CODEWITHSUNDEEP
phpfacebookfacebook-graph-apifacebook-php-sdk
oshirowanen
oshirowanen

Reputation: 15925

How to log out of facebook

I have the following script which will allow a user to login to my website using their facebook account, request the appropriate permissions, and if accepted, it will post a message on a wall:

<?php
    require 'facebook.php';

    $facebook = new Facebook(array(
        'appId'  => 'removed for security reasons',
    'secret' => 'removed for security reasons',
        'cookie' => true,
    ));

    $session = $facebook->getSession();

    if ($session) {

        if (isset($_GET[id])) {
            $post = $facebook->api("/" . $_GET['id'] . "/feed", "POST",  array('message' => 'Hello!'));
            echo 'A message has been posted on your friends wall';

        } else {

            $friends = $facebook->api('/me/friends');

            foreach ($friends as $key=>$value) {
                echo 'You have ' . count($value) . ' friends<br />';

                foreach ($value as $fkey=>$fvalue) {
                    echo 'friend id = ' . $fvalue[id] . ' - friend name = ' . $fvalue[name] . ' - <a href="/stage0.php?id=' . $fvalue[id] . '">post message</a><br />';
                }
            }
        }

    } else {

        $loginUrl = $facebook->getLoginUrl(array(
            'req_perms' => 'publish_stream',
            'next' => 'http://'.$_SERVER['SERVER_NAME'].'/stage0.php',
            'cancel_url' => 'http://'.$_SERVER['SERVER_NAME'].'/cancel.php',
        ));

        header('Location: '.$loginUrl);
    }
?>

I then have the following script to log the user out:

<?php
    error_reporting( E_ALL | E_STRICT );
    ini_set('display_errors', 1);
?>

<?php
    session_start();
?>

<html>
    <head>
        <title></title>

        <?php
            $_SESSION = array(); 
            session_destroy();
        ?>

        <meta http-equiv="refresh" content="0;index.php">
    </head>

    <body>
        <h1>logout</h1>
    </body>
</html>

This clears the sessions I created, but it does not log them out of facebook at all. How do I clear the sessions I create and also log them out of facebook?

Upvotes: 0

Views: 3949

Answers (4)

Blake
Blake

Reputation: 73

Use this as your logout URL:

<a href="?action=logout">Logout</a>

And this for your code:

if(isset($_GET['action']) && $_GET['action'] === 'logout'){
    $facebook->destroySession();
}

This will log the user out of the app, rather than facebook itself, logging out of facebook altogether, which is not recommended, as it will distress some users, add this to your session where if($session) { is

$logoutUrl = $facebook->getLogoutUrl();

then for your logout URL, use:

<a href="' . $logoutUrl . '">Logout</a>

Upvotes: 0

Waqar Alamgir
Waqar Alamgir

Reputation: 9968

/* Use access token i.e. $_SESSION['facebookAccessToken']*/

function logoutUser($sessionKey)
{
    include_once 'facebook.php';
    $facebook = new Facebook( array('appId'=>FACEBOOK_APP_ID , 'secret'=>FACEBOOK_APP_SEC , 'cookie' => true));
    $logoutUrl = $facebook->getLogoutUrl(array('next' => BASE_URL , 'session_key' => $sessionKey));
    return $logoutUrl;
}

$access_array = explode('|' , $_SESSION['facebookAccessToken']);

$sessionKey = $access_array[1];

$redirectUrl = logoutUser($sessionKey);

header('Location: '.$redirectUrl );

Upvotes: 1

Jean-Christophe Meillaud
Jean-Christophe Meillaud

Reputation: 2061

Recommended way to log out a user from both your application and Facebook, is to call the logout feature of the javascript SDK.

<a href="/auth/logout" onclick="FB.logout();">logout</a>

check : http://developers.facebook.com/docs/reference/javascript/FB.logout/

Upvotes: 4

Janis Veinbergs
Janis Veinbergs

Reputation: 6988

Facebook Oauth Logout

Upvotes: -1

Related Questions