帝国CMS插件 帝国自定义函数之随机获取10条信息id

function jhc_get_keyid($tbname,$limit=10){

    global $empire,$dbtbpre;

    $maxid=$empire->gettotal("select max(id) as total from {$dbtbpre}ecms_{$tbname} ");

    $ids=array();

    $i=0;     

    while($i<$limit){

            $key=rand(1,$maxid);

            $key=$empire->gettotal("select id as total from {$dbtbpre}ecms_{$tbname} where id<=$key order by id desc limit 1 ");

            if(in_array($key,$ids))continue;

            $ids[]=$key;

            $i++;

    }

    $rand=implode(',',$ids);   

    return $rand;

}