I'm a little confused, PHP says $results is a non-object of the mysqli class

Question

I\'m trying to fetch results using mysqli->fetch_row() (or fetch_object(), fetch_array()), yet when I go to run the code at run time it gives me the following error:

Answer 1

You script is lacking error checking, and therefore the error in the query is not handled.

    $query = "SELECT user, password FROM Users 
    WHERE user = '$user' AND password = '$pass' " ;
    //           ^ quotes needed     

    echo $query;

    $results = $db->query($query);

    // handle a error in the query
    if(!$results)
      die($db->error);

    while ($row = $results->fetch_row()){
        echo htmlspecialchars($row->user);
        echo htmlspecialchars($row->password);
    }