Membaik

<?php
  session_start() ;
  include "koneksi.php";

if(isset($_POST['login'])){

  $username = $_POST['username'];
  $password = md5($_POST['password']);

  $query = mysqli_query($conn, "SELECT * FROM user WHERE username ='$username' AND password='$password'");
  $data =  mysqli_fetch_array($query);
  $jml = mysqli_num_rows($query);

  if($jml > 0){
    $SESSION['username'] = $data['username'];
    $SESSION['password'] = $data['password'];

    header('Location: 1.php');
  }else {
    echo "<p align ='center'> Login Gagal </p>";
    echo "<meta http-equiv='refresh' content='2' url=login.php";
  }
}

?>