/** * Delete authentication key. * * @param string $key * @return null */ protected function delete_auth_key($key) { $config_name = 'titania_key_' . $key; $sql = 'DELETE FROM ' . $this->table_prefix . 'config WHERE config_name = "' . $this->db->sql_escape($config_name) . '"'; $this->db->sql_query($sql); }