<?php
$server = 'localhost';
$username = 'root';
$password = '';
$db = 'db_yuungaji';

$conn = mysqli_connect($server,$username,$password,$db);

if (!$conn) {

die("Failed Connect To Database");

} else {

echo "Success Connect To Database";

}
if (isset($_POST['login-pengajar'])) `{`
    $username = "usernamer-pengajar";
    $password = "password-pengajar";
    $sql_login = mysqli_query($conn, "SELECT * FROM tbl_pengajar WHERE username = '$username' AND password = '$password'");
   if(mysqli_num_rows($sql_login)>0) {
      $row_akun = mysqli_fetch_array($sql_login);
      $_SESSION['id_pengajar'] = $row_akun['id_pengajar'];
      $_SESSION['username'] = $row_akun['username'];
      echo "Login Success";
   }else {
      echo "Login Failed";
   }

}
 ?>