function amazon($ids, $tag)
{
$isbns = $lookupIsbns = array();
foreach (explode(',', $ids) as $id) {
preg_match("/\\{(.+?)\\:(.+?)\\}/", $id, $matches);
if ($matches[1] == 'A') {
$isbns[] = $matches[2];
} else {
if ($matches[1] == 'MP') {
$lookupIsbns[] = $matches[2];
} else {
error_log("amazon cart called with bad input: {$ids}");
}
}
}
// find current, lowest-priced offers for the marketplace isbns
$offersArray = Amazon::getMarketplaceOffers($lookupIsbns);
$offerIds = array();
foreach ($offersArray as $offers) {
foreach ($offers->Items->Item as $item) {
// sometimes Amazon gives us different isbns than the ones we asked for
if (in_array((string) $item->ItemAttributes->EAN, $lookupIsbns)) {
$offerIds[] = (string) $item->Offers->Offer[0]->OfferListing->OfferListingId;
}
}
}
$GLOBALS['tag'] = $tag;
global $app;
$app->redirect(Amazon::getCartUrl($isbns, $offerIds), 301);
}
