Fixes #15318: Fixed "session_name(): Cannot change session name when session is active" errors

framework/CHANGELOG.md

@@ -8,6 +8,7 @@ Yii Framework 2 Change Log
 - Bug #15692: Fix ExistValidator with targetRelation ignores filter (developeruz)
 - Bug #15693: Fixed `yii\filters\auth\HttpHeaderAuth` to work correctly when pattern is set but was not matched (bboure)
 - Bug #15696: Fix magic getter for ActiveRecord (developeruz)
+- Bug #15318: Fixed "session_name(): Cannot change session name when session is active" errors (bscheshirwork, samdark)
 - Bug #15726: Fix ExistValidator is broken for NOSQL (developeruz)
 - Enh #15716: Implemented `\Traversable` in `yii\db\ArrayExpression` (silverfire)
 - Bug #15678: Fixed `resetForm()` method in `yii.activeForm.js` which used an undefined variable (Izumi-kun)

framework/web/Session.php

@@ -322,7 +322,9 @@ class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Co
      */
     public function setName($value)
     {
+        $this->freeze();
         session_name($value);
+        $this->unfreeze();
     }
 
     /**

tests/framework/web/session/SessionTest.php

@@ -70,4 +70,22 @@ class SessionTest extends TestCase
         $this->assertNotEquals($oldGcProbability, $newGcProbability);
         $this->assertEquals(100, $newGcProbability);
     }
+
+    /**
+     * Test set name. Also check set name twice and after open
+     */
+    public function testSetName()
+    {
+        $session = new Session();
+        $session->setName('oldName');
+
+        $this->assertEquals('oldName', $session->getName());
+
+        $session->open();
+        $session->setName('newName');
+
+        $this->assertEquals('newName', $session->getName());
+
+        $session->destroy();
+    }
 }