proses.php

<?php

// koneksi
require_once "config/koneksi.php";

// proses tambah
if (isset($_POST['tambah'])) {

    // tampung inputan bk_tamu
    $nama       = trim(mysqli_real_escape_string($con, $_POST['nama']));
    $email      = trim(mysqli_real_escape_string($con, $_POST['email']));
    $komentar   = trim(mysqli_real_escape_string($con, $_POST['komentar']));

    // query tambah data (SQL)
    mysqli_query($con, "INSERT INTO komentar
                    (id, nama, email, komentar) VALUES
                    (null, '$nama', '$email', '$komentar')") or die(mysqli_error($con));

    // jika berhasil tampilkan alert dan arahkan ke halaman bk-tamu.php
    echo "<script>alert('Data berhasil ditambahkan.'); window.location = 'bk-tamu.php';</script>";
} else if (isset($_POST['edit'])) {

    // tampung inputan bk_tamu
    $id         = $_POST['id'];


    $nama       = trim(mysqli_real_escape_string($con, $_POST['nama']));
    $email      = trim(mysqli_real_escape_string($con, $_POST['email']));
    $komentar   = trim(mysqli_real_escape_string($con, $_POST['komentar']));

    // query edit data (SQL)
    mysqli_query($con, "UPDATE komentar SET
        nama        = '$nama',
        email       = '$email',
        komentar    = '$komentar'
        WHERE id    = $id
    ") or die(mysqli_error($con));

    // jika berhasil tampilkan alert dan arahkan ke halaman bk-tamu.php
    echo "<script>alert('Data berhasil diubah.'); window.location = 'bk-tamu.php';</script>";
}