sql 중복데이터 그룹화해서 출력하기 질문입니다.

<?php
            $sql = "SELECT phone, name, COUNT(name) AS cnt FROM member WHERE phone<> '' GROUP BY phone HAVING cnt > 1;";
            $result = sql_query($sql);
            $num = 1;

             while ($row = sql_fetch_array($result)) {
                $hp_name = array();
                $sql2 = "SELECT phone, name  FROM `member` WHERE `phone` = '".$row['phone']."'";
                $result2 = sql_query($sql2);
                 while ($name_row = sql_fetch_array($result2)) {
                     $hp_name[] = $name_row['name'];
                     $name = implode("<br>",$hp_name);                    
                 }    
                
        $str .= "<tr>
                            <td>".$num."</td>
                            <td>".$row['phone']."</td>
                            <td>".$name."</td>
                    </tr>            
            ";
             $num++;
            }
        ?>
            <table>
                <tr>
                    <td>순번</td>
                    <td>연락처</ td>
                    <td>이름</td>
                </tr>
                <?php echo $str; ?>
            </table>