PHP 여러변수 이어쓰기 채택완료

<table class="table table-bordered">

                <tr>

                    <th width="13%">시작</th>

                    <th width="13%">종료</th>

                    <th width="13%">총 시간</th>

                </tr>

 

                <?php                    

                    while($row = sqlsrv_fetch_array($result, SQLSRV_FETCH_ASSOC))

                    {

                ?>

                        <tr>

                            <td><?php echo $row["StartTime"]; ?> </td>

                            <td><?php echo $row["EndTime"]; ?> </td>

                            <td><?php echo $row["StartTime"].$row["EndTime"]; ?> </td>

                        </tr>

                <?php

                    }

                ?>

</table>

$output .='

    <div class="table-responsive">

        <table class="table table-bordered">';

        while($row = sqlsrv_fetch_array($result, SQLSRV_FETCH_ASSOC))  

        {

            $output .='

                <tr>

                    <td width ="30%"><lable>시작 시간</lable></td>

                    <td width ="70%"><lable>'.$row["StartTime"].'</lable></td>

                </tr>

 

                <tr>

                    <td width ="30%"><lable>종료 시간</lable></td>

                    <td width ="70%"><lable>'.$row["EndTime"].'</lable></td>

                </tr>

 

                <tr>

                    <td width ="30%"><lable>총 시간</lable></td>

                    <td width ="70%"><lable>'.???.'</lable></td>

                </tr>

            ';

        }

$output .= "</table></div>";

echo $output;