while($row=$result->fetch_array(MYSQLI_ASSOC)){
echo "<div class='card'>";
echo "<h5 class='card-header'>【".$row['留言編號']."】".$row['姓名']."</h5>";
echo "<div class='card-body'>";
echo "<h5 class='card-title'>".$row['日期時間']."</h5>";
echo "<p class='card-text'>".$row['留言']."</p>";
echo "</div></div>";
}