$db = mysqli_connect('localhost','root','','db_registerlogin');

	if(isset($_POST['login_btn'])){
		session_start();
		$email = mysqli_real_escape_string($db,$_POST['email']);
		$password = mysqli_real_escape_string($db,$_POST['password']);
		$password = md5($password);
		$sql = "SELECT * FROM users WHERE email = '$email' AND password = '$password'";
		$result = mysqli_query($db,$sql);
		if(mysqli_num_rows($result)==1){
			$user = mysqli_fetch_assoc($result);
			$_SESSION['message'] = 'You are now logged in!';
			$_SESSION['first_name'] = $user['first_name'];
			$_SESSION['last_name'] = $user['last_name'];
			header("location: home.php");
		} else{
			//failed
			$_SESSION['error'] = 'Credentials didnot match!';
		}
	}