Cek Login dan Session

<?php
include '_akses.php';
if (isset($_POST["--submit--"])) {

    $un = $_POST["un"];
    $pw = $_POST['pw'];

    $qSelectHash = mysqli_query($qConn , "SELECT * FROM users");
    $resultHash = mysqli_fetch_assoc($qSelectHash);
        $hashid = $resultHash['id_akses'];
        $hashkd = $resultHash['kd_akses'];

        $cekun = password_verify($un , $hashid );
        $cekpw = password_verify($pw , $hashkd);


        if ($cekun && $cekpw) {
            $qSelectTipe = mysqli_query($qConn , "SELECT * FROM users WHERE kd_akses='$hashkd' and id_akses='$hashid'");
            $resultTipe = mysqli_fetch_assoc($qSelectTipe);
            $cek = $resultTipe['tipe'];

            $qSelectAkses = mysqli_query($qConn , "SELECT * FROM _tipe WHERE kode='$cek'");
            $resultAkses = mysqli_fetch_assoc($qSelectAkses);
            $kode = $resultAkses['kode'];
            $tipe = $resultAkses['tipe'];

                session_start();
                $_SESSION["hashid"] = $hashid;
                $_SESSION["hashkd"] = $hashkd;
                $_SESSION["tipe"] = $tipe;

                if ($cek == $kode) {
                    echo '<script type="text/javascript">
                        alert("Selamat datang !");
                        window.location="'.$tipe.'/";
                    </script>';
                }
        }
        else {
            echo '<script type="text/javascript">
                        alert("Kode Akses dan Id Akses tidak sesuai !");
                        window.location="index.php";
                    </script>';

        }

}
 ?>