//Set font Size
$objPHPExcel->getActiveSheet()->getStyle("A1:I".$highestRow)->getFont()->setSize(4);

//Set Row size
$objPHPExcel->getActiveSheet()->getDefaultRowDimension()->setRowHeight(6);

//Loop out data into cells (create excel)
while($value = $stmt->fetch()){

    //Set start Column
    $column = "A";

    //Set row height
    $objPHPExcel->getActiveSheet()->getRowDimension($row)->setRowHeight(6);

//Set cell values
    $objPHPExcel->getActiveSheet()->SetCellValue($column++.$row, $value['value']);