Nachricht nur an bestimmte Personen senden

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if($action=="order") {
if(isset($_POST['send'])) {
$db->query("UPDATE bb".$n."_order_config SET fortschritt = '".intval($fortschritt)."' WHERE userid = '$wbbuserdata[userid]'");

$userid_sender ="1";
$userid_account_eins = "2";
$betreff = "Wichtige Information!";
$nachricht = "...";
$db->query("INSERT INTO bb".$n."_privatemessage  (senderid,recipientid,subject,message,sendtime,showsmilies,showsignature,iconid,view,reply,forward,deletepm,tracking) VALUES ('".$userid_sender."','".$userid_account_eins."','$betreff','$nachricht','".time()."','1','1','3','$view','$reply','$forward',',
2','1')");

header("Location: order.php?&sid=$session[hash]")or die(mysql_error());
exit();
}