Upgrading Instructions for Yii Framework 2.0

This file contains the upgrade notes for Yii 2.0. These notes highlight changes that could break your application when you upgrade Yii from one version to another. Even though we try to ensure backwards compatibility (BC) as much as possible, sometimes it is not possible or very complicated to avoid it and still create a good solution to a problem. You may also want to check out the versioning policy for further details.

Upgrading in general is as simple as updating your dependency in your composer.json and running composer update. In a big application however there may be more things to consider, which are explained in the following.

Note: This document assumes you have composer installed globally so that you can run the composer command. If you have a composer.phar file inside of your project you need to replace composer with php composer.phar in the following.

Tip: Upgrading dependencies of a complex software project always comes at the risk of breaking something, so make sure you have a backup (you should be doing this anyway ;) ).

In case you use composer asset plugin instead of the currently recommended asset-packagist.org to install Bower and NPM assets, make sure it is upgraded to the latest version as well. To ensure best stability you should also upgrade composer in this step:

composer self-update
composer global require "fxp/composer-asset-plugin:^1.4.1" --no-plugins

The simple way to upgrade Yii, for example to version 2.0.10 (replace this with the version you want) will be running composer require:

composer require "yiisoft/yii2:~2.0.10" --update-with-dependencies

This command will only upgrade Yii and its direct dependencies, if necessary. Without --update-with-dependencies the upgrade might fail when the Yii version you chose has slightly different dependencies than the version you had before. composer require will by default not update any other packages as a safety feature.

Another way to upgrade is to change the composer.json file to require the new Yii version and then run composer update by specifying all packages that are allowed to be updated.

composer update yiisoft/yii2 yiisoft/yii2-composer bower-asset/inputmask

The above command will only update the specified packages and leave the versions of all other dependencies intact. This helps to update packages step by step without causing a lot of package version changes that might break in some way. If you feel lucky you can of course update everything to the latest version by running composer update without any restrictions.

After upgrading you should check whether your application still works as expected and no tests are broken. See the following notes on which changes to consider when upgrading from one version to another.

Note: The following upgrading instructions are cumulative. That is, if you want to upgrade from version A to version C and there is version B between A and C, you need to follow the instructions for both A and B.

Upgrade from Yii 2.0.20

yii\db\Query::select() and addSelect() now normalize the format that columns are stored in when saving them to $this->select, so code that works directly with that property may need to be modified.

For the following code:

  $a = $query->select('*');
  $b = $query->select('id, name');

The value was stored as is i.e.

  // a
  ['*']
  
  // b
  ['id', 'name']

Now it is stored as

  // a
  ['*' => '*']
  
  // b
  ['id' => 'id', 'name' => 'name']

Upgrade from Yii 2.0.16

In case you have extended the yii\web\DbSession class you should check if your custom implementation is compatible with the new yii\web\DbSession::$fields attribute. Especially when overriding the yii\web\DbSession::writeSession($id, $data) function.

Upgrade from Yii 2.0.15

Updated dependency to cebe/markdown to version 1.2.x. If you need stick with 1.1.x, you can specify that in your composer.json by adding the following line in the require section:

  "cebe/markdown": "~1.1.0",

yii\mutex\Mutex::acquire() no longer returns true if lock is already acquired by the same component in the same process. Make sure that you're not trying to acquire the same lock multiple times in a way that may create infinite loops, for example:

  if (Yii::$app->mutex->acquire('test')) {
       while (!Yii::$app->mutex->acquire('test')) {
           // `Yii::$app->mutex->acquire('test')` will always return `false` here, since lock is already acquired
      }
  }

Formatter methods asInteger, asDecimal, asPercent, and asCurrency are using now inner fallback methods to handle very big number values to counter inner PHP casting and floating point number presentation issues. Make sure to provide such values as string numbers.
Active Record relations are now being reset when corresponding key fields are changed. If you have relied on the fact that relations are never reloaded you have to adjust your code.

Upgrade from Yii 2.0.14

When hash format condition (array) is used in yii\db\ActiveRecord::findOne() and findAll(), the array keys (column names) are now limited to the table column names. This is to prevent SQL injection if input was not filtered properly. You should check all usages of findOne() and findAll() to ensure that input is filtered correctly. If you need to find models using different keys than the table columns, use find()->where(...) instead.

