สอบถามเกี่ยวกับการ import excel to mysql หน่อยครับ

$uploadfile = $_FILES['uploadfile']['tmp_name'];

require 'PHPExcel/Classes/PHPExcel.php';
require_once 'PHPExcel/Classes/PHPExcel/IOFactory.php';

$objExcel = PHPExcel_IOFactory::load($uploadfile);
foreach ($objExcel->getWorksheetIterator() as $worksheet) {
    $highestrow = $worksheet->getHighestRow();

    for ($row = 0; $row <= $highestrow; $row++) {
        $name = $worksheet->getCellByColumnAndRow(0, $row)->getValue();
        $email = $worksheet->getCellByColumnAndRow(1, $row)->getValue();

        if ($email != '') {
            $insertqry = "INSERT INTO `user`( `first_name`, `last_name`) VALUES ('$name','$email')";
            $insertres = mysqli_query($con, $insertqry);
        }
    }
}
header('Location: index.php');