Form not updating to db, PHP. Kind of confused why - php

Question

I'm having a small college project about discussion room service. I'm stuck at updating the database of the rooms.
I already used mysqli_error() function, and that didn't return any error, I wonder why.
Here's my form code:
<?php
//Tahap 1. Buat koneksi Database
$host = "localhost";
$user = "root";
$pass = "";
$name = "pinjamruang";
$koneksi = mysqli_connect($host, $user, $pass, $name);
//Periksa apakah koneksi berhasil
if(mysqli_connect_errno()){
echo "Error: ";
echo mysqli_connect_error();
echo "<br /> Error Code: ";
echo mysqli_connect_errno();
die();
}
$sql = "SELECT * FROM ruangan";
$keranjang = mysqli_query($koneksi, $sql);
$row = mysqli_fetch_assoc($keranjang);
?>
<h1 class="page-header">Edit Karyawan</h1><br>
<form class="form-horizontal" action="process/process-ruangan-edit.php" method="post" enctype="multipart/form-data">
<div class="form-group">
<label for="inputKodeRuangan" class="col-sm-2 control-label">Kode Ruangan</label>
<div class="col-sm-10">
<input type="text" name="kode" class="form-control" id="inputKodeRuangan" value="<?php echo $row['kode'];?>" placeholder="Kode Ruangan">
</div>
</div>
<div class="form-group">
<label for="inputJumlahMeja" class="col-sm-2 control-label">Jumlah Meja</label>
<div class="col-sm-10">
<input type="number" name="meja" class="form-control" id="inputJumlahMeja" value="<?php echo $row['meja'];?>"placeholder="Jumlah Meja">
</div>
</div>
<div class="form-group">
<label for="inputJumlahKursi" class="col-sm-2 control-label">Jumlah Kursi</label>
<div class="col-sm-10">
<input type="number" name="kursi" class="form-control" id="inputJumlahKursi" value="<?php echo $row['kursi'];?>"placeholder="Jumlah Kursi">
</div>
</div>
<div class="form-group">
<label for="inputStatus" class="col-sm-2 control-label">Status</label>
<div class="col-sm-10">
<select name="status" class="form-control" id="inputStatus">
<option value="available">Tersedia</option>
<option value="unavailable">Tidak Tersedia</option>
</select>
</div>
</div>
<div class="form-group">
<label for="inputNote" class="col-sm-2 control-label">Catatan Khusus</label>
<div class="col-sm-10">
<input type="text" name="note" class="form-control" id="inputNote" value="<?php echo $row['note'];?>"placeholder="Catatan Khusus">
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<input type="hidden" name="id" value="<?php echo $row2['id']; ?>" />
<button type="submit" class="btn btn-primary">Update</button>
</div>
</div>
</form>
And here's my process code:
<?php
// Tahap 1. Buat koneksi database
$host = "localhost";
$user = "root";
$pass = "";
$name = "pinjamruang";
$koneksi = mysqli_connect($host, $user, $pass, $name);
//Periksa apakah koneksi berhasil
if(mysqli_connect_errno()){
echo "Error: ";
echo mysqli_connect_error();
echo "<br />Error Code: ";
echo mysqli_connect_errno();
die();
}
//Tahap 2. Lakukan Query SQL
// Dapatkan data dari form dan dibersihkan
$kode = mysqli_real_escape_string($koneksi, $_POST['kode']);
$meja = mysqli_real_escape_string($koneksi, $_POST['meja']);
$kursi = mysqli_real_escape_string($koneksi, $_POST['kursi']);
$status = mysqli_real_escape_string($koneksi, $_POST['status']);
$note = mysqli_real_escape_string($koneksi, $_POST['note']);
$sql = "UPDATE ruangan
SET kode = '$kode',
kursi = $kursi,
meja = $meja,
status = '$status',
note = '$note'
WHERE id = $_POST[id]";
mysqli_query($koneksi,$sql);
echo mysqli_error($koneksi);
//header('Location: ../index.php?page=ruangan');
?>
Any help would be much appreciated, I'm still really new at PHP and basically programming so, thanks a lot!

Answer 1

In your form code you are referencing $row2 which hasn't been defined yet.
<input type="hidden" name="id" value="<?php echo $row2['id']; ?>" />
You should change it to
<input type="hidden" name="id" value="<?php echo $row['id']; ?>" />