<?php
/* This macro will be parsed as PHP code (see http://www.php.net)

The calculateshipping function is called every time a shipping calculation request is made by Shopify.

The function must return an array of available shipping options, otherwise no shipping options will be returned to your customers.
*/
function calculateshipping($DATA) {

	/* do not edit above this line */

	$_RATES = array();

	//flat rate for SKUs
	$fixedPriceItems = array(
		'SKU000001' => array('first'=>1000, 'sub'=>400),
		'SKU000002' => array('first'=>1000, 'sub'=>500),
	);

	$rate = 0;
	foreach ($DATA['items'] as $item) {
		if (isset($fixedPriceItems[$item['sku']])) {
			$itemRate = $fixedPriceItems[$item['sku']];
			
			if ($item['quantity'] > 1) {
				$rate += $itemRate['first'] + $itemRate['sub']*($item['quantity']-1);
			} else {
				$rate += $itemRate['first'];
			}
		} else {
			return array();
		}		
	}

	//round up nearest cent
	$rate = ceil($rate);

	$_RATES[] = array(
		"service_name" => "Standard Shipping",
		"service_code" => "STANDARD",
		"total_price" => $rate, //in cents
		"currency" => "USD",
	);

	return $_RATES;

	/* do not edit below this line */

}