Fixes #1812: Hide potential warning message due to race condition occurring to…

framework/CHANGELOG.md

@@ -26,6 +26,7 @@ Yii Framework 2 Change Log
 - Bug #1710: OpenId auth client does not request required attributes correctly (klimov-paul)
 - Bug #1798: Fixed label attributes for array fields (zhuravljov)
 - Bug #1800: Better check for `$_SERVER['HTTPS']` in `yii\web\Request::getIsSecureConnection()` (ginus, samdark)
+- Bug #1812: Hide potential warning message due to race condition occurring to `Session::regenerateID()` call (qiangxue)
 - Bug #1827: Debugger toolbar is loaded twice if an action is calling `run()` to execute another action (qiangxue)
 - Bug #1868: Added ability to exclude tables from FixtureController apply/clear actions. (Ragazzo)
 - Bug #1869: Fixed tables clearing. `TRUNCATE` changed to `DELETE` to avoid postgresql tables checks (and truncating all tables) (Ragazzo)

framework/web/Session.php

@@ -211,7 +211,9 @@ class Session extends Component implements \IteratorAggregate, \ArrayAccess, \Co
 	 */
 	public function regenerateID($deleteOldSession = false)
 	{
-		session_regenerate_id($deleteOldSession);
+		// add @ to inhibit possible warning due to race condition
+		// https://github.com/yiisoft/yii2/pull/1812
+		@session_regenerate_id($deleteOldSession);
 	}
 
 	/**