/**
  * Get current user
  * Get currently loggedin user
  *
  * @return User_API|FALSE Returns currently logged in user object if any, FALSE if current user have not logged in
  */
 public static final function userGetCurrent()
 {
     if (!self::$_userCacheObject instanceof Users_API) {
         $userStack = self::$_userStack;
         if (empty($userStack)) {
             return false;
         }
         $userID = array_pop($userStack);
         $currentUser = new User_API($userID);
         if ($currentUser->userid != $userID) {
             return false;
         }
         self::$_userCacheObject = $currentUser;
     }
     return self::$_userCacheObject;
 }