Materi 9 Membuat file skirpupdate.php Perintah Update

<?php
include "koneksi.php";
$id=$_POST['id'];
$nama=$_POST['nama'];
$alamat=$_POST['alamat'];
$tahun=$_POST['tahun'];
$kelas=$_POST['kelas'];
$rombel=$_POST['rombel'];



$sql = "update siswa set id='$id', nama='$nama',alamat='$alamat', tahun='$tahun', kelas='$kelas', rombel='$rombel' where id='$id'";
if(mysqli_query($dbconnect, $sql)){
    echo "Records were updated successfully.";
    echo "<script> location.replace('tampil.php'); </script>";
} else {
    echo "ERROR: Could not able to execute $sql. " . mysqli_error($dbconnect);
}

// Close connection
mysqli_close($dbconnect);

?>