facebook session gets destroyed frequently in my application?

Question

After I login in my application using facebook sdk I am getting the facebook user id but after some time it automatically gets destroyed . This is happening frequently . I need to refresh the page every now and then . Can anyone help me to find the solution why this is happening ? I am using both javascript and php sdk . I have searched for the same but i have not got any proper solution .

Plz someone help me with this...

Here is the code I am using to login :

<div id="fb-root"></div>
        <script>
            window.fbAsyncInit = function() {
                FB.init({
                    appId: '<?php echo $facebook->getAppID() ?>',
                    cookie: true,
                    xfbml: true,
                    oauth: true
                });
                FB.Event.subscribe('auth.login', function(response) {
                    window.location.reload();
                });
                FB.Event.subscribe('auth.logout', function(response) {
                    window.location.reload();
                });
            };
            (function() {
                var e = document.createElement('script');
                e.async = true;
                e.src = document.location.protocol +
                        '//connect.facebook.net/en_US/all.js';
                document.getElementById('fb-root').appendChild(e);
            }());
            function loginfb()
            {
                FB.login(function(response) {
                    if (response.authResponse) {
                        //alert('Success!');
                    } else {
                        //alert('Login Failed!');
                    }
                }, {scope: 'manage_pages,publish_actions,email'});
            }
            (function(d, s, id) {
                var js, fjs = d.getElementsByTagName(s)[0];
                if (d.getElementById(id))
                    return;
                js = d.createElement(s);
                js.id = id;
                js.src = "//connect.facebook.net/en_US/all.js#xfbml=1&appId=<?php echo APP_ID_KEY; ?>";
                fjs.parentNode.insertBefore(js, fjs);
            }(document, 'script', 'facebook-jssdk'));

and here is the php code which i am using to get the facebook user id :

require_once('facebook.php');


$facebook = new Facebook(array(
  'appId'  => APP_ID_KEY,
  'secret' => APP_SECRET,
));

$site_url = CALLBACK_URL;
// Get User ID

$user = $facebook->getUser();


if ($user) {
  try {

        // Proceed knowing you have a logged in user who's authenticated.
        $user_profile = $facebook->api('/me');
        $friends = $facebook->api('/me/friends');

    $token=$facebook->getAccessToken();

  } catch (FacebookApiException $e) {
    error_log($e);`enter code her`enter code here`e`
    $user = null;
  }
}

Now when I login for the first time I am getting the facebook user id but after some time automatically it becomes zero so i need to click on login button again to get the user id this is happening very frequently and its very annoying..

Answer 1

1. Session garbage collector can delete session file if is not modified
2. Probably you are using short life access token so when you call FB api you receive exception where FB session is cleared
3. I had problem with using JS and PHP SDK on site, PHP was interpreting JS cookie (shared session == false, in JS auth you are receiving short life access token) and i resolved it by diseabling cookie in JS init.

PS check what Facebook exception is saying

Answer 2

This is JS side

window.fbAsyncInit = function() {
    FB.init({
    appId      : app_id, 
    status     : true,
    });         
};
(function(d){
var js, id = 'facebook-jssdk'; if (d.getElementById(id)) {return;}
js = d.createElement('script'); js.id = id; js.async = true;
js.src = "//connect.facebook.net/pl_PL/all.js";
d.getElementsByTagName('head')[0].appendChild(js);
}(document));


//callback - function called after succeed login 
//opts - The same opts as in FB.login().
function login(callback, opts)
{
    //opts must be an object
    if (!opts || typeof(opts) !== "object") {
        opts = null;
    }

    FB.getLoginStatus(function(statusResponse) { //check login status
        if(statusResponse.status === 'connected') { //user logged in
            if(opts !== null && opts.scope !== null) {
                //if there is scope opt check that user grant access to all permissions
                FB.api('/me/permissions?fields='+opts.scope, 'get', {access_token : statusResponse.authResponse.accessToken }, function(response) { 
                    var perms = opts.scope.split(',');
                    for(var i=0;i<perms.length;i++) {
                        if(response.data[0][perms[i]] !== 1) {
                            //one of permissions fails - do login and break loop
                            FB.login(function(loginResponse) {
                                if(loginResponse.status === 'connected')
                                    proceedLogin(loginResponse.authResponse,callback); //ajax call
                            }, opts);
                            return;
                        }
                    }

                    //every perm is granted, great so let's proceed user login
                    proceedLogin(statusResponse.authResponse,callback);//ajax call
                });
            } else {
                //there's no opts or no perms to check
                proceedLogin(statusResponse.authResponse,callback);//ajax call
            }
        } else { //user not logged in :(
            FB.login(function(loginResponse) {
                if(loginResponse.status === 'connected')
                    proceedLogin(loginResponse.authResponse,callback);//ajax call
            }, opts);
        }

    });
}
function proceedLogin(authResponse,callback) {
    $.post('/ajax/login', authResponse, function(data) {
        if (data.user && callback && typeof(callback) === "function") {
            callback();
        }   
    });
}

and this is PHP side

function login() {
    //FB() your facebook instance
    FB()->setAccessToken( $_POST['accessToken'] ); //set access token from JS
    FB()->setAccessToken( FB()->setExtendedAccessToken() );
    $user = FB()->getUser();

    echo json_encode(array( 'user' => $user ));

}