CI_Session::get_flash_keys PHP Method

    public function get_flash_keys()
    {
        if (!isset($_SESSION['__ci_vars'])) {
            return array();
        }
        $keys = array();
        foreach (array_keys($_SESSION['__ci_vars']) as $key) {
            is_int($_SESSION['__ci_vars'][$key]) or $keys[] = $key;
        }
        return $keys;
    }