It's not an issue in the default generated code though as ID is filtered by controller code:

The following code examples are not affected by this issue (examples shown for findOne() are valid also for findAll()):

  // yii\web\Controller ensures that $id is scalar
  public function actionView($id)
  {
      $model = Post::findOne($id);
      // ...
  }

  // casting to (int) or (string) ensures no array can be injected (an exception will be thrown so this is not a good practise)
  $model = Post::findOne((int) Yii::$app->request->get('id'));

  // explicitly specifying the colum to search, passing a scalar or array here will always result in finding a single record
  $model = Post::findOne(['id' => Yii::$app->request->get('id')]);

The following code however is vulnerable, an attacker could inject an array with an arbitrary condition and even exploit SQL injection:

  $model = Post::findOne(Yii::$app->request->get('id'));

For the above example, the SQL injection part is fixed with the patches provided in this release, but an attacker may still be able to search records by different condition than a primary key search and violate your application business logic. So passing user input directly like this can cause problems and should be avoided.

Upgrade from Yii 2.0.13

Constants IPV6_ADDRESS_LENGTH, IPV4_ADDRESS_LENGTH were moved from yii\validators\IpValidator to yii\helpers\IpHelper. If your application relies on these constants, make sure to update your code to follow the changes.
yii\base\Security::compareString() is now throwing yii\base\InvalidArgumentException in case non-strings are compared.
yii\db\ExpressionInterface has been introduced to represent a wider range of SQL expressions. In case you check for instanceof yii\db\Expression in your code, you might consider changing that to checking for the interface and use the newly introduced methods to retrieve the expression content.
Added JSON support for PostgreSQL and MySQL as well as Arrays support for PostgreSQL in ActiveRecord layer. In case you already implemented such support yourself, please switch to Yii implementation.
- For MySQL JSON and PgSQL JSON & JSONB columns Active Record will return decoded JSON (that can be either array or scalar) after data population and expects arrays or scalars to be assigned for further saving them into a database.
- For PgSQL Array columns Active Record will return yii\db\ArrayExpression object that acts as an array (it implements ArrayAccess, Traversable and Countable interfaces) and expects array or yii\db\ArrayExpression to be assigned for further saving it into the database.

In case this change makes the upgrade process to Yii 2.0.14 too hard in your project, you can switch off the described behavior Then you can take your time to change your code and then re-enable arrays or JSON support.

yii\db\PdoValue class has been introduced to replace a special syntax that was used to declare PDO parameter type when binding parameters to an SQL command, for example: ['value', \PDO::PARAM_STR]. You should use new PdoValue('value', \PDO::PARAM_STR) instead. Old syntax will be removed in Yii 2.1.
yii\db\QueryBuilder::conditionBuilders property and method-based condition builders are no longer used. Class-based conditions and builders are introduced instead to provide more flexibility, extensibility and space to customization. In case you rely on that property or override any of default condition builders, follow the special guide article to update your code.
Protected method yii\db\ActiveQueryTrait::createModels() does not apply indexes as defined in indexBy property anymore.
In case you override default ActiveQuery implementation and relied on that behavior, call yii\db\Query::populate() method instead to index query results according to the indexBy parameter.
Log targets (like yii\log\EmailTarget) are now throwing yii\log\LogRuntimeException in case log can not be properly exported.
You can start preparing your application for Yii 2.1 by doing the following:
- Replace ::className() calls with ::class (if you’re running PHP 5.5+).
- Replace usages of yii\base\InvalidParamException with yii\base\InvalidArgumentException.
- Replace calls to Yii::trace() with Yii::debug().
- Remove calls to yii\BaseYii::powered().
- If you are using XCache or Zend data cache, those are going away in 2.1 so you might want to start looking for an alternative.
In case you aren't using CSRF cookies (REST APIs etc.) you should turn them off explicitly by setting \yii\web\Request::$enableCsrfCookie to false in your config file.

