Form validation callback array

[eluser]LuckyFella73[/eluser]
In case you callback function handles only values of your POST array
you can access the POST values directly without passing anything.

Code:

public function compare_travel_dates()
{
$until_travel_date = $this->input->post('travel_until_date');
$earliest_date = $this->input->post('earliest_date');
$submitted_date = $this->input->post('submitted_date'); // name of your input field

// comparing code here ..
}