@$query = "SELECT * FROM user_tb WHERE username='$_POST[username]' AND password='$_POST[password]'";
@$results =  executeQuery($query); //Variable results executing variable query
@$chek=mysql_num_rows($query);
    if ($chek>0) {
        @$o=mysql_fetch_array($query); //getting data from variable query
        $_SESSION['la-username']=$o['username']; //saving username from user_tb to session la-username
        $_SESSION['la-name']=$o['name']; //saving name from user_tb to session la-username
        $_SESSION['la-access']=$o['access']; //saving access from user_tb to session la-username
        switch ($o['access']) {
            case 'admin': echo "<script>document.location.href='admin/';</script>"; break;
            case 'cashier': echo "<script>document.location.href='cashier/';</script>"; break;
            case 'manager': echo "<script>document.location.href='manager/';</script>"; break;
        }
    }else{
        echo "<script>alert('Username and password not match');</script>";
    }
}