidator converts the attribute value according to a filter.
yii\validators\ImageValidator	ImageValidator verifies if an attribute is receiving a valid image.
yii\validators\InlineValidator	InlineValidator represents a validator which is defined as a method in the object being validated.
yii\validators\IpValidator	The validator checks if the attribute value is a valid IPv4/IPv6 address or subnet.
yii\validators\NumberValidator	NumberValidator validates that the attribute value is a number.
yii\validators\PunycodeAsset	This asset bundle provides the javascript files needed for the yii\validators\EmailValidators client validation.
yii\validators\RangeValidator	RangeValidator validates that the attribute value is among a list of values.
yii\validators\RegularExpressionValidator	RegularExpressionValidator validates that the attribute value matches the specified $pattern.
yii\validators\RequiredValidator	RequiredValidator validates that the specified attribute does not have null or empty value.
yii\validators\SafeValidator	SafeValidator serves as a dummy validator whose main purpose is to mark the attributes to be safe for massive assignment.
yii\validators\StringValidator	StringValidator validates that the attribute value is of certain length.
yii\validators\UniqueValidator	UniqueValidator validates that the attribute value is unique in the specified database table.
yii\validators\UrlValidator	UrlValidator validates that the attribute value is a valid http or https URL.
yii\validators\ValidationAsset	This asset bundle provides the javascript files for client validation.
yii\validators\Validator	Validator is the base class for all validators.
yii\web\Application	Application is the base class for all web application classes.
yii\web\AssetBundle	AssetBundle represents a collection of asset files, such as CSS, JS, images.
yii\web\AssetConverter	AssetConverter supports conversion of several popular script formats into JS or CSS scripts.
yii\web\AssetConverterInterface	The AssetConverterInterface must be implemented by asset converter classes.
yii\web\AssetManager	AssetManager manages asset bundle configuration and loading.
yii\web\BadRequestHttpException	BadRequestHttpException represents a "Bad Request" HTTP exception with status code 400.
yii\web\CacheSession	CacheSession implements a session component using cache as storage medium.
yii\web\CompositeUrlRule	CompositeUrlRule is the base class for URL rule classes that consist of multiple simpler rules.
yii\web\ConflictHttpException	ConflictHttpException represents a "Conflict" HTTP exception with status code 409
yii\web\Controller	Controller is the base class of web controllers.
yii\web\Cookie	Cookie represents information related with a cookie, such as $name, $value, $domain, etc.
yii\web\CookieCollection	CookieCollection maintains the cookies available in the current request.
yii\web\DbSession	DbSession extends yii\web\Session by using database as session data storage.
yii\web\ErrorAction	ErrorAction displays application errors using a specified view.
yii\web\ErrorHandler	ErrorHandler handles uncaught PHP errors and exceptions.
yii\web\ForbiddenHttpException	ForbiddenHttpException represents a "Forbidden" HTTP exception with status code 403.
yii\web\GoneHttpException	GoneHttpException represents a "Gone" HTTP exception with status code 410
yii\web\GroupUrlRule	GroupUrlRule represents a collection of URL rules sharing the same prefix in their patterns and routes.
yii\web\HeaderCollection	HeaderCollection is used by yii\web\Response to maintain the currently registered HTTP headers.
yii\web\HtmlResponseFormatter	HtmlResponseFormatter formats the given data into an HTML response content.
yii\web\HttpException	HttpException represents an exception caused by an improper request of the end-user.
yii\web\IdentityInterface	IdentityInterface is the interface that should be implemented by a class providing identity information.
yii\web\JqueryAsset	This asset bundle provides the jQuery JavaScript library.
yii\web\JsExpression	JsExpression marks a string as a JavaScript expression.
yii\web\JsonParser	Parses a raw HTTP request using yii\helpers\Json::decode()
yii\web\JsonResponseFormatter	JsonResponseFormatter formats the given data into a JSON or JSONP response content.
yii\web\Link	Link represents a link object as defined in JSON Hypermedia API Language.
yii\web\Linkable	Linkable is the interface that should be implemented by classes that typically represent locatable resources.
yii\web\MethodNotAllowedHttpException	MethodNotAllowedHttpException represents a "Method Not Allowed" HTTP exception with status code 405.
yii\web\MultiFieldSession	MultiFieldSession is the base class for session storage implementations with multi-field data storage support.
yii\web\MultipartFormDataParser	MultipartFormDataParser parses content encoded as 'multipart/form-data'.