Upgrade from Yii 2.0.12

The yii\web\Request class allowed to determine the value of getIsSecureConnection() form the X-Forwarded-Proto header if the connection was made via a normal HTTP request. This behavior was insecure as the header could have been set by a malicious client on a non-HTTPS connection. With 2.0.13 Yii adds support for configuring trusted proxies. If your application runs behind a reverse proxy and relies on getIsSecureConnection() to return the value form the X-Forwarded-Proto header you need to explicitly allow this in the Request configuration. See the guide for more information.

This setting also affects you when Yii is running on IIS webserver, which sets the X-Rewrite-Url header. This header is now filtered by default and must be listed in trusted hosts to be detected by Yii:

  [   // accept X-Rewrite-Url from all hosts, as it will be set by IIS
      '/.*/' => ['X-Rewrite-Url'],
  ]

For compatibiliy with PHP 7.2 which does not allow classes to be named Object anymore, we needed to rename yii\base\Object to yii\base\BaseObject.

yii\base\Object still exists for backwards compatibility and will be loaded if needed in projects that are running on PHP <7.2. The compatibility class yii\base\Object extends from yii\base\BaseObject so if you have classes that extend from yii\base\Object these would still work.

What does not work however will be code that relies on instanceof checks or is_subclass_of() calls for yii\base\Object on framework classes as these do not extend yii\base\Object anymore but only extend from yii\base\BaseObject. In general such a check is not needed as there is a yii\base\Configurable interface you should check against instead.

Here is a visualisation of the change (a < b means "b extends a"):

  Before:
  
  yii\base\Object < Framework Classes
  yii\base\Object < Application Classes
  
  After Upgrade:
  
  yii\base\BaseObject < Framework Classes
  yii\base\BaseObject < yii\base\Object < Application Classes

If you want to upgrade PHP to version 7.2 in your project you need to remove all cases that extend yii\base\Object and extend from yii\base\BaseObject instead:

  yii\base\BaseObject < Framework Classes
  yii\base\BaseObject < Application Classes

For extensions that have classes extending from yii\base\Object, to be compatible with PHP 7.2, you need to require "yiisoft/yii2": "~2.0.13" in composer.json and change affected classes to extend from yii\base\BaseObject instead. It is not possible to allow Yii versions <2.0.13 and be compatible with PHP 7.2 or higher.

A new method public static function instance($refresh = false); has been added to the yii\db\ActiveRecordInterface via a new yii\base\StaticInstanceInterface. This change may affect your application in the following ways:
- If you have an instance() method defined in an ActiveRecord or Model class, you need to check whether the behavior is compatible with the method added by Yii.
- Otherwise this method is implemented in the yii\base\Model, so the change only affects your code if you implement ActiveRecordInterface in a class that does not extend Model. You may use yii\base\StaticInstanceTrait to implement it.
Fixed built-in validator creating when model has a method with the same name.

It is documented, that for the validation rules declared in model by yii\base\Model::rules(), validator can be either a built-in validator name, a method name of the model class, an anonymous function, or a validator class name. Before this change behavior was inconsistent with the documentation: method in the model had higher priority, than a built-in validator. In case you have relied on this behavior, make sure to fix it.

Behavior was changed for methods yii\base\Module::get() and yii\base\Module::has() so in case when the requested component was not found in the current module, the parent ones will be checked for this component hierarchically. Considering that the root parent module is usually an application, this change can reduce calls to global Yii::$app->get(), and replace them with module-scope calls to get(), making code more reliable and easier to test. However, this change may affect your application if you have code that uses method yii\base\Module::has() in order to check existence of the component exactly in this specific module. In this case make sure the logic is not corrupted.
If you are using "asset" command to compress assets and your web application assetManager has linkAssets turned on, make sure that "asset" command config has linkAssets turned on as well.

