I don't understand this user defined function:
function get_or_post($var, $dfvalue = "") {
$CI = & get_instance();
$value = $dfvalue;
if (!empty($var)) {
if ($CI->input->get($var) != FALSE) {
$value = $CI->input->get($var);
} else if ($CI->input->post($var) != FALSE) {
$value = $CI->input->post($var);
}
}
return $value;
}