if ($orderItem->getIsVirtual()) {
         continue;
     }
     $item = $convertor->itemToShipmentItem($orderItem);
     $qty = $orderItem->getQtyToShip();
     $item->setQty($qty);
     $shipment->addItem($item);
 }
 $MagentoShipMethod = strtolower($myOrder->getShippingMethod());
 $MagentoShipDescription = strtolower($myOrder->getShippingDescription());
 //just returns the useless googlecheckout_carrier var
 //var_dump($myOrder->getShippingCarrier()->getCarrierCode());
 //var_dump($myOrder->getShippingCarrier());
 //find what carrier PA actually shipped with. may differ from customer-specified method
 //if tracking doesn't match a pattern we know, use the customer-specified method and log the issue.
 $carrier = find_carrier($TrackingNumber);
 if ($carrier == "") {
     $carrier = getShipCarrier($MagentoShipDescription);
     $log->lwrite("Tracking number not matched to carrier: " . $TrackingNumber);
 }
 $data = array();
 $data['carrier_code'] = $carrier;
 // translate the actual shipping method title
 $carrier_name = ucwords($MagentoShipDescription);
 switch ($carrier) {
     case "ups":
         $carrier_name = "United Parcel Service";
         break;
     case "fedex":
         $carrier_name = "Federal Express";
         break;
echo "matched: : {$matches[0]}\n";
function find_carrier($track)
{
    $ups = '/[0-9A-Z]{2} ?[0-9A-Z]{4} ?[0-9A-Z]{3} ?[0-9A-Z]{8}/i';
    $usps = '/^(EA|EC|CP|RA|CJ)[0-9]{9}[A-Z]{2}?$|^94[0-9]{20}/i';
    $fedex = '/^[0-9]{12}?$|^[0-9]{15}$/i';
    $carrier = "";
    if (preg_match($usps, $track)) {
        $carrier = "usps";
    } else {
        if (preg_match($ups, $track)) {
            $carrier = "ups";
        } else {
            if (preg_match($fedex, $track)) {
                $carrier = "fedex";
            }
        }
    }
    return $carrier;
}
echo "carrier is " . find_carrier('EC691036825US') . "\n";
//usps
echo "carrier is " . find_carrier('CJ221020023US') . "\n";
//usps
echo "little z carrier is " . find_carrier('1z7a5v061340194575') . "\n";
//ups
echo "carrier is " . find_carrier('439230031461237') . "\n";
//fedex
echo "carrier is " . find_carrier('230014970309444') . "\n";
echo "this returns empty string" . find_carrier('1234') . "see?";