Fixed #7954: Out of memory error on token export

application/helpers/export_helper.php

@@ -1705,14 +1705,13 @@ function tokensExport($iSurveyID)
     $bquery .= " ORDER BY tid";
     Yii::app()->loadHelper('database');
 
-    $bresult = Yii::app()->db->createCommand($bquery)->query()->readAll(); //dbExecuteAssoc($bquery) is faster but deprecated!
+    $bresult = Yii::app()->db->createCommand($bquery)->query(); //dbExecuteAssoc($bquery) is faster but deprecated!
     //HEADERS should be after the above query else timeout errors in case there are lots of tokens!
     header("Content-Disposition: attachment; filename=tokens_".$iSurveyID.".csv");
     header("Content-type: text/comma-separated-values; charset=UTF-8");
     header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
     header("Pragma: cache");
 
-    $bfieldcount=count($bresult);
     // Export UTF8 WITH BOM
     $tokenoutput = chr(hexdec('EF')).chr(hexdec('BB')).chr(hexdec('BF'));
     $tokenoutput .= "tid,firstname,lastname,email,emailstatus,token,language,validfrom,validuntil,invited,reminded,remindercount,completed,usesleft";
@@ -1731,7 +1730,7 @@ function tokensExport($iSurveyID)
     // Export token line by line and fill $aExportedTokens with token exported
     Yii::import('application.libraries.Date_Time_Converter', true);
     $aExportedTokens = array();
-    foreach($bresult as $brow)
+    while ($brow = $bresult->read())
     {
         if (trim($brow['validfrom']!=''))
         {