function free_seats($angebot_id)
{
$angebot = fetch_one_ride($angebot_id);
$anzahl = $angebot['anzahl'];
return $anzahl - count_mitfahrer($angebot_id);
}
$angebot_id = $_POST['angebot_id'];
$mf_name = $_POST['name'];
$mf_tel = $_POST['tel'];
$mf_email = $_POST['email'];
$freie_plaetze = free_seats($angebot_id);
if ($freie_plaetze > 0) {
add_mitfahrer($angebot_id, $mf_name, $mf_tel, $mf_email);
$mf_id = find_mitfahrer($angebot_id, $mf_email);
if ($mf_id == 0) {
//problem with database, return 2
echo 2;
} else {
//everything is ok return 0
echo 0;
//everyone involved should get an email
$angebot = fetch_one_ride($angebot_id);
$f_name = $angebot['name'];
$f_tel = $angebot['tel'];
$f_email = $angebot['email'];
$von = $angebot['von'];
$nach = $angebot['nach'];
$datum = show_date($angebot['time']);
$zeit = show_time($angebot['time']);
$treffpunkt = $angebot['treffpunkt'];
$dtstart = make_dtcomponent($angebot['time']);
$dtend = make_dtcomponent($angebot['time'] + 30 * 60);
//duration 30 minutes
$ics = make_ics($dtstart, $dtend, $treffpunkt, $von, $nach);
$mitfahrer_msg = make_mitfahrer_message($mf_name, $von, $nach, $datum, $zeit, $f_name, $f_tel, $f_email);
$subject = "Mitfahrgelegenheit ({$von} -> {$nach}) am {$datum}, {$zeit}";
$from = "*****@*****.**";
