$shipmentID = findExtract($response,"open_label_popup_", "()");
$labelURL = "https://www.paypal.com/ca/cgi-bin/webscr?cmd=_ship-usps-label&shipment_id=".$shipmentID;

function findExtract($longString, $startString, $endString){

		$start = strpos($longString, $startString) + strlen($startString);
		//echo $start;
		if ($start < strlen($startString) + 1){
		return false;
		}
		$end = strpos($longString, $endString, $start);
		$string = substr($longString, $start, $end - $start);

		//echo $string;
		return $string;


	}