$this->input->post($data, TRUE) vs ...xss_clean($data)

[eluser]veledrom[/eluser]
Hi,

I just wonder if there is any difference between codes below because, if them two do the same work then there is no point for me to use both at same time. Am I right?

Thanks

Code:

$this->input->post($data, TRUE);

Code:

$this->security->xss_clean($data);