code: public function getUserId ()
  	{
  		$this->checkIfLoggedIn ();
  	
  		if (isset($_SESSION['is_admin']) && $_SESSION['is_admin']) {
  			// Check for $_GET
  			if (isset ($_GET['user'])) {
  				$_SESSION['admin-user-overwrite'] = $_GET['user'] > 0 ? intval ($_GET['user']) : null;
  			}
  			
  			if (isset ($_SESSION['admin-user-overwrite'])) {
  				return $_SESSION['admin-user-overwrite'];
  			}
  		}
  		
  		return $this->uid;
  	}
docs: /*
  Return the USER ID:
  This can be abused to load other peoples game
  if you are the administrator.