<?php

$servername = "localhost";
$username = "root";
$password = "paproc123";
$dbname = "sklep";

$value = $_POST['nickname'];
$kod = $_POST['post'];

$conn = new mysqli($servername, $username, $password, $dbname);
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT kod FROM kody WHERE kod = '$kod'";
$result = $conn->query($sql);

if($result == $_POST['kod'])
{
     $sql = "INSERT INTO sklep (nickname, kod, ranga) VALUES ('$value', 'VOUCHER', vip)";
	print "<meta http-equiv=\"refresh\" content=\"0;URL=index.php?buy=true\">";
}
else
{
print "<meta http-equiv=\"refresh\" content=\"0;URL=index.php?buy=false\">".PHP_EOL;
}

$conn->close();
?>