Custom validator example.

gistfile1.php

Validator::add('validShippingDate', function($value, $format, $options) {
	$validDates = array(
		date('Y-m-d', time()),
		date('Y-m-d', time() + 60*60*24),
		date('Y-m-d', time() + 2*60*60*24),
		date('Y-m-d', time() + 3*60*60*24),
		date('Y-m-d', time() + 4*60*60*24),
		date('Y-m-d', time() + 5*60*60*24),
		date('Y-m-d', time() + 6*60*60*24),
		date('Y-m-d', time() + 7*60*60*24)
	);
	
	foreach ($validDates as $index => $date) {
		if (date('N', strtotime($date) >= 6)) {
			unset($validDates[$index]);
		}
	}
	
	if (in_array(date('Y-m-d', strtotime($value)), $validDates)) {
		return true;
	}
	return false;
});