diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index 9399c093f37..17e514f9588 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -1,4 +1,4 @@
-name: Code Quality
+name: lint
 
 on: [push, pull_request]
 
diff --git a/framework/behaviors/AttributeTypecastBehavior.php b/framework/behaviors/AttributeTypecastBehavior.php
index 6bb8ccc3a28..e2bde1b9a98 100644
--- a/framework/behaviors/AttributeTypecastBehavior.php
+++ b/framework/behaviors/AttributeTypecastBehavior.php
@@ -185,7 +185,7 @@ class AttributeTypecastBehavior extends Behavior
      * @var array internal static cache for auto detected [[attributeTypes]] values
      * in format: ownerClassName => attributeTypes
      */
-    private static $autoDetectedAttributeTypes = [];
+    private static $_autoDetectedAttributeTypes = [];
 
 
     /**
@@ -194,7 +194,7 @@ class AttributeTypecastBehavior extends Behavior
      */
     public static function clearAutoDetectedAttributeTypes()
     {
-        self::$autoDetectedAttributeTypes = [];
+        self::$_autoDetectedAttributeTypes = [];
     }
 
     /**
@@ -206,10 +206,10 @@ public function attach($owner)
 
         if ($this->attributeTypes === null) {
             $ownerClass = get_class($this->owner);
-            if (!isset(self::$autoDetectedAttributeTypes[$ownerClass])) {
-                self::$autoDetectedAttributeTypes[$ownerClass] = $this->detectAttributeTypes();
+            if (!isset(self::$_autoDetectedAttributeTypes[$ownerClass])) {
+                self::$_autoDetectedAttributeTypes[$ownerClass] = $this->detectAttributeTypes();
             }
-            $this->attributeTypes = self::$autoDetectedAttributeTypes[$ownerClass];
+            $this->attributeTypes = self::$_autoDetectedAttributeTypes[$ownerClass];
         }
     }
 
diff --git a/framework/db/BatchQueryResult.php b/framework/db/BatchQueryResult.php
index 9792891b027..c80ed82b5cf 100644
--- a/framework/db/BatchQueryResult.php
+++ b/framework/db/BatchQueryResult.php
@@ -42,6 +42,11 @@ class BatchQueryResult extends Component implements \Iterator
      * @since 2.0.41
      */
     const EVENT_FINISH = 'finish';
+    /**
+     * MSSQL error code for exception that is thrown when last batch is size less than specified batch size
+     * @see https://github.com/yiisoft/yii2/issues/10023
+     */
+    const MSSQL_NO_MORE_ROWS_ERROR_CODE = -13;
 
     /**
      * @var Connection|null the DB connection to be used when performing batch query.
@@ -79,11 +84,6 @@ class BatchQueryResult extends Component implements \Iterator
      * @var string|int the key for the current iteration
      */
     private $_key;
-    /**
-     * @var int MSSQL error code for exception that is thrown when last batch is size less than specified batch size
-     * @see https://github.com/yiisoft/yii2/issues/10023
-     */
-    private $mssqlNoMoreRowsErrorCode = -13;
 
 
     /**
@@ -187,7 +187,7 @@ protected function getRows()
             }
         } catch (\PDOException $e) {
             $errorCode = isset($e->errorInfo[1]) ? $e->errorInfo[1] : null;
-            if ($this->getDbDriverName() !== 'sqlsrv' || $errorCode !== $this->mssqlNoMoreRowsErrorCode) {
+            if ($this->getDbDriverName() !== 'sqlsrv' || $errorCode !== self::MSSQL_NO_MORE_ROWS_ERROR_CODE) {
                 throw $e;
             }
         }
diff --git a/framework/log/migrations/m141106_185632_log_init.php b/framework/log/migrations/m141106_185632_log_init.php
index 5e3db767ab8..ee73b6ff2d4 100644
--- a/framework/log/migrations/m141106_185632_log_init.php
+++ b/framework/log/migrations/m141106_185632_log_init.php
@@ -25,7 +25,7 @@ class m141106_185632_log_init extends Migration
     /**
      * @var DbTarget[] Targets to create log table for
      */
-    private $dbTargets = [];
+    private $_dbTargets = [];
 
     /**
      * @throws InvalidConfigException
@@ -33,7 +33,7 @@ class m141106_185632_log_init extends Migration
      */
     protected function getDbTargets()
     {
-        if ($this->dbTargets === []) {
+        if ($this->_dbTargets === []) {
             $log = Yii::$app->getLog();
 
             $usedTargets = [];
@@ -46,17 +46,17 @@ protected function getDbTargets()
                     if (!in_array($currentTarget, $usedTargets, true)) {
                         // do not create same table twice
                         $usedTargets[] = $currentTarget;
-                        $this->dbTargets[] = $target;
+                        $this->_dbTargets[] = $target;
                     }
                 }
             }
 
-            if ($this->dbTargets === []) {
+            if ($this->_dbTargets === []) {
                 throw new InvalidConfigException('You should configure "log" component to use one or more database targets before executing this migration.');
             }
         }
 
-        return $this->dbTargets;
+        return $this->_dbTargets;
     }
 
     public function up()
diff --git a/framework/web/Session.php b/framework/web/Session.php
index 1702c21fb9b..2fbd1229e75 100644
--- a/framework/web/Session.php
+++ b/framework/web/Session.php
@@ -105,8 +105,7 @@ class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Co
     /**
      * @var array|null is used for saving session between recreations due to session parameters update.
      */
-    private $frozenSessionData;
-
+    private $_frozenSessionData;
 
     /**
      * Initializes the application component.
@@ -1016,7 +1015,7 @@ protected function freeze()
     {
         if ($this->getIsActive()) {
             if (isset($_SESSION)) {
-                $this->frozenSessionData = $_SESSION;
+                $this->_frozenSessionData = $_SESSION;
             }
             $this->close();
             Yii::info('Session frozen', __METHOD__);
@@ -1029,7 +1028,7 @@ protected function freeze()
      */
     protected function unfreeze()
     {
-        if (null !== $this->frozenSessionData) {
+        if (null !== $this->_frozenSessionData) {
             YII_DEBUG ? session_start() : @session_start();
 
             if ($this->getIsActive()) {
@@ -1040,8 +1039,8 @@ protected function unfreeze()
                 Yii::error($message, __METHOD__);
             }
 
-            $_SESSION = $this->frozenSessionData;
-            $this->frozenSessionData = null;
+            $_SESSION = $this->_frozenSessionData;
+            $this->_frozenSessionData = null;
         }
     }