<?php

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

$value = $_POST['nickname'];


$conn = mysqli_connect($servername, $username, $password, $dbname);
if (!$conn) {
    die("Connection failed: " . mysqli_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)";
	 $sql = "DELETE kod FROM kody WHERE kod = "$kod"";
	 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;
}
if (mysqli_query($conn, $sql)) {

} else {
    echo "" . $sql . "" . mysqli_error($conn);
}

mysqli_close($conn);
?>