添加PHP代码时未显示模态

Question

我需要帮助，使用data-target="#edit<?php echo $row['user_id']; ?>"时不会显示我的模态，但是删除<?php echo $row['user_id']; ?>时会显示模态，但显示mysqli无法提取的错误。我需要

这是我的代码。

<div class="container" style="margin-top: 30px">
            <table id="myTable" class="table  table-bordered table-hover">
              <thead>
                <tr>                  
                  <th>Last Name</th>
                  <th>First Name</th>
                  <th>Middle Name</th>
                  <th>Date of Birth</th>
                  <th>Email</th>
                  <th>Contact</th>
                  <th>Actions</th>
                </thead>
                <tbody>

                  <?php

                  include_once "../config.php";

                  if ($link-> connect_error) {
                    die("Connection failed: " . $link-> connect_error);
                  }

                  $sql = "SELECT user_id, lname, fname, mname, bday, email, contact FROM users";
                  $result = $link-> query($sql);

                  if ($result-> num_rows > 0) {
                    while ($row = $result -> fetch_assoc()) {
                      echo "<tr><td>" . $row["lname"] . "</td><td>" . $row["fname"] . "</td><td>" . $row["mname"] . "</td><td>" . $row["bday"] . "</td><td>" . $row["email"] . "</td><td>" . $row["contact"] . "</td>"; ?>
                      <td>
                        <a data-placement="top" data-toggle="tooltip" title="View"><button class="btn btn-success btn-xs" data-title="View" data-toggle="modal" data-target="#view">View</button></a>
                        <a data-placement="top" data-toggle="tooltip" title="Edit"><button class="btn btn-info btn-xs" data-title="Edit" data-toggle="modal" data-target="#edit<?php echo $row['user_id']; ?>">Edit</button></a>
                        <a data-placement="top" data-toggle="tooltip" title="Delete"><button class="btn btn-danger btn-xs" data-title="Delete" data-toggle="modal" data-target="#delete">Delete</button></a>
                      </td>

                      <?php
                      echo "</tr>";
                    }
                    echo "</table>";
                  }
                  else {
                    echo "0 result";
                  }

                  $link-> close();

                  ?>

                </tbody>

              </table>

            </div>
            <div class="modal fade" id="edit<?php echo $row['user_id']; ?>" tabindex="-1" role="dialog" aria-labelledby="edit" aria-hidden="true">
              <div class="modal-dialog">
                <div class="modal-content">
                  <div class="modal-header">
                    <button type="button" class="close" data-dismiss="modal" aria-hidden="true"><span class="glyphicon glyphicon-remove" aria-hidden="true"></span></button>
                    <h4 class="modal-title" id="Heading">Edit User Details</h4>
                  </div>
                  <div class="modal-body">
                    <?php
                    $edit=mysqli_query($conn, "select * from users where user_id='".$row['user_id']."'");
                    $erow=mysqli_fetch_array($edit);
                    ?>
                    <form method="POST" action="edit_users.php?user_id=<?php echo $erow['user_id']; ?>">
                      <div class="form-group">
                        <p>First Name</p>
                        <input class="form-control " type="text" value="<?php echo $erow['fname'];?>">
                      </div>
                      <div class="form-group">
                        <p>Middle Name</p>
                        <input class="form-control " type="text" value="<?php echo $erow['mname'];?>">
                      </div>
                      <div class="form-group">
                        <p>Last Name</p>
                        <input class="form-control " type="text" value="<?php echo $erow['lname'];?>">
                      </div>
                    </div>
                    <div class="modal-footer ">
                      <button type="button" class="btn btn-warning btn-lg" style="width: 100%;"><span class="glyphicon glyphicon-ok-sign"></span>Update</button>
                    </div>
                  </div>                  
                </div>                
              </div>

我的edit_users.php

<?php
    include('../config.php');

    $id=$_GET['user_id'];

    $fname=$_POST['fname'];
    $mname=$_POST['mname'];
    $lname=$_POST['lname'];
    $bday=$_POST['bday'];
    $address=$_POST['address'];
    $gender=$_POST['gender'];
    $contact=$_POST['contact'];
    $email=$_POST['email'];
    $userlvl=$_POST['userlvl'];

    mysqli_query($conn, "update users set fname='$fname', mname='$mname', lname='$lname', bday='$bday', address='$address', gender='$gender', contact='$contact', email='$email', userlvl='$userlvl' where user_id='$id'");
    header('location: users.php');

?>

我是编码的新手，到目前为止，我只是从网上观看视频或代码示例，从登录到使用引导程序进行设计，然后在数据库中添加用户，到目前为止，我所遇到的一些问题已经解决了，示例是在哪一页可以重定向到该用户是管理员还是仅仅是用户，但是我现在遇到的这个问题对我来说是如此棘手，因为我仍在上学，因此我需要进行2天的上下班时间。请帮忙。