如何以多页形式存储会话信息并将信息发送到 mySQL 表

问：

在我从事的一个项目中，我遇到了最长的障碍。我有一个多页表单，我从最终用户那里收集多个页面的数据，并在最后将它们提交到我的数据库中，但是当我检查表格时没有显示任何数据。

第 1 页的表单如下所示

<?php
session_start();
// If the user is not logged in redirect to the login page...
if (!isset($_SESSION['loggedin'])) {
    header('Location: login.html');
    exit();
}
?>

表格 2 看起来像这样......

<?php
session_start();
// If the user is not logged in redirect to the login page...
if (!isset($_SESSION['loggedin'])) {
    header('Location: login.html');
    exit();
}
//Fetching values from form 1
foreach ($_POST as $key => $value) {
 $_SESSION['post'][$key] = $value;
 }

?>

表格 3 如下所示

<?php
session_start();
// If the user is not logged in redirect to the login page...
if (!isset($_SESSION['loggedin'])) {
    header('Location: login.html');
    exit();
}
//Fetching values from form 2
foreach ($_POST as $key => $value) {
 $_SESSION['post'][$key] = $value;
 }

?>

填写表单如下所示

<?php
 code.
session_start();
// If the user is not logged in redirect to the login page...
if (!isset($_SESSION['loggedin'])) {
    header('Location: login.html');
    exit();
}
//Fetching values from form 3
foreach ($_POST as $key => $value) {
 $_SESSION['post'][$key] = $value;
 }

 extract($_SESSION['post']); // Function to extract array.

 $DATABASE_HOST = 'localhost';
 $DATABASE_USER = 'root';
 $DATABASE_PASS = '';
 $DATABASE_NAME = 'qraccounts';
 // Try and connect using the info above.
 $con = mysqli_connect($DATABASE_HOST, $DATABASE_USER, $DATABASE_PASS, $DATABASE_NAME);
 if (mysqli_connect_errno()) {
     // If there is an error with the connection, stop the script and display the error.
     die ('Failed to connect to MySQL: ' . mysqli_connect_error());
 }
    if ($stmt = $con->prepare('INSERT INTO logindata (database_value1, database_value2, database_value3, database_value4, database_value5) VALUES (?, ?, ?, ?, ?)')) {
 $stmt->bind_param('sssss', $_POST['value1'], $_POST['value2'], $_POST['value3'], $_POST['value4'], $_POST['value5']);
 $stmt->execute();
}

?>

是否有任何事情会阻止我在多个会话中将用户数据存储在我的 SQL 表中？

我的数据库是一个包含 id、电子邮件、密码（哈希）、database_value1、database_value2、database_value3、database_value4 database_value5的表。我是否需要像在注册页面中那样存储更早的数据？