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我想为一个大学数据库系统做一个个人资料页面。我遇到了麻烦，当我把它从登录页面重定向到主页。
在下面的php代码中，我把表单连接到数据库，然后把用户ID信息赋给$_ SESSION ['userid ']，这样我就可以检查ID和密码是否正确。下面是连接到登录表单的php：

<?php
session_start();

// mysql base configuration
define('DB_SERVER', 'localhost:3306');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', '');
define('DB_DATABASE', 'universitydatabse');
$db = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE);

if($db===false)
{
    die("connection error");
}

if($_SERVER["REQUEST_METHOD"] == "POST") {
    //id and password sent from form

    $name = $_POST['bannerid']; // bannerid is the name in form
    
    $pass = $_POST['password']; //password is the name in form

    //check if input matches database
    $sql = "SELECT * FROM users WHERE user_ID = '$name' AND u_pass = '$pass'";
    $result = mysqli_query($db,$sql);
    $row = mysqli_fetch_array($result);

    //if result matched $id and $password, table row must be one row

        
        //check for type of user
    if($row["usertype"] == "student") {

        $_SESSION['userid'] == $name; //session to save id

        $_SESSION['usertype'] == "student"; //session to save type

        header("location:home.php");

    } elseif ($row["usertype"] == "instructor") {

        $_SESSION['userid'] == $name; //session to save id

        $_SESSION['usertype'] == "instructor"; //session to save type

        header("location:instructorhome.php");
    } 
    else {

        echo "ID or password do not match";

        header("location:login.php");
    }
}
?>

当我运行这个程序时，我可以告诉$_SESSION['username']工作，因为错误的用户ID或密码给我一个错误。
现在我想在正确输入后将用户从登录页面重定向到主页，所以我将此php代码放在home.php文件中的html代码之前：

<?php

session_start();

if(!isset($_SESSION['userid']))
    {
        header("location:login.php");   
    }
 elseif ($_SESSION['usertype'] == "student") 
    {
        header("location:login.php");   
    }
?>

当我尝试登录后，我使用这个php代码，它停留在登录页面.我用print_r检查，我看到$_SESSION['userid'] a是空的主页，我不知道如何解决这个问题.
I have tried including session_start(); at the top. I have gone to php.ini and I tried to change and verify everything I have seen online that people says could be causing the problem like regional globals, session.auto_inc, session.cookies, etc. I don't know what else to do.
如有任何建议，我们将不胜感激。