src/Server.php
protected function getSessionData($key)
    {
        if ($key === 'id') {
            return session_id();
        }

        return isset($_SESSION[$key]) ? $_SESSION[$key] : null;
    }
protected function getSessionData($key)
    {
        if ($key === 'id') {
            return session_id();
        }

        return isset($_SESSION[$key]) ? $_SESSION[$key] : null;
    }
protected function getSessionData ( $ key ) { if ( $ key === 'id' ) { return session_id ( ) ; } return isset ( $ _SESSION [ $ key ] ) ? $ _SESSION [ $ key ] : null ; }
Get session data

@param type $key
Get session data