Konwersja dany z MySQL do Excel

<?php
    require_once("database.php");

    $records = $conn->prepare("SELECT * FROM users");
    $records->execute();

    $output = '';

    if($records->rowCount() > 0)
    {

        $output .= '<table><thead><tr><th>Id</th><th>first_name</th><th>last_name</th><th>email</th><th>city</th><th>avatar</th></tr></thead><tbody>';
        while($results = $records->fetch(PDO::FETCH_OBJ))
        {
            $output .= '
            <tr>
                <td>'.$results->id.'</td>  
                <td>'.$results->first_name.'</td>  
                <td>'.$results->last_name.'</td>  
                <td>'.$results->email.'</td>  
                <td>'.$results->city.'</td>
                <td>'.$results->avatar.'</td>
            </tr>';
        }

        $output .= '</tbody></table>';

        header('Content-Type: application/xls');
        header('Content-Disposition: attachment; filename=LiveSearch.xls');

        echo $output;
    }
?>