会话变量不会延续到成员页面

Question

我正在尝试在登录页面中存储一个会话变量，然后将其转移到成员页面，但由于某种原因，当您转到成员页面时，会话变量没有存储。

<?php
error_reporting(E_ALL ^ E_NOTICE);
session_start();
$userid = $_SESSION['userid'];
$username = $_SESSION['username'];
?>

然后是一堆 HTML。 然后下一个 PHP 代码是...

<?php
$form = "<form action='login.php' method='post'>
<table>
<tr>
<td><input type='text' name='user' /></td>
</tr>
<tr>
<td><input type='password' name='password' /></td>
</tr>
<tr>
<td><input type='submit' name='loginbtn' value='Login' /></td>
</tr>
</table>
</form>";
if ($_POST['loginbtn']) {
$user = $_POST['user'];
$password = $_POST['password'];
if ($user) {
if ($password){
require("connect.php");
$password = md5(md5("kjfiufj".$password."GSA54"));
//make sure login info is correct
$query = mysql_query("SELECT * FROM users WHERE username='$user'");
$numrows = mysql_num_rows($query);
if ($numrows == 1) {
$row = mysql_fetch_assoc($query);
$dbid = $row['id'];
$dbuser = $row['username'];
$dbpassword = $row['password'];
$dbactive = $row['active'];
if ($password == $dbpassword) {
if ($dbactive == 1) {
//set session info
$_SESSION['userid'] = $dbid;
$_SESSION['username'] = $username;

echo "logged in as        <strong>$dbuser</strong>. <a href='member.php'>Click here</a> to go to the member page.";
}
else
echo "User not active";
}
else
echo "Wrong password.";
}
else
echo "The username you entered was not found";
mysql_close();
}
else 
echo "What's the password brah?";

}
else 
echo "What's the user name brah?";

}
else 
echo $form;
?>

会员页面的代码是

<?php
error_reporting(E_ALL ^ E_NOTICE);
session_start();
$userid = $_SESSION['userid'];
$username = $_SESSION['username'];
?>
<?php
if ($username && $userid) {
echo "Welcome <strong>$username</strong>,<a href='logout.php'>Logout</a>.";
}
else
echo "Please login to acces this page <a href='login.php'>Login here</a>";

?>

Answer 1

您是否在登录页面中调用session_start()？

如果您尚未将运行时配置选项设置为true，则必须在每个将要访问会话变量的页面中调用session_start()session.auto_start。


编辑

实际上，您的$_SESSION['userid']可能不是空的，因为您实际上是将定义的变量分配给它$_SESSION['userid'] = $dbid;

但是，您是通过将$username的值分配给它来创建$_SESSION['username']，这似乎是未定义的。

或

$_SESSION['username'] = $username;

应该是

$_SESSION['username'] = $dbuser;

Answer 2

检查变量是否确实包含某些内容

session_start();
$userid = $_SESSION['userid'];
$username = $_SESSION['username'];
?>
<?php
if (strlen($username) >0 && strlen($userid)>0) {
echo "Welcome <strong>$username</strong>,<a href='logout.php'>Logout</a>.";
}

或检查会话变量是否已设置

session_start();
$userid = $_SESSION['userid'];
$username = $_SESSION['username'];
?>
<?php
if (isset($_SESSION['username']) && isset($_SESSION['userid'])) {
echo "Welcome <strong>$username</strong>,<a href='logout.php'>Logout</a>.";
}