/**
* 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);
}
