Php会话丢失了

Question

我执行以下操作来设置会话,这是因为回显出现.但是当我进入下一页或另一页时,会话不在那里？我究竟做错了什么？

$session_start();

if ($username==$dbusername&&$password==$dbpassword)
    {
        echo"<b>Login Successful</b><br><a href='systemadmin.html'><br>Click here to access the <strong>System Admin Page</strong></a>";
        $_session['username']=$dbusername;
        if($username == "admin")
        {
            $_session['admin'] = true;
        }

我试图让以下内容与这些会话一起工作:

<?php
session_start();
if($_session['admin'] == true)
{
// do nothing
}else{
    header( 'Location: home.html' ) ;
}

?>

更新:

大写会话工作,但现在当我使用logout.php时,会话不会破坏

<?php

session_start();

session_destroy();

header("location: home.html");

?>

Answer 1

$_session应该=> $_SESSION.

http://php.net/manual/en/reserved.variables.session.php

第一个是有效的,因为您正在设置一个"正常"变量(可用于请求).

UPDATE

要破坏会话:

<?php
// Initialize the session.
// If you are using session_name("something"), don't forget it now!
session_start();

// Unset all of the session variables.
$_SESSION = array();

// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (ini_get("session.use_cookies")) {
    $params = session_get_cookie_params();
    setcookie(session_name(), '', time() - 42000,
        $params["path"], $params["domain"],
        $params["secure"], $params["httponly"]
    );
}

// Finally, destroy the session.
session_destroy();
?>

http://php.net/manual/en/function.session-destroy.php#example-4368

另外,exit();在进行重定向后,应始终使用以防止进一步执行脚本.