目前，我使用CRUD功能創建一個系統。我的更新功能有一些問題。問題是，它會在view_task.php顯示錯誤，例如：1） 未定義的索引： report_id 在第 7 行 2） 未定義的變量： task_name 在第 50 行問題是，當我檢查數據庫時，數據已更新。以下是我當前的代碼：儀表板.php   echo "<form method = 'post' action = 'view_task/view_task.php'>";     echo "<input type = 'hidden' name = 'report_id' value = '".$report_id."'>";     echo "<button type = 'submit' class='btn-primary'>View</button>";   echo "</form>";view_task.php<?php  require_once "../../../../config/configPDO.php";  require_once "../../../../config/check.php";  $report_id = $_POST['report_id']; //line 7  $sql = "SELECT * FROM ot_report LEFT JOIN ot_users ON ot_report.badgeid = ot_users.badgeid LEFT JOIN ot_team ON ot_team.team_id = ot_users.team_id WHERE report_id = :report_id";  $query = $conn->prepare($sql);  $query->execute(array(':report_id' => $report_id));  while($row = $query->fetch(PDO::FETCH_ASSOC)){      $report_id = $row["report_id"];      $task_name = $row["task_name"];  }?><form action="update_task_name.php" method="POST">  <td><b>Task Name</b></td>  <td colspan = '2'><input type="text" class="form-control" name="task_name" value="<?php echo $task_name; ?>"/></td> //line 50  <input type="hidden" name="report_id" value="<?php echo $report_id ?>">   <td><input type="submit" class="btn btn-primary btn-block" value = "Save" onclick="confirm('Are you sure?')"></td></form>update_task_name.php<?php    require_once '../../../../config/configPDO.php';    $update = "UPDATE ot_report SET task_name = :task_name WHERE report_id = :report_id";    $stmt = $conn->prepare($update);    $stmt->bindParam(':task_name', $_POST['task_name']);    $stmt->bindParam(':report_id', $_POST['report_id']);    $stmt->execute();    class Result {}    $response = new Result();    $response->result = 'OK';    $response->message = 'Update successful';    header("Location: view_task.php");?>任何人都可以幫我解決這個問題嗎？謝謝