function guestbook($length=20,$limit=10,$ordertype='id') {
$_ordertype=$ordertype;
$cache_id=md5($length.$limit.$ordertype);
if ($ordertype == 'rand()')
$cache_id=$cache_id.time();
if (cache::get($cache_id))
$guestbooks=cache::get($cache_id);
else {
$ordertype=str_replace('-',' ',$ordertype);
$order='1 desc';
if (preg_match('/^\w+$/',$ordertype))
$order=$ordertype.' desc';
elseif ($ordertype)
$order=$ordertype;
$guestbook=guestbook::getInstance();
$guestbooks=$guestbook->getrows('state=1',$limit,$order,$guestbook->getcols('list'));
foreach ($guestbooks as $order=>$arc) {
$guestbooks[$order]['adddate']=sdate($arc['adddate']);
$guestbooks[$order]['title']=tool::cn_substr($arc['title'],$length);
$guestbooks[$order]['url']=url('guestbook/view/id/'.$arc['id']);
}
if ($ordertype != 'rand()')
cache::set($cache_id,$guestbooks);
}
return $guestbooks;
}
