$q = mysql_query("SELECT `id` FROM `users`"); while($qw = mysql_fetch_assoc($q)){ mysql_query("UPDATE `users` SET `pass`=MD5(`pass`) WHERE `id`='".$qw['id']."'"); }
$q = $db->query("SELECT `id` FROM `users`"); while($qw = $q->fetch_assoc()){ $db->query("UPDATE `users` SET `pass`=MD5(`pass`) WHERE `id`='".$qw['id']."'"); }