我在检查 index.php 上的用户 session 时收到此错误。用户登录后，我想在菜单中显示“注销”按钮。这是代码:
session .php
<?php
include('config.php');
session_start();
$user_check = $_SESSION['login_user'];
$ses_sql = mysqli_query($db,"select username from users where username = '$user_check' ");
$row = mysqli_fetch_array($ses_sql,MYSQLI_ASSOC);
$login_session = $row['username'];
?>
index.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<?php
include('session.php');
?>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="/css/main.css" />
<title>LVRP</title>
</head>
<body>
<div id="top-line"></div>
<div id="header">
<div class="wrapper">
<div class="logo"> </div>
</div>
</div>
<div id="menu">
<div class="wrapper">
<ul id="navigation">
<li><a class="active" href="index.php">Home</a></li>
<li><a class="inactive" href="/forum" target="_blank">Forums</a></li>
<li><a class="inactive" href="ucp.php">User Control Panel</a></li>
<?php if(isset($_SESSION['login_user'])){echo('<li><a class="inactive" href="logout.php">Log out</a></li>');} ?>
</ul>
</div>
</div>
<div id="content">
</div>
</body>
</html>
它返回注意:未定义索引:login_user in/var/www/html/session.php on line 5 on index.php
最佳答案
“它消失时只有一个空白页。”
使用启用错误
ini_set('display_errors', 'On');
在页面顶部的 PHP 标记中并发布错误。
关于PHP session 在index.php 上不存在，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36456162/