Logout Code

what code shall i write to logout from the site??? i have a website where i allow the users to access the webpages once they have login.

i want the users to logout on click of a logout hyperlink. if user tries to click on the back button of the browser after logging out it should display session expired.

i have written the code as
in all the pages after login

and on click of logout hyperlink the logout.php page opens where the code written is

if (isset($_COOKIE[session_name()])) {
setcookie(session_name(), '', time()-42000, '/');
header("Location: index.php");


Logout Code Not Executing At All?

Here is the codeI dont know whats wrong with it.

//Logout code
//Starting Session


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So basically, if you are logged out, login/register will show. If you are logged in, logout with show.

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i'm using this code: but doesnt seem to work because the structure of my html file has 3 frames, a sidebar, title, and the main.

Now, the user will have two buttons, the call new sidebar. Which is only accessible if he has logged in. And the other button is log out. When the user press the call new sidebar. The sidebar will change into a user-only sidebar. Now, when the user clicks the logout button the sidebar which is only for users is still there. Is it possible to target two frames in html. Any other technique that you can recommend so that when the user logs off. There will be no other way to access the user-only sidebar.


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I started using codeigniter for my project. I have user authentication system for my website. I have seen the videos from nettuts for the login information. I am confused why the logout is not working properly. I have the following logout function in my login controller.

function logout() {

If I click on the logout button I am redirecting the user to the main page. But after redirecting the user to the main page, if click on the back button on the browser I will see the logoff and my name on the top of the page. I need some help on where I am going wrong or is there any important piece of code I am missing in my controller I think I found the solution. I should append the following code into the appropriate controller

$this->output->set_header("Cache-Control: no-store, no-cache, must-revalidate, no-transform, max-age=0, post-check=0, pre-check=0");
$this->output->set_header("Pragma: no-cache");

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For some reason I am able to run my login script which after doing so will put more options into my menu to allow me to do other things. Well one option it brings up of course is "logout". Well for some reason it doesnt logout. I dont know if you will need more info but this is my log out script, I cant seem to see where the issue is. Code:

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I've written a login/logout code. It does what it's supposed to do but
the problem is when I logout and press browser's back button (in
Firefox), I get to the last login page. In IE, when I press back
button, I get to the page that says "Page has Expired" but Firefox does
not do this.

I think it's something to do with sessions not properly unset or
something like that but I haven't been able to figure it out. I am
attaching my codes and database structure below. If you need more info,
please email me. I really want this to be fixed asap. I've played with
this long enough.


class Login {
//var $loginflag;
//var $db_connect;

function Login() {
//$this ->db_connect = $db_connect;

if (!isset($_SESSION['uid']) || $_SESSION['uid'] == 0) {
echo "inside login class<br />";

function check_login($username, $password) {
global $db;

if ($_SESSION['logged']) {
echo "logged...<br />";
return true;
} else {
$username = mysql_escape_string($username);
$query = "SELECT * FROM users WHERE username = '$username' AND
AES_DECRYPT(password, 'dreamfilmslogin438ismbtsx') = '$password'";
$result = mysql_query($query, $link) or die("Could not select");

if (mysql_num_rows($result)) {
$this->set_session($username = mysql_fetch_assoc($result), true);
return $username['username'];
} else {
$this->failed = true;
return false;

function check_session() {
global $db;

$username = mysql_escape_string($_SESSION['username']);
$token = mysql_escape_string($_SESSION['token']);
$session = mysql_escape_string(session_id());
$ip = mysql_escape_string($_SERVER['REMOTE_ADDR']);

$query = "SELECT * FROM users WHERE username='{$username}' AND
token='{$token}' AND session='{$session}' AND ip='{$ip}'";
$result = mysql_query($query, $link) or die("Could not select");
echo "check session:<br />";
echo "<br />";
if ($result != false) {
} else {

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How I can introduce in this line:

<span class="destqwhit">
<a href="alt_pass.php">Alterar Password</a> |
<a href="index.php?"> Logout</a>

the next PHP function for logout

if($_POST["logout"] != "")
echo "<meta http-equiv="refresh" content="0;URL=index.php">";

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for example,
----- logout script ------

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include_once ('includes/header.html');

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if (!isset($_SESSION['member'])) {

    header ("Location: index.php");
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