proses_ubah_paket.php

<?php
if($_POST){
    $id=$_POST['id'];
    $jenis=$_POST['jenis'];
    $harga=$_POST['harga'];
    if(empty($jenis)){
        echo "<script>alert('jenis paket tidak boleh kosong');location.href='tambah_paket.php';</script>";
 
    } elseif(empty($harga)){
        echo "<script>alert('harga tidak boleh kosong');location.href='tambah_paket.php';</script>";
    } else {
        include "koneksi.php";  
        $update=mysqli_query($conn,"update paket set jenis='".$jenis."',
             harga='".$harga."' where id = '".$id."'")
             or die(mysqli_error($conn));
            if($update){
                echo "<script>alert('Sukses update paket');location.href='tampil_paket.php';</script>";
            } else {
                echo "<script>alert('Gagal update paket');location.href='ubah_paket.php?id="
                .$id."';</script>";
            }
        }
        
    } 
?>