is_unique for codeigniter form validation

Question

I\'m trying to figure out how I can use the is_unique rule from the Codeigniter form validation library in the following situation.

I\'m trying to submi

Answer 1

$something = $this->input->post('something');

$this->form->validation->set_rules('something','Something','xss_clean|is_unique['tbl'.users]');

if($this->form_validation->run()== FALSE){

}