Untitled

 <!DOCTYPE html>
<html>
<head>
</head>
<body>
<?php
	session_start();
	$conn = mysqli_connect("localhost","root","");
	mysqli_select_db($conn, "test");
?>

<?php
if (isset($_GET['wyloguj'])==1)
{
	$_SESSION['zalogowany'] = false;
	session_destroy();
}
?>

<?php
if (isset($_POST['login_button']))
{
	$login = $_POST['login'];
	$password = $_POST['password'];

	if (mysqli_num_rows(mysqli_query($conn, "SELECT login, password FROM user WHERE login = '".$login."' AND password = '".$password."';")) > 0)
	{
		mysqli_query($conn, "UPDATE `user` SET (`login_time` = '".time()."') WHERE login = '".$login."';");

		$_SESSION['zalogowany'] = true;
		$_SESSION['login'] = $login;
	}
	else echo "Something went wrong. Try again!";
}

if (isset($_SESSION['zalogowany'])==true)
{
	echo "Hello <b>".$_SESSION['login']."</b><br><br>";

	echo '<a href="?wyloguj=1">[Logout]</a>';
}
?>

<?php if (isset($_SESSION['zalogowany'])==false): ?>
	<form method="POST" action="login.php">
		<b>Login:</b> <input type="text" name="login"><br>
		<b>Password:</b> <input type="password" name="password"><br>
		<input type="submit" value="Login" name="login_button">
	</form>
<?php endif; ?>

<?php mysqli_close($conn); ?>
</body>
</html>