Update

<?php

include "koneksi.php";

$absen=$_POST['absen'];

$tugas1=$_POST['tugas1'];

$tugas2=$_POST['tugas2'];

$tugas3=$_POST['tugas3'];

$nilai_ujian=$_POST['nilai_ujian'];

$sql="UPDATE mhsnilai SET absen='absen',tugas1='tugas1', tugas2='tugas2', tugas3='tugas3', nilai_ujian='nilai_ujian'";

//$result=mysqli_query($conn,$sql) or die echo "wah error nih";
$result=mysql_query($sql);
//while ($row=mysqli_fetch_array($result)){


//}
header("Location:1IA01.php");


?>