Upgrade from Yii 2.0.11

yii\i18n\Formatter::normalizeDatetimeValue() returns now array with additional third boolean element indicating whether the timestamp has date information or it is just time value.
yii\grid\DataColumn filter is now automatically generated as dropdown list with localized Yes and No strings in case of format being set to boolean.
The signature of yii\db\QueryBuilder::prepareInsertSelectSubQuery() was changed. The method has got an extra optional parameter $params.
The signature of yii\cache\Cache::getOrSet() has been adjusted to also accept a callable and not only Closure. If you extend this method, make sure to adjust your code.
yii\web\UrlManager now checks if rules implement getCreateUrlStatus() method in order to decide whether to use internal cache for createUrl() calls. Ensure that all your custom rules implement this method in order to fully benefit from the acceleration provided by this cache.
yii\filters\AccessControl now can be used without user component. This has two consequences:
1. If used without user component, yii\filters\AccessControl::denyAccess() throws yii\web\ForbiddenHttpException instead of redirecting to login page.
2. If used without user component, using AccessRule matching a role throws yii\base\InvalidConfigException.
Inputmask package name was changed from jquery.inputmask to inputmask. If you've configured path to assets manually, please adjust it.

Upgrade from Yii 2.0.10

A new method public function emulateExecution($value = true); has been added to the yii\db\QueryInterace. This method is implemented in the yii\db\QueryTrait, so this only affects your code if you implement QueryInterface in a class that does not use the trait.
yii\validators\FileValidator::getClientOptions() and yii\validators\ImageValidator::getClientOptions() are now public. If you extend from these classes and override these methods, you must make them public as well.
yii\widgets\MaskedInput inputmask dependency was updated to ~3.3.3. See its changelog for details.
PJAX: Auto generated IDs of the Pjax widget have been changed to use their own prefix to avoid conflicts. Auto generated IDs are now prefixed with p instead of w. This is defined by the $autoIdPrefix property of yii\widgets\Pjax. If you have any PHP or Javascript code that depends on autogenerated IDs you should update these to match this new value. It is not a good idea to rely on auto generated values anyway, so you better fix these cases by specifying an explicit ID.

Upgrade from Yii 2.0.9

RBAC: getChildRoles() method was added to \yii\rbac\ManagerInterface. If you've implemented your own RBAC manager you need to implement new method.
Microsoft SQL NTEXT data type was marked as deprecated in MSSQL so \yii\db\mssql\Schema::TYPE_TEXT was changed from 'ntext' to `'nvarchar(max)'
Method yii\web\Request::getBodyParams() has been changed to pass full value of 'content-type' header to the second argument of yii\web\RequestParserInterface::parse(). If you create your own custom parser, which relies on $contentType argument, ensure to process it correctly as it may content additional data.
yii\rest\Serializer has been changed to return a JSON array for collection data in all cases to be consistent among pages for data that is not indexed starting by 0. If your API relies on the Serializer to return data as JSON objects indexed by PHP array keys, you should set yii\rest\Serializer::$preserveKeys to true.

Upgrade from Yii 2.0.8

Part of code from yii\web\User::loginByCookie() method was moved to new getIdentityAndDurationFromCookie() and removeIdentityCookie() methods. If you override loginByCookie() method, update it in order use new methods.
Fixture console command syntax was changed from yii fixture "*" -User to yii fixture "*, -User". Upgrade your scripts if necessary.

Upgrade from Yii 2.0.7

The signature of yii\helpers\BaseArrayHelper::index() was changed. The method has got an extra optional parameter $groups.
yii\helpers\BaseArrayHelper methods isIn() and isSubset() throw \yii\base\InvalidParamException instead of \InvalidArgumentException. If you wrap calls of these methods in try/catch block, change expected exception class.
yii\rbac\ManagerInterface::canAddChild() method was added. If you have custom backend for RBAC you need to implement it.
The signature of yii\web\User::loginRequired() was changed. The method has got an extra optional parameter $checkAcceptHeader.
The signature of yii\db\ColumnSchemaBuilder::__construct() was changed. The method has got an extra optional parameter $db. In case you are instantiating this class yourself and using the $config parameter, you will need to move it to the right by one.
String types in the MSSQL column schema map were upgraded to Unicode storage types. This will have no effect on existing columns, but any new columns you generate via the migrations engine will now store data as Unicode.
Output buffering was introduced in the pair of yii\widgets\ActiveForm::init() and ::run(). If you override any of these methods, make sure that output buffer handling is not corrupted. If you call the parent implementation, when overriding, everything should work fine. You should be doing that anyway.

Upgrade from Yii 2.0.6

Added new requirement: ICU Data version >= 49.1. Please, ensure that your environment has ICU data installed and up to date to prevent unexpected behavior or crashes. This may not be the case on older systems e.g. running Debian Wheezy.

