logging all user actions

Hello just use a model that autoload, and have the function to set the logs, something like this:

On Logs_Model:

public function set_log($action = FALSE, $extra = $FALSE)
{

$diccionario = array (

1 => 'has loged in',
2 => 'has loged out'
3 => 'created'. $extra[0]. " " .$extra[1],
);

$datestring = '%Y-%m-%d %h-%i-%s %a';

$log = array (
'logs_date' => mdate($datestring, time()),
'logs_user'=>$this>session>userdata('username'),
'logs_event' => $diccionario[$action],
);

$this->db->insert('logs', $log);
}

Supouse you will create an user, in your controller:

...

$this->user_model->insert();

$extra = array(
'the user',
$this->input->post('username'),
);

$this->logs_model->set_log(3, $extra);