Yii PHP框架版本2-php教程-PHP中文网

本文译者：Alexander Gao 引用、转载请说明出处。

Yii PHP框架 版本2 ¶

安装

此为 Yii 2的核心框架代码.

此仓库是 https://github.com/yiisoft/yii2下的子项目，请对主仓库提交问题报告、拉取请求。关于许可信息请查阅 LICENSE 文档。

安装 ¶

推荐通过 composer 来安装Yii框架.

运行

composer global <strong>require</strong> "fxp/composer-asset-plugin:~1.0.0"<span>composer <strong>require</strong> yiisoft</span>/yii2

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或添加

"yiisoft/yii2": "~2.0.0",

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到composer.json 的require section中。

类参考

类	描述
Yii	Yii 是服务公共框架功能的助手类。
yii\BaseYii	BaseYii 是Yii框架的核心助手类。
yii\base\Action	Action 是所有控制器动作类的基类。
yii\base\ActionEvent	ActionEvent 用于表示一个动作事件的事件参数。
yii\base\ActionFilter	ActionFilter 是动作过滤器的基类。
yii\base\Application	Application 是所有应用类的基类。
yii\base\ArrayAccessTrait	ArrayAccessTrait 为 IteratorAggregate, ArrayAccess 和Countable 提供实现。
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 提供了一个 yii\base\Arrayable 接口的公共实现。
yii\base\Behavior	Behavior 是所有行为类的基类。
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 是包含控制器逻辑的类的基类。
yii\base\DynamicModel	DynamicModel 是一个主要用于特定数据验证的模型类。
yii\base\ErrorException	ErrorException 表示一个PHP错误。
yii\base\ErrorHandler	ErrorHandler 处理未捕获的php错误和异常。
yii\base\Event	Event 是所有事件类的基类。
yii\base\Exception	Exception为所有问题表示一个普通异常。
yii\base\ExitException	ExitException 表示一个应用程序的正常终止。
yii\base\InlineAction	InlineAction 表示一个被定义为控制器方法的动作。
yii\base\InvalidCallException	InvalidCallException 表示一个因使用错误方式调用方法而引发的异常。
yii\base\InvalidConfigException	InvalidConfigException 表示由错误的对象配置而引发的异常。
yii\base\InvalidParamException	InvalidParamException 表示由传入到方法的无效函数而引发的异常。
yii\base\InvalidRouteException	InvalidRouteException 表示因无效路由引发的异常。.
yii\base\InvalidValueException	InvalidValueException 表示因函数返回意外类型的值而引发的异常。
yii\base\Model	Model 是数据模型的基类。
yii\base\ModelEvent	ModelEvent 表示了一个 yii\base\Model events 需要的参数。
yii\base\Module	Module 是模块和应用程序类的基类。
yii\base\NotSupportedException	NotSupportedException 表示一个因访问不支持的功能而引发的异常。
yii\base\Object	Object is the base class that implements the property feature.
yii\base\Request	Request 表示一个被 yii\base\Application 处理的请求对象。
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 表示应用程序的主题。
yii\base\UnknownClassException	UnknownClassException 表示因使用未知的类引发的异常。
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 是将要显示给终端用户的异常的基类。
yii\base\View	View 代表MVC模式下的视图对象。
yii\base\ViewContextInterface	ViewContextInterface is the interface that should implemented by classes who want to support relative view names.
yii\base\ViewEvent	ViewEvent 表示被 yii\base\View 组件触发的事件。
yii\base\ViewRenderer	ViewRenderer是视图渲染类的基类。
yii\base\Widget	Widget 是插件类的基类。
yii\behaviors\AttributeBehavior	AttributeBehavior automatically assigns a specified value to one or multiple attributes of an ActiveRecord object when certain events happen.
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\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\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 显示一个验证码图片和接收用户输入的验证码的输入框。
yii\captcha\CaptchaAction	CaptchaAction 显示一个验证码图片。
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\controllers\AssetController	Allows you to combine and compress your JavaScript and CSS files.
yii\console\controllers\BaseMigrateController	BaseMigrateController is base class for migrate controllers.
yii\console\controllers\CacheController	允许你来刷新缓存。
yii\console\controllers\FixtureController	Manages fixture data loading and unloading.
yii\console\controllers\HelpController	提供关于控制台命令的错误信息。
yii\console\controllers\MessageController	Extracts messages to be translated from source files.
yii\console\controllers\MigrateController	Manages Application migrations.
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 表示一个数据库事务。
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\QueryBuilder	QueryBuilder 是MySQL数据库的查询构建器。
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\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\ServiceLocator	ServiceLocator 实现了一个服务定位器。
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\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\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\StringHelper	StringHelper
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	Mutex component allows mutual execution of the concurrent processes, preventing "race conditions".
yii\mutex\MysqlMutex	MysqlMutex implements mutex "lock" mechanism via MySQL 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\DbManager	DbManager represents an authorization manager that stores authorization information in database.
yii\rbac\Item
yii\rbac\ManagerInterface
yii\rbac\Permission
yii\rbac\PhpManager	PhpManager represents an authorization manager that stores authorization information in terms of a PHP script file.
yii\rbac\Role
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
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\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 验证指定属性不是空或null。
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 验证属性值符合一定长度。
yii\validators\UniqueValidator	UniqueValidator 验证属性值在指定数据库表中是唯一的。
yii\validators\UrlValidator	UrlValidator 验证属性值是否为有效的http或https URL。
yii\validators\ValidationAsset	此资源包提供了客户端验证所需的js文件。
yii\validators\Validator	Validator 是所有验证器类的基类。
yii\web\Application	Application是所有web应用程序类的基类。
yii\web\AssetBundle	AssetBundle 表示一组资源文件的集合，如 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 表示一个cookie关联的信息，如 $name, $value, $domain, 等等.
yii\web\CookieCollection	CookieCollection 保持当前请求中的cookies可用。
yii\web\DbSession	DbSession extends yii\web\Session by using database as Session data storage.
yii\web\ErrorAction	ErrorAction 使用指定视图显示应用程序错误。
yii\web\ErrorHandler	ErrorHandler 处理未捕获的错误和异常。
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\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\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\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 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.