Tip: Use Yii 2 Requirements checker for easy and fast check. Look for requirements.php in root of Basic and Advanced templates (howto-comment is in head of the script).

The signature of yii\helpers\BaseInflector::transliterate() was changed. The method is now public and has an extra optional parameter $transliterator.
In yii\web\UrlRule the pattern matching group names are being replaced with the placeholders on class initialization to support wider range of allowed characters. Because of this change:
- You are required to flush your application cache to remove outdated UrlRule serialized objects. See the Cache Flushing Guide
- If you implement parseRequest() or createUrl() and rely on parameter names, call substitutePlaceholderNames() in order to replace temporary IDs with parameter names after doing matching.
The context of yii.confirm JavaScript function was changed from yii object to the DOM element which triggered the event.
- If you overrode the yii.confirm function and accessed the yii object through this, you must access it with global variable yii instead.
Traversable objects are now formatted as arrays in XML response to support SPL objects and Generators. Previous behavior could be turned on by setting XmlResponseFormatter::$useTraversableAsArray to false.
If you've implemented yii\rbac\ManagerInterface you need to implement additional method getUserIdsByRole($roleName).
If you're using ApcCache with APCu, set useApcu to true in the component config.
The yii\behaviors\SluggableBehavior class has been refactored to make it more reusable. Added new protected methods:
- isSlugNeeded()
- makeUnique()

The visibility of the following Methods has changed from private to protected:

validateSlug()
generateUniqueSlug()
The yii\console\controllers\MessageController class has been refactored to be better configurable and now also allows setting a lot of configuration options via command line. If you extend from this class, make sure it works as expected after these changes.

Upgrade from Yii 2.0.5

The signature of the following methods in yii\console\controllers\MessageController has changed. They have an extra parameter $markUnused.
- saveMessagesToDb($messages, $db, $sourceMessageTable, $messageTable, $removeUnused, $languages, $markUnused)
- saveMessagesToPHP($messages, $dirName, $overwrite, $removeUnused, $sort, $markUnused)
- saveMessagesCategoryToPHP($messages, $fileName, $overwrite, $removeUnused, $sort, $category, $markUnused)
- saveMessagesToPO($messages, $dirName, $overwrite, $removeUnused, $sort, $catalog, $markUnused)

Upgrade from Yii 2.0.4

Upgrading from 2.0.4 to 2.0.5 does not require any changes.

Upgrade from Yii 2.0.3

Updated dependency to cebe/markdown to version 1.1.x. If you need stick with 1.0.x, you can specify that in your composer.json by adding the following line in the require section:

  "cebe/markdown": "~1.0.0",

Upgrade from Yii 2.0.2

Starting from version 2.0.3 Yii Security component relies on OpenSSL crypto lib instead of Mcrypt. The reason is that Mcrypt is abandoned and isn't maintained for years. Therefore your PHP should be compiled with OpenSSL support. Most probably there's nothing to worry because it is quite typical.

If you've extended yii\base\Security to override any of the config constants you have to update your code:

- `MCRYPT_CIPHER` — now encoded in `$cipher` (and hence `$allowedCiphers`).
- `MCRYPT_MODE` — now encoded in `$cipher` (and hence `$allowedCiphers`).
- `KEY_SIZE` — now encoded in `$cipher` (and hence `$allowedCiphers`).
- `KDF_HASH` — now `$kdfHash`.
- `MAC_HASH` — now `$macHash`.
- `AUTH_KEY_INFO` — now `$authKeyInfo`.