yii\web\NotAcceptableHttpException	NotAcceptableHttpException represents a "Not Acceptable" HTTP exception with status code 406
yii\web\NotFoundHttpException	NotFoundHttpException represents a "Not Found" HTTP exception with status code 404.
yii\web\RangeNotSatisfiableHttpException	RangeNotSatisfiableHttpException represents an exception caused by an improper request of the end-user.
yii\web\Request	The web Request class represents an HTTP request
yii\web\RequestParserInterface	Interface for classes that parse the raw request body into a parameters array.
yii\web\Response	The web Response class represents an HTTP response
yii\web\ResponseFormatterInterface	ResponseFormatterInterface specifies the interface needed to format a response before it is sent out.
yii\web\ServerErrorHttpException	ServerErrorHttpException represents an "Internal Server Error" HTTP exception with status code 500.
yii\web\Session	Session provides session data management and the related configurations.
yii\web\SessionIterator	SessionIterator implements an iterator for traversing session variables managed by yii\web\Session.
yii\web\TooManyRequestsHttpException	TooManyRequestsHttpException represents a "Too Many Requests" HTTP exception with status code 429
yii\web\UnauthorizedHttpException	UnauthorizedHttpException represents an "Unauthorized" HTTP exception with status code 401
yii\web\UnprocessableEntityHttpException	UnprocessableEntityHttpException represents an "Unprocessable Entity" HTTP exception with status code 422.
yii\web\UnsupportedMediaTypeHttpException	UnsupportedMediaTypeHttpException represents an "Unsupported Media Type" HTTP exception with status code 415
yii\web\UploadedFile	UploadedFile represents the information for an uploaded file.
yii\web\UrlManager	UrlManager handles HTTP request parsing and creation of URLs based on a set of rules.
yii\web\UrlNormalizer	UrlNormalizer normalizes URLs for yii\web\UrlManager and yii\web\UrlRule.
yii\web\UrlNormalizerRedirectException	UrlNormalizerRedirectException represents an information for redirection which should be performed during the URL normalization.
yii\web\UrlRule	UrlRule represents a rule used by yii\web\UrlManager for parsing and generating URLs.
yii\web\UrlRuleInterface	UrlRuleInterface is the interface that should be implemented by URL rule classes.
yii\web\User	User is the class for the user application component that manages the user authentication status.
yii\web\UserEvent	This event class is used for Events triggered by the yii\web\User class.
yii\web\View	View represents a view object in the MVC pattern.
yii\web\ViewAction	ViewAction represents an action that displays a view according to a user-specified parameter.
yii\web\XmlResponseFormatter	XmlResponseFormatter formats the given data into an XML response content.
yii\web\YiiAsset	This asset bundle provides the base JavaScript files for the Yii Framework.
yii\widgets\ActiveField	ActiveField represents a form input field within an yii\widgets\ActiveForm.
yii\widgets\ActiveForm	ActiveForm is a widget that builds an interactive HTML form for one or multiple data models.
yii\widgets\ActiveFormAsset
yii\widgets\BaseListView	BaseListView is a base class for widgets displaying data from data provider such as ListView and GridView.
yii\widgets\Block	Block records all output between begin() and end() calls and stores it in yii\base\View::$blocks.
yii\widgets\Breadcrumbs	Breadcrumbs displays a list of links indicating the position of the current page in the whole site hierarchy.
yii\widgets\ContentDecorator	ContentDecorator records all output between begin() and end() calls, passes it to the given view file as $content and then echoes rendering result.
yii\widgets\DetailView	DetailView displays the detail of a single data $model.
yii\widgets\FragmentCache	FragmentCache is used by yii\base\View to provide caching of page fragments.
yii\widgets\InputWidget	InputWidget is the base class for widgets that collect user inputs.
yii\widgets\LinkPager	LinkPager displays a list of hyperlinks that lead to different pages of target.
yii\widgets\LinkSorter	LinkSorter renders a list of sort links for the given sort definition.
yii\widgets\ListView	The ListView widget is used to display data from data provider. Each data model is rendered using the view specified.
yii\widgets\MaskedInput	MaskedInput generates a masked text input.
yii\widgets\MaskedInputAsset	The asset bundle for the yii\widgets\MaskedInput widget.
yii\widgets\Menu	Menu displays a multi-level menu using nested HTML lists.
yii\widgets\Pjax	Pjax is a widget integrating the pjax jQuery plugin.
yii\widgets\PjaxAsset	This asset bundle provides the javascript files required by yii\widgets\Pjax widget.
yii\widgets\Spaceless	Spaceless widget removes whitespace characters between HTML tags. Whitespaces within HTML tags or in a plain text are always left untouched.