Groups nested hour registration data & sums up the total overage in 2011 per customer

Who_needs_foreach_anyway.php

<?php
// Thank you CakePHP Set::combine() & PHP5.3 : )
// http://book.cakephp.org/view/1492/combine
$cust_overage = array_map(function ($regs) {
    return array_sum($regs);
}, Set::combine(
    $this->Hour->overage(2011),
    '/Hour/id',
    '/Hour/amount',
    '/Hour/customer_id'
));