我正在使用 PHP 4.3.9, Apache/2.0.52
我正在尝试创建一个登录系统，将DB值注册到会话中，在登录后它们可用。 但是，一旦被重定向后，我会失去会话变量。
我在我的登录表单页面和重定向的页面上使用以下代码来打印会话ID/值：
echo '<font color="red">session id:</font> ' . session_id() . '<br>';
echo '<font color="red">session first name:</font> ' . $_SESSION['first_name'] . '<br>';
echo '<font color="red">session user id:</font> ' . $_SESSION['user_id'] . '<br>';
echo '<font color="red">session user level:</font> ' . $_SESSION['user_level'] . '<br><br>';
这是我登录页面中打印出的内容（我只是注释掉了重定向到已登录页面的标题）。这也是来自我的数据库的正确信息，所以目前一切正常。
session id: 1ce7ca8e7102b6fa4cf5b61722aecfbc
session first name: elvis
session user id: 2
session user level: 1
这是我重定向/登录页面上打印的内容（当我取消header/redirect的注释时）。会话ID相同，但我没有获取到任何单个会话变量的值。
session id: 1ce7ca8e7102b6fa4cf5b61722aecfbc
session first name:
session user id:
session user level:
我收到以下错误信息：
未定义的索引：first_name 未定义的索引：user_id 未定义的索引：user_level
我有一个全局的 header.php 文件，我的 loggedIN.php 没有调用它，但 loggedOUT.php 调用了它 - 以销毁会话：
header.php
<?php
ob_start();
session_start();
//if NOT on loggedout.php, check for cookie. if exists, they haven't explicity logged out so take user to loggedin.php
if (!strpos($_SERVER['PHP_SELF'], 'loggedout.php')) {
/*if (isset($_COOKIE['access'])) {
header('Location: www.mydomain.com/loggedin.php');
}*/
} else {
//if on loggedout.php delete cookie
//setcookie('access', '', time()-3600);
//destroy session
$_SESSION = array();
session_destroy();
setcookie(session_name(), '', time()-3600);
}
//defines constants and sets up custom error handler
require_once('config.php');
?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
some page layout stuff
Login portion is eventually called via include
footer stuff
我的loggedIN.php仅仅是启动会话而已。
<?php
session_start();
?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
我的登录脚本的逻辑，其中关键部分是我将DB结果直接获取到$_SESSION中（在下半部分）：
if (isset($_POST['login'])) {
//access db
require_once(MYSQL);
//initialize an errors array for non-filled out form fields
$errors = array();
//setup $_POST aliases, clean for db and trim any whitespace
$email = mysql_real_escape_string(trim($_POST['email']), $dbc);
$pass = mysql_real_escape_string(trim($_POST['pass']), $dbc);
if (empty($email)) {
$errors[] = 'Please enter your e-mail address.';
}
if (empty($pass)) {
$errors[] = 'Please enter your password.';
}
//if all fields filled out and everything is OK
if (empty($errors)) {
//check db for a match
$query = "SELECT user_id, first_name, user_level
FROM the rest of my sql here, blah blah blah";
$result = @mysql_query($query, $dbc)
OR trigger_error("Query: $query\n<br />MySQL Error: " . mysql_error($dbc));
if (@mysql_num_rows($result) == 1) { //a match was made, OK to login
//register the retrieved values into $_SESSION
$_SESSION = mysql_fetch_array($result);
mysql_free_result($result);
mysql_close($dbc);
/*
setcookie('access'); //if "remember me" not checked, session cookie, expires when browser closes
//in FF you must close the tab before quitting/relaunching, otherwise cookie persists
//"remember me" checked?
if(isset($_POST['remember'])){ //expire in 1 hour (3600 = 60 seconds * 60 minutes)
setcookie('access', md5(uniqid(rand())), time()+60); //EXPIRES IN ONE MINUTE FOR TESTING
}
*/
echo '<font color="red">cookie:</font> ' . print_r($_COOKIE) . '<br><br>';
echo '<font color="red">session id:</font> ' . session_id() . '<br>';
echo '<font color="red">session first name:</font> ' . $_SESSION['first_name'] . '<br>';
echo '<font color="red">session user id:</font> ' . $_SESSION['user_id'] . '<br>';
echo '<font color="red">session user level:</font> ' . $_SESSION['user_level'] . '<br><br>';
ob_end_clean();
session_write_close();
$url = BASE_URL . 'loggedin_test2.php';
header("Location: $url");
exit();
} else {
//wrong username/password combo
echo '<div id="errors"><span>Either the e-mail address or password entered is incorrect or you have not activated your account. Please try again.</span></div>';
}
//clear $_POST so the form isn't sticky
$_POST = array();
} else {
//report the errors
echo '<div id="errors"><span>The following error(s) occurred:</span>';
echo '<ul>';
foreach($errors as $error) {
echo "<li>$error</li>";
}
echo '</ul></div>';
}
} // end isset($_POST['login'])
如果我在登录页面注释掉头部重定向，我可以使用来自数据库的正确信息回显$_SESSION变量。但是一旦重定向到登录页面，它们就消失/未设置。有人有任何想法吗？我已经花了一整天的时间，但似乎离解决问题更远了。顺便说一下，我最近制作了两个简单的测试页面，一个开始会话，设置了一些变量，有一个表单提交，重定向到第二个页面，仅读取/输出会话变量。这一切似乎都很正常，只是我在主应用程序中遇到了一些问题。