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

$rusername = mysqli_real_escape_string($conn, $_POST['username']);
$rpassword = mysqli_real_escape_string($conn, password_verify($_POST['password'], PASSWORD_DEFAULT));

$query = "SELECT * FROM userinfo WHERE username='$rusername' AND password='$rpassword'";
$sql = mysqli_query($conn, $query);

  if(mysqli_num_rows($sql) == 1)
    {
      $row = mysqli_fetch_assoc($conn, $sql);
      $_SESSION['username'] = $row['username'];
      header('Location: member.php');
      exit();
    }
  else
    {
      $errMsg = "Username or password wrong, please check and try again!";
    }  };