if (isset($_POST["kullanici_giris"])) {
    if (isset($_SESSION["guvenlik"]["kullanici_giris"]) == "") {
        exit("izinsiz işlem tespit edildi.");
    }
    $kadi = $_POST["kadi"];
    $sifre = $_POST["sifre"];
    $son_giris = tr_tarih("Y-m-d H:i:s");
    if (empty($kadi) || empty($sifre)) {
        $_SESSION["kullanici_giris"] = "bos";
        header("Location:../" . yonetim . "/giris.html");
        exit;
    }
    $varmi = $db->prepare("SELECT * FROM kullanici WHERE BINARY kadi = ? AND sifre = ?");
    $varmi->execute([$kadi, $sifre]);
    if ($varmi->rowCount()) {
        $KSonuc = $varmi->fetch(PDO::FETCH_ASSOC);
        $sorgu = $db->prepare("UPDATE kullanici SET\r\n\t\t\t\tson_giris = ?\r\n\t\t\t\tWHERE id = ?");
        $guncelle = $sorgu->execute([$son_giris, $KSonuc["id"]]);
        $_SESSION["Yonetim_Id"] = $KSonuc["id"];
        $_SESSION["Yonetim_Kadi"] = $KSonuc["kadi"];
        $_SESSION["Yonetim_Adi"] = $KSonuc["isim"];
        $_SESSION["Yonetim_Sifre"] = $KSonuc["sifre"];
        $_SESSION["rutbe"] = $KSonuc["rutbe"];
        if (isset($_POST["beni_hatirla"])) {
            setcookie("Yonetim_Kadi", $KSonuc["kadi"], strtotime("+1 day"), "/", NULL, NULL, true);
            setcookie("Yonetim_Sifre", $KSonuc["sifre"], strtotime("+1 day"), "/", NULL, NULL, true);
        } else {
            setcookie("Yonetim_Kadi", $KSonuc["kadi"], strtotime("-1 day"), "/", NULL, NULL, true);
            setcookie("Yonetim_Sifre", $KSonuc["sifre"], strtotime("-1 day"), "/", NULL, NULL, true);
        }
        $_SESSION["kullanici_giris"] = "yes";
        header("Location:../" . yonetim . "/index.html");
        exit;
    }
    $_SESSION["kullanici_giris"] = "no";
    header("Location:../" . yonetim . "/giris.html");
    exit;
}

$_SESSION["guvenlik"] = ["kullanici_giris" => kod()];