PHP spreadsheet writer writing variables to excel -

i trying write variables array excel cannot write in instances

code below

$workbook =new spreadsheet_excel_writer(); $workbook->send("response.xls"); $row=1; $col=1; $workbook->setversion(8); $worksheet =& $workbook->addworksheet('my sheet '); $allquestions = $questions->getquestions(); foreach ($allquestions $qkey=>$qval) {     foreach ($studentresponses $rval){         $astresp= $rval->getresponse($qkey);         //$worksheet->write($row,$col,'hiii');         $worksheet->write($row, $col, $astresp);         $col++;     }     $row++;     $col=1; } $workbook->close(); 

the $astresp when changed 'hihi' prints hihi in excel when remains $astresp fails open excel.