<?php
session_start();
$username = $_POST['username'];
$password = $_POST['password'];

$przycisk = $_POST['zaloguj'];

if($przycisk)
{
if($username&&$password)
{
mysql_connect("localhost", "root", "") or die(mysql_error());
mysql_select_db("strona");

$query = mysql_query("SELECT * FROM `users` WHERE `username` = '$username' AND `password` = '$password'");
}
while($row = mysql_fetch_array($query))
{
$dbusername = $row['username'];
$dbpassword = $row['password'];
}
if($dbusername == $username && $dbpassword == $password)
{
die("Zalogowany pomyślnie!<br> <a href = 'panelgracza.php'>Kliknij tutaj</a>, aby przejść do panelu.");
$_SESSION['username'] = $username;
}
else die ("Wpisz login i hasło!");
}