没有mysql的php登录

我的index.php 顶部有这段代码

<?php
include("security.php");
?>

这是 security.php

 <?php
session_start();

$user["admin"] = "123";

if (!isset($_SESSION['logged_in']))
{
    echo '<h1>Login</h1>';
    if ($_SERVER['REQUEST_METHOD'] == 'POST')
    {
        if (empty($_POST['username']) || empty($_POST['password']))
        {
            echo '<span style="color:red; font-weight: bold">Please fill in all fields!</span>';
        }
        elseif ($user[$_POST['username']] != $_POST['password'])
        {
            echo '<span style="color:red; font-weight: bold">Your username/password is wrong!</span>';
        }
        else
        {
            header("Refresh: 1");
            $_SESSION['ingelogd'] = true;
            echo '<span style="color:green; font-weight: bold">You are now logged in!</span>';
        }
    }
    else
    {
        exit('You need to log-in to view this page.<br /><br />
        <form method="POST" action=""><p>
        Username:<br />
        <input type="text" name="username" /><br /><br />
        Password:<br />
        <input type="password" name="password" /><br /><br />
        <input type="submit" value="Login" /> <input type="reset" value="Empty fields" />
        </form>');
    }
}
?>

但事实是，当我使用管理员登录并通过它登录时，但一段时间后它会将我重定向回登录页面..

请告诉我如何在登录后留在index.php..

最佳答案

检查您的以下代码:

错误: