$sql_extra = ($parenturi != "" ? " AND `parent-uri` = '" . dbesc($parenturi) . "'" : "");
// get data of the specified message id
$r = q("SELECT `id` FROM `mail` WHERE `uid` = %d AND `id` = %d" . $sql_extra,
$sql_extra = ($parenturi != "" ? " AND `parent-uri` = '" . dbesc($parenturi) . "'" : "");
// get data of the specified message id
$r = q("SELECT `id` FROM `mail` WHERE `uid` = %d AND `id` = %d" . $sql_extra,