yii2 - PHP: Trying to get property of non-object, from BatchError object of Bing Ads API -

i error when try view error messages api. documentation says returns array of batcherror objects in partialerror field. when try access index property of batcherror, gives me error. wrong?

https://msdn.microsoft.com/en-us/library/bing-ads-campaign-management-addadgroups.aspx#anchor_1

php notice – yii\base\errorexception  trying property of non-object  1. in /cygdrive/c/users/chloe/workspace/bestsales/models/bingads.php @ line 384        $response = $campaignproxy->getservice()->addadgroups($request);     } catch (\soapfault $e) {       $this->handleexception($e);       return null;     }     $adgroupsids = $response->adgroupids;     $partialerrors = $response->partialerrors;     foreach ($partialerrors $batcherror) {       yii::error($batcherror);       $adgroup = $adgroups[$batcherror->index]; # <<<< 

logs:

2016-09-11 22:15:59 [::1][1][v5adqit0fiae7bon3i1lks49m3][error][application] [     unserialize('o:8:"stdclass":8:{s:4:"code";i:1016;s:7:"details";n;s:9:"errorcode";s:33:"campaignserviceinvalidentitystate";s:9:"fieldpath";n;s:23:"forwardcompatibilitymap";n;s:5:"index";i:0;s:7:"message";s:104:"passed entity state invalid. please refer documentation list of valid values given entity.";s:4:"type";s:10:"batcherror";}'), ]     in /cygdrive/c/users/chloe/workspace/bestsales/models/bingads.php:383     in /cygdrive/c/users/chloe/workspace/bestsales/models/adgroup.php:195     in /cygdrive/c/users/chloe/workspace/bestsales/models/keyword.php:145 2016-09-11 22:15:59 [::1][1][v5adqit0fiae7bon3i1lks49m3][error][yii\base\errorexception:8] exception 'yii\base\errorexception' message 'trying property of non-object' in /cygdrive/c/users/chloe/workspace/bestsales/models/bingads.php:384 

i tried

  yii::error($batcherror);   yii::error($batcherror['index']);   yii::error($batcherror::$index);   yii::error($batcherror->$index);   yii::error($batcherror->index); 

i used vardumper , got this:

[     0 => stdclass#1     (         [code] => 1016         [details] => null         [errorcode] => 'campaignserviceinvalidentitystate'         [fieldpath] => null         [forwardcompatibilitymap] => null         [index] => 0         [message] => 'passed entity state invalid. please refer documentation list of valid values given entity.'         [type] => 'batcherror'     ) ] 

i able fix with

$partialerrors = $response->partialerrors; if (!empty($partialerrors->batcherror)) $partialerrors = $partialerrors->batcherror; foreach ($partialerrors $batcherror) { 

apparently foreach able loop on properties of object too, did know know do, , apparently partialerrors object 1 property named batcherror then contains array (but batcherror may not exist @ all). doesn't match documentation, or @ least not documentation of least surprise.