我的用户在表单中提交一些基本信息后，我如何让新创建的用户 ID 回显到标题（重定向）页面上的隐藏字段？
第一个表格包含基础名称、电话、电子邮件输入。当用户提交表单（到数据库）时，AI“userID”列生成他们唯一的“userID”。
我需要那个唯一的 ID 来回显到标题（重定向）页面上的隐藏字段，然后用户将在其中上传他们的个人资料照片。
新用户表格：
<h1>New User Form</h1>
<form action="newUser_formHandler.php" method="POST" >
<input name="userName" placeholder="Enter Name"><br><br>
<input name="userPhone" placeholder="Enter Phone"><br><br>
<input name="userEmail" placeholder="Enter Email"><br><br>
<input type="submit" name="submit" value="Submit">
</form>
新用户表单处理程序：
<?php include './secure/dbKey.php';?>
<?php
if(isset($_POST['submit'])){
$userName = $_POST['userName'] ;
$userPhone = $_POST['userPhone'] ;
$userEmail = $_POST['userEmail'] ;
$newUser = "insert into Users (userName, userPhone, userEmail)
values('$userName', '$userPhone', '$userEmail')";
$run = mysqli_query($conn,$newUser) or die(mysqli_error()) ;
//Page Re-direct after form submission
header('location: /profilePhoto_UploadPage.php');
}
?>
头像上传页面：
<?php include './secure/dbKey.php';?>
<html>
<head>
<title>Profile Photo Upload Page</title>
</head>
<body>
<h1>Congratulations!</h1>
<h2>Your profile was succesfully created!</h2>
<a>Please upload a photo to complete your profile:</a><br><br>
<form action="photoUpload_Handler.php" method="post" enctype="multipart/form-data">
<input type="hidden" name="userID" id="userID" value="<?php echo $userID; ?>">
<input type="file" name="fileToUpload" id="fileToUpload"><br><br>
<input type="submit" value="Upload Image" name="submit">
</form>
</body>
</html>
$conn->insert_id此外，无论您遵循的是什么教程或指南，都已经严重过时或非常糟糕。使用 prepared statements 并遵循 good tutorial
$stmt = $conn->prepare(
"INSERT INTO `Users` (`userName`, `userPhone`, `userEmail`) VALUES (?, ?, ?)"
);
$stmt->bind_param(
"sss",
$_POST["userName"],
$_POST["userPhone"],
$_POST["userEmail"]
);
$stmt->execute();
header(
"Location: /profilePhoto_UploadPage.php?" .
http_build_query(["userID" => $conn->insert_id])
);
exit();
在二级页面上，您将使用查询参数
<input
type="hidden"
name="userID"
id="userID"
value="<?= htmlspecialchars($_GET['userID']) ?>"
/>
使用会话同样简单
session_start();
// same mysqli code as above
$_SESSION['userID'] = $conn->insert_id;
header('Location: /profilePhoto_UploadPage.php');
exit;
在次要页面上，您实际上不需要它，因为您发布到的任何页面也可以阅读会话
// photoUpload_Handler.php
session_start();
$userID = $_SESSION['userID'];