num_rows

<?php
$dbr = mysql_query("SELECT id FROM messages WHERE read=0 AND inbox=1 AND to='".$data['login']."'");
$new = mysql_num_rows($db);
?>

<?php
$dbr = mysql_query("SELECT id FROM messages WHERE read=0 AND inbox=1 AND to='".$data['login']."'");
$new = mysql_num_rows($db);
?>

<?php
$dbres = mysql_query("SELECT `id` FROM `messages` WHERE `read`=0 AND `inbox`=1 AND `to`='".$data['login']."'");
?>

<?php
$dbres = mysql_query("SELECT `id` FROM `messages` WHERE `read`=0 AND `inbox`=1 AND `to`='".$data['login']."'");
?>