Logout code not working.

[5to10pm]

I modified my php.ini to set session domain

PHP Code:

session.cookie_domain='.maindomain.com' 


In VB, I changed cookie domain to .maindomain.com. And implemented single sign on on external page using this code. Using latest vBulletin i.e. 5.3.0
I also want to implement auto logout feature. So here is the code that I wrote:

PHP Code:

// Path to your vBulletin installation 
$vbpath = 'D:/XAMPP/htdocs/forum.maindomain.com/'; 

// Start login script 
define('CSRF_PROTECTION', false); 
require_once($vbpath . '/includes/vb5/autoloader.php'); 
vB5_Autoloader::register($vbpath); 
vB5_Frontend_Application::init('config.php'); 

////logout 
$api = Api_InterfaceAbstract::instance(); 
$userid=false; 
$userInfo = $api->callApi('user', 'fetchProfileInfo', array($userid)); //need logouthash, so calling fetchprofileinfo
if(!empty($userInfo)){ 
//echo $userInfo['logouthash'].'<br>'; 
$x=$api->callApi('user', 'logout', array($userInfo['logouthash'])); 
var_dump($x); ///output: array(2) { ["sessionhash"]=> string(32) "7539b3b1778217bd012ef1dce83019b6" ["apiaccesstoken"]=> NULL } 
} 


But the above code is not working. somebody, please provide working external logout script.

Thank you in advance

--------------- Added [DATE]1492219558[/DATE] at [TIME]1492219558[/TIME] ---------------

I don't know why, but deleting the cookies after calling the logout did the trick

PHP Code:

setcookie("bbsessionhash", "", -1, '/', ".maindomain.com");
setcookie("bblastvisit", "", -1, '/', ".maindomain.com");
setcookie("bblastactivity", "", -1, '/', ".maindomain.com");
setcookie("bbpassword", "", -1, '/', ".maindomain.com");
setcookie("bbuserid", "", -1, '/', ".maindomain.com");