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我正在编写一个程序，1. 给出一个包含“UserID”和“Message”的表单。代码在这里：我正在编写一个程序，1. 给出一个包含“UserID”和“Message”的表单。代码在这里： <form display:inline-block; text align: left; id="form1" name="form1" action="notificationinsert.php" method="post"> <p> <label><u><b>Enter your notifications here:</b></u> The system will automatically use the date and time (EST) of your entry. If this is a general notification, enter 99 for userid.</label><br><br> </p> <p> <label for="userid">Userid:</label> <input type="text" name="userid" id="userid"> </p> <br></br> <p> <textarea name="notification" id="notification" cols="100" rows="10"></textarea> </p> <p> <p> <input type="submit" class="btn btn-primary btn-lg" name="submit" id="submit" value="Submit"> <p>  </p> </form> 然后，2. 将其发送到另一个 php 文件 notificationinsert.php（如上面的代码所示）。 notificationinsert.php 会将数据发送到我的数据库，并通过电子邮件将其发送给具有该用户 ID 的用户。我也贴了： // Include config file require_once "config.php"; // Import PHPMailer classes into the global namespace use PHPMailer\PHPMailer\PHPMailer; use PHPMailer\PHPMailer\SMTP; use PHPMailer\PHPMailer\Exception; require '/home/bitnami/PHPMailer/src/Exception.php'; require '/home/bitnami/PHPMailer/src/PHPMailer.php'; require '/home/bitnami/PHPMailer/src/SMTP.php'; date_default_timezone_set("America/Chicago"); //$tdate = date("r"); $tdate = date("Y-m-d H:i:s"); // Attempt insert query execution // Create prepared statement $sql = "INSERT INTO notifications (userid, date, notification) VALUES (:userid, :date, :notification)"; $stmt = $pdo->prepare($sql); // Bind parameters to statement $stmt->bindParam(':userid', $_REQUEST["userid"]); $stmt->bindParam(':date', $tdate); $stmt->bindParam(':notification', $_REQUEST['notification']); // Execute the prepared statement $stmt->execute(); $sql = "SELECT emailaddress FROM userprofile WHERE userid = :userid"; $stmt = $pdo->prepare($sql); // Bind parameters to statement $stmt->bindParam(':userid', $_REQUEST["userid"]); // Execute the prepared statement $stmt->execute(); $results = $stmt->fetch(); $emailaddress = $results["emailaddress"]; $notification = $_REQUEST['notification']; // Send email to user with the token in a link they can click on // Instantiation and passing `true` enables exceptions $mail = new PHPMailer(true); //Server settings $mail->SMTPDebug = SMTP::DEBUG_SERVER; // Enable verbose debug output $mail->isSMTP(); // Send using SMTP $mail->Host = 'email-smtp.us-east-1.amazonaws.com'; // Set the SMTP server to send through $mail->SMTPAuth = true; // Enable SMTP authentication $mail->Username = 'AKIAVH6N4Z2KTX7UPGEX'; // SMTP username $mail->Password = 'BIOJHb/5Hu68Cj5KpH6oxvS572ftDATnT8p67D+PRO+D'; // SMTP password $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS; // Enable TLS encryption; `PHPMailer::ENCRYPTION_SMTPS` encouraged $mail->Port = 587; // TCP port to connect to, use 465 for `PHPMailer::ENCRYPTION_SMTPS` above //Recipients $mail->setFrom('[email protected]', 'E'); $mail->addAddress($emailaddress); // Add a recipient $mail->addReplyTo('[email protected]', 'E'); // Content $mail->isHTML(true); // Set email format to HTML $mail->Subject = 'Notification from E'; $mail->Body = $notification; $mail->send(); header("location: welcome.php"); // Close connection unset($pdo); 最后，3. 一个新的页面（notification.php）把数据取出来，用表格表示： <div> <p><h3><center>My Notifications</center></h3></p> </div> <br> <br> <center><table style='border: solid 2px black; padding: 8px' width="100%"; > <col width = "20%"> <col width = "80%"> <tr> <th style='padding-top: 10px; padding-bottom: 10px; text-align:center; background-color: #2DA81F; color: white'>DATE</th> <th style="padding-top: 10px; padding-bottom: 10px; text-align:center; background-color: #2DA81F; color: white">Notification</th> </tr> </center> <?php class TableRows extends RecursiveIteratorIterator { function __construct($it) { parent::__construct($it, self::LEAVES_ONLY); } function current() { return "<td style='width:250px;border:1px solid black; text-align:left' height='25px'>" . parent::current(). "</td>"; } function beginChildren() { echo "<tr>"; } function endChildren() { echo "</tr>" . "\n"; } } // Include config file require_once "config.php"; $stmt = $pdo->prepare("SELECT date, notification FROM notifications WHERE userid = :userid1 or userid = :userid2"); $userid2 = "99"; // Bind parameters to statement $stmt->bindParam(':userid1', $_SESSION["userid"]); $stmt->bindParam(':userid2', $userid2); $stmt->execute(); // set the resulting array to associative $result = $stmt->setFetchMode(PDO::FETCH_ASSOC); foreach(new TableRows(new RecursiveArrayIterator($stmt->fetchAll())) as $k=>$v) { echo $v; } $pdo = null; ?> </table> </div> 但是，当我提交表单时，它说“无法连接到数据库”，这是为什么？

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