Upgrade from Yii 2.0.0

Upgraded Twitter Bootstrap to version 3.3.x. If you need to use an older version (i.e. stick with 3.2.x) you can specify that in your composer.json by adding the following line in the require section:

  "bower-asset/bootstrap": "3.2.*",

Upgrade from Yii 2.0 RC

If you've implemented yii\rbac\ManagerInterface you need to add implementation for new method removeChildren().
The input dates for datetime formatting are now assumed to be in UTC unless a timezone is explicitly given. Before, the timezone assumed for input dates was the default timezone set by PHP which is the same as Yii::$app->timeZone. This causes trouble because the formatter uses Yii::$app->timeZone as the default values for output so no timezone conversion was possible. If your timestamps are stored in the database without a timezone identifier you have to ensure they are in UTC or add a timezone identifier explicitly.
yii\bootstrap\Collapse is now encoding labels by default. encode item option and global encodeLabels property were introduced to disable it. Keys are no longer used as labels. You need to remove keys and use label item option instead.
The yii\base\View::beforeRender() and yii\base\View::afterRender() methods have two extra parameters $viewFile and $params. If you are overriding these methods, you should adjust the method signature accordingly.
If you've used asImage formatter i.e. Yii::$app->formatter->asImage($value, $alt); you should change it to Yii::$app->formatter->asImage($value, ['alt' => $alt]);.
Yii now requires cebe/markdown 1.0.0 or higher, which includes breaking changes in its internal API. If you extend the markdown class you need to update your implementation. See https://github.com/cebe/markdown/releases/tag/1.0.0-rc for details. If you just used the markdown helper class there is no need to change anything.
If you are using CUBRID DBMS, make sure to use at least version 9.3.0 as the server and also as the PDO extension. Quoting of values is broken in prior versions and Yii has no reliable way to work around this issue. A workaround that may have worked before has been removed in this release because it was not reliable.

Upgrade from Yii 2.0 Beta

If you are using Composer to upgrade Yii, you should run the following command first (once for all) to install the composer-asset-plugin, before you update your project:

  php composer.phar global require "fxp/composer-asset-plugin:~1.3.1"

You also need to add the following code to your project's composer.json file:

  "extra": {
      "asset-installer-paths": {
          "npm-asset-library": "vendor/npm",
          "bower-asset-library": "vendor/bower"
      }
  }

It is also a good idea to upgrade composer itself to the latest version if you see any problems:

  composer self-update

If you used clearAll() or clearAllAssignments() of yii\rbac\DbManager, you should replace them with removeAll() and removeAllAssignments() respectively.
If you created RBAC rule classes, you should modify their execute() method by adding $user as the first parameter: execute($user, $item, $params). The $user parameter represents the ID of the user currently being access checked. Previously, this is passed via $params['user'].
If you override yii\grid\DataColumn::getDataCellValue() with visibility protected you have to change visibility to public as visibility of the base method has changed.
If you have classes implementing yii\web\IdentityInterface (very common), you should modify the signature of findIdentityByAccessToken() as public static function findIdentityByAccessToken($token, $type = null). The new $type parameter will contain the type information about the access token. For example, if you use yii\filters\auth\HttpBearerAuth authentication method, the value of this parameter will be yii\filters\auth\HttpBearerAuth. This allows you to differentiate access tokens taken by different authentication methods.
If you are sharing the same cache across different applications, you should configure the keyPrefix property of the cache component to use some unique string. Previously, this property was automatically assigned with a unique string.
If you are using dropDownList(), listBox(), activeDropDownList(), or activeListBox() of yii\helpers\Html, and your list options use multiple blank spaces to format and align option label texts, you need to specify the option encodeSpaces to be true.
If you are using yii\grid\GridView and have configured a data column to use a PHP callable to return cell values (via yii\grid\DataColumn::value), you may need to adjust the signature of the callable to be function ($model, $key, $index, $widget). The $key parameter was newly added in this release.
yii\console\controllers\AssetController is now using hashes instead of timestamps. Replace all {ts} with {hash}.
The database table of the yii\log\DbTarget now needs a prefix column to store context information. You can add it with ALTER TABLE log ADD COLUMN prefix TEXT AFTER log_time;.
The fileinfo PHP extension is now required by Yii. If you use yii\helpers\FileHelper::getMimeType(), make sure you have enabled this extension. This extension is builtin in php above 5.3.
Please update your main layout file by adding this line in the <head> section: <?= Html::csrfMetaTags() ?>. This change is needed because yii\web\View no longer automatically generates CSRF meta tags due to issue #3358.
If your model code is using the file validation rule, you should rename its types option to extensions.
MailEvent class has been moved to the yii\mail namespace. You have to adjust all references that may exist in your code.
The behavior and signature of ActiveRecord::afterSave() has changed. ActiveRecord::$isNewRecord will now always be false in afterSave and also dirty attributes are not available. This change has been made to have a more consistent and expected behavior. The changed attributes are now available in the new parameter of afterSave() $changedAttributes. $changedAttributes contains the old values of attributes that had changed and were saved.
ActiveRecord::updateAttributes() has been changed to not trigger events and not respect optimistic locking anymore to differentiate it more from calling update(false) and to ensure it can be used in afterSave() without triggering infinite loops.
If you are developing RESTful APIs and using an authentication method such as yii\filters\auth\HttpBasicAuth, you should explicitly configure yii\web\User::enableSession in the application configuration to be false to avoid starting a session when authentication is performed. Previously this was done automatically by authentication method.
mail component was renamed to mailer, yii\log\EmailTarget::$mail was renamed to yii\log\EmailTarget::$mailer. Please update all references in the code and config files.
yii\caching\GroupDependency was renamed to TagDependency. You should create such a dependency using the code new \yii\caching\TagDependency(['tags' => 'TagName']), where TagName is similar to the group name that you previously used.
If you are using the constant YII_PATH in your code, you should rename it to YII2_PATH now.
You must explicitly configure yii\web\Request::cookieValidationKey with a secret key. Previously this is done automatically. To do so, modify your application configuration like the following:

