在php代码中echo不工作意味着它不从数据库中获取数据？ mydonor_submit是按钮，其中id：“mmyBtn”data-target：“＃myModal”：

Error is showing like thismy modal-content is working but the fetching data is not showing in the popup modal. please help me to solve the problem.

<?php
    if(isset($_POST['mydonor_submit']))
        {
            $var = $_POST['bloodgroup2'];
            $query = "select * from donate where 
bloodgroup='$var'";
            $result = mysqli_query($con,$query);
            $row = 
 mysqli_fetch_array($result,MYSQLI_ASSOC);
        }
?>

    <div id="myModal" class="modal">

      <!-- Modal content -->
      <div class="modal-content">
        <span class="close">&times;</span>
        <p><label> Full Name :</label><?php echo $row['fullname'];?></p>

      </div>

    </div>

No error is showing