Gazelle/sections/inbox/massdelete_handle.php

<?
authorize();

$UserID = $LoggedUser['ID'];

if (!isset($_POST['messages']) || !is_array($_POST['messages'])) {
  error('You forgot to select messages to delete.');
  header('Location: ' . Inbox::get_inbox_link());
  die();
}

$Messages = $_POST['messages'];
foreach ($Messages AS $ConvID) {
  $ConvID = trim($ConvID);
  if (!is_number($ConvID)) {
    error(0);
  }
}
$ConvIDs = implode(',', $Messages);
$DB->query("
  SELECT COUNT(ConvID)
  FROM pm_conversations_users
  WHERE ConvID IN ($ConvIDs)
    AND UserID=$UserID");
list($MessageCount) = $DB->next_record();
if ($MessageCount != count($Messages)) {
  error(0);
}

if (isset($_POST['delete'])) {
  $DB->query("
    UPDATE pm_conversations_users
    SET
      InInbox = '0',
      InSentbox = '0',
      Sticky = '0',
      UnRead = '0'
    WHERE ConvID IN($ConvIDs)
      AND UserID = $UserID");
} elseif (isset($_POST['unread'])) {
  $DB->query("
    UPDATE pm_conversations_users
    SET Unread = '1'
    WHERE ConvID IN($ConvIDs)
    AND InInbox = '1'
    AND UserID = $UserID");
} elseif (isset($_POST['read'])) {
  $DB->query("
    UPDATE pm_conversations_users
    SET Unread = '0'
    WHERE ConvID IN($ConvIDs) AND UserID = $UserID");
}
$Cache->delete_value('inbox_new_'.$UserID);

header('Location: ' . Inbox::get_inbox_link());
?>