  return [
      // ...
      'components' => [
          'request' => [
              'cookieValidationKey' => 'your secret key here',
          ],
      ],
  ];

Note: If you are using the Advanced Project Template you should not add this configuration to common/config or console/config because the console application doesn't have to deal with CSRF and uses its own request that doesn't have cookieValidationKey property.

yii\rbac\PhpManager now stores data in three separate files instead of one. In order to convert old file to new ones save the following code as convert.php that should be placed in the same directory your rbac.php is in:

  <?php
  $oldFile = 'rbac.php';
  $itemsFile = 'items.php';
  $assignmentsFile = 'assignments.php';
  $rulesFile = 'rules.php';

  $oldData = include $oldFile;

  function saveToFile($data, $fileName) {
      $out = var_export($data, true);
      $out = "<?php\nreturn " . $out . ';';
      $out = str_replace(['array (', ')'], ['[', ']'], $out);
      file_put_contents($fileName, $out, LOCK_EX);
  }

  $items = [];
  $assignments = [];
  if (isset($oldData['items'])) {
      foreach ($oldData['items'] as $name => $data) {
          if (isset($data['assignments'])) {
              foreach ($data['assignments'] as $userId => $assignmentData) {
                  $assignments[$userId][] = $assignmentData['roleName'];
              }
              unset($data['assignments']);
          }
          $items[$name] = $data;
      }
  }

  $rules = [];
  if (isset($oldData['rules'])) {
      $rules = $oldData['rules'];
  }

  saveToFile($items, $itemsFile);
  saveToFile($assignments, $assignmentsFile);
  saveToFile($rules, $rulesFile);

  echo "Done!\n";

Run it once, delete rbac.php. If you've configured authFile property, remove the line from config and instead configure itemFile, assignmentFile and ruleFile.

Static helper yii\helpers\Security has been converted into an application component. You should change all usage of its methods to a new syntax, for example: instead of yii\helpers\Security::hashData() use Yii::$app->getSecurity()->hashData(). The generateRandomKey() method now produces not an ASCII compatible output. Use generateRandomString() instead. Default encryption and hash parameters has been upgraded. If you need to decrypt/validate data that was encrypted/hashed before, use the following configuration of the 'security' component:

  return [
      'components' => [
          'security' => [
              'derivationIterations' => 1000,
          ],
          // ...
      ],
      // ...
  ];

If you are using query caching, you should modify your relevant code as follows, as beginCache() and endCache() are replaced by cache():

  $db->cache(function ($db) {

     // ... SQL queries that need to use query caching

  }, $duration, $dependency);

