[insert_php]
if(!isset($_GET[‘gid’]) && !isset($_GET[‘rid’]) && (!isLoggedIn() || !isset($_GET[‘eid’]))){
echo ‘‘;
}
if(isset($_GET[‘gid’])){
$fileName = generateInvoice($_GET[‘gid’],1);
$isPaid = groupRegistrationIsPaid($_GET[‘gid’]);
}elseif(isset($_GET[‘rid’])){
$fileName = generateInvoice($_GET[‘rid’]);
$isPaid = registrationIsPaid($_GET[‘rid’]);
}elseif(isLoggedIn() && isset($_GET[‘eid’])){
$person = getPersonByPersonID($_SESSION[‘memberid’]);
$registration = getRegistrationByEvent($person->personID, $_GET[‘eid’]);
$fileName = generateInvoice($registration->registrationID);
$isPaid = registrationIsPaid($registration->registrationID);
}else{
echo ‘‘;
}
$url = “http://www.natmathematics.org/” . $fileName;
echo ‘Download ‘ . ($isPaid ? ‘Receipt’ : ‘Invoice’) . ‘‘;
echo ‘
‘;
echo ‘‘;
[/insert_php]