29.4

<?php
 include 'lib/library.php';

 if ($_SERVER['REQUEST_METHOD'] == 'POST') {
  $nis = $_POST['nis'];
  $nama_lengkap = $_POST['nama_lengkap'];
  $jenis_kelamin = $_POST['jenis_kelamin'];
  $kelas = $_POST['kelas'];
  $jurusan = $_POST['jurusan'];
  $alamat = $_POST['alamat'];
  $golongan_darah = $_POST['goldar'];
  $nama_ibu = $_POST['namaibu'];

  $sql = "UPDATE siswa SET nis = '$nis',
     nama_lengkap = '$nama_lengkap',
     jenis_kelamin = '$jenis_kelamin',
     kelas = '$kelas',
     jurusan = '$jurusan',
     alamat = '$alamat',
     golongan_darah = '$golongan_darah',
     nama_ibu = '$nama_ibu' WHERE nis = '$nis' ";

  $mysqli->query($sql) or die ($mysqli->error);

  header('location: index.php');
 }

 $nis = $_GET['nis'];

 if (empty($nis)) header('location: index.php');

 $sql = "SELECT * FROM siswa WHERE nis = '$nis' ";
 $query = $mysqli->query($sql);
 $siswa = $query->fetch_array();

 if (empty($siswa)) header('location: index.php');

  include 'views/v_tambah.php';
?>