Due to significant changes to security you need to upgrade your code to use \yii\base\Security component instead of helper. If you have any data encrypted it should be re-encrypted. In order to do so you can use old security helper as explained by @docsolver at github.
[[yii\helpers\Url::to()]] will no longer prefix base URL to relative URLs. For example, Url::to('images/logo.png') will return images/logo.png directly. If you want a relative URL to be prefix with base URL, you should make use of the alias @web. For example, Url::to('@web/images/logo.png') will return /BaseUrl/images/logo.png.
The following properties are now taking false instead of null for "don't use" case:
- yii\bootstrap\NavBar::$brandLabel.
- yii\bootstrap\NavBar::$brandUrl.
- yii\bootstrap\Modal::$closeButton.
- yii\bootstrap\Modal::$toggleButton.
- yii\bootstrap\Alert::$closeButton.
- yii\widgets\LinkPager::$nextPageLabel.
- yii\widgets\LinkPager::$prevPageLabel.
- yii\widgets\LinkPager::$firstPageLabel.
- yii\widgets\LinkPager::$lastPageLabel.
The format of the Faker fixture template is changed. For an example, please refer to the file apps/advanced/common/tests/templates/fixtures/user.php.
The signature of all file downloading methods in yii\web\Response is changed, as summarized below:
- sendFile($filePath, $attachmentName = null, $options = [])
- sendContentAsFile($content, $attachmentName, $options = [])
- sendStreamAsFile($handle, $attachmentName, $options = [])
- xSendFile($filePath, $attachmentName = null, $options = [])
The signature of callbacks used in yii\base\ArrayableTrait::fields() is changed from function ($field, $model) { to function ($model, $field) {.
Html::radio(), Html::checkbox(), Html::radioList(), Html::checkboxList() no longer generate the container tag around each radio/checkbox when you specify labels for them. You should manually render such container tags, or set the item option for Html::radioList(), Html::checkboxList() to generate the container tags.
The formatter class has been refactored to have only one class regardless whether PHP intl extension is installed or not. Functionality of yii\base\Formatter has been merged into yii\i18n\Formatter and yii\base\Formatter has been removed so you have to replace all usage of yii\base\Formatter with yii\i18n\Formatter in your code. Also the API of the Formatter class has changed in many ways. The signature of the following Methods has changed:
- asDate
- asTime
- asDatetime
- asSize has been split up into asSize and asShortSize
- asCurrency
- asDecimal
- asPercent
- asScientific

The following methods have been removed, this also means that the corresponding format which may be used by a GridView or DetailView is not available anymore:

asNumber
asDouble

Also due to these changes some formatting defaults have changes so you have to check all your GridView and DetailView configuration and make sure the formatting is displayed correctly.

The configuration for asSize() has changed. It now uses the configuration for the number formatting from intl and only the base is configured using $sizeFormatBase.

The specification of the date and time formats is now using the ICU pattern format even if PHP intl extension is not installed. You can prefix a date format with php: to use the old format of the PHP date()-function.

The DateValidator has been refactored to use the same format as the Formatter class now (see previous change). When you use the DateValidator and did not specify a format it will now be what is configured in the formatter class instead of 'Y-m-d'. To get the old behavior of the DateValidator you have to set the format explicitly in your validation rule:

  ['attributeName', 'date', 'format' => 'php:Y-m-d'],

beforeValidate(), beforeValidateAll(), afterValidate(), afterValidateAll(), ajaxBeforeSend() and ajaxComplete() are removed from ActiveForm. The same functionality is now achieved via JavaScript event mechanism like the following:

  $('#myform').on('beforeValidate', function (event, messages, deferreds) {
      // called when the validation is triggered by submitting the form
      // return false if you want to cancel the validation for the whole form
  }).on('beforeValidateAttribute', function (event, attribute, messages, deferreds) {
      // before validating an attribute
      // return false if you want to cancel the validation for the attribute
  }).on('afterValidateAttribute', function (event, attribute, messages) {
      // ...
  }).on('afterValidate', function (event, messages) {
      // ...
  }).on('beforeSubmit', function () {
      // after all validations have passed
      // you can do ajax form submission here
      // return false if you want to stop form submission
  });

The signature of View::registerJsFile() and View::registerCssFile() has changed. The $depends and $position paramaters have been merged into $options. The new signatures are as follows:
- registerJsFile($url, $options = [], $key = null)
- registerCssFile($url, $options = [], $key = null)

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