PHP Scrit in C.I Method - Convertion

Give all your inputs names, including the submit button. You can use the name "submit".
Your controller should load the form view only if "submit" wasn't posted.

The common logic for a function like that is:

PHP Code:

if (! $this->input->post('submit')) {
  //show the form
}
else {
  //show the view with results
} 


In a later version, you can add form_validation.

The line

PHP Code:

if ($Form_data['form_fields'] == "N" ) 


doesn't make sense, because $form_data['form_fields'] is an array with all post values.
To determine if $sorte == "N", do this:

PHP Code:

if ( $this->input->post('sorte') == 'N') {
  ...
}