function ReplaceKey($newstext,$classid=0)

//替换关键字
function ReplaceKey($newstext,$classid=0){
    global $empire,$dbtbpre,$public_r,$class_r;
    if(empty($newstext)||$class_r[$classid]['keycid']==-1)
    {return $newstext;}
    $where='';
    if(!empty($class_r[$classid]['keycid']))
    {
        $where=" where cid='".$class_r[$classid]['keycid']."'";
    }
    $newstext=stripslashes($newstext);
    preg_match_all('/<a[^>](.*)a>|<img[^>](.*)>/isU',stripslashes($newstext),$rs);
   
    if($rs[0]){
        foreach($rs[0] as $k=>$v){
            $newstext=str_replace($v,"[!--{$k}--]",$newstext); 
        }
    }
    $sql=$empire->query("select keyname,keyurl from {$dbtbpre}enewskey".$where);
    while($r=$empire->fetch($sql))
    {
        if(STR_IREPLACE)
        {
            $newstext=empty($public_r[repkeynum])?str_ireplace($r[keyname],'<a href='.$r[keyurl].' target=_blank class=infotextkey>'.$r[keyname].'</a>',$newstext):preg_replace('/'.$r[keyname].'/i','<a href='.$r[keyurl].' target=_blank class=infotextkey>'.$r[keyname].'</a>',$newstext,$public_r[repkeynum]);
        }
        else
        {
            $newstext=empty($public_r[repkeynum])?str_replace($r[keyname],'<a href='.$r[keyurl].' target=_blank class=infotextkey>'.$r[keyname].'</a>',$newstext):preg_replace('/'.$r[keyname].'/i','<a href='.$r[keyurl].' target=_blank class=infotextkey>'.$r[keyname].'</a>',$newstext,$public_r[repkeynum]);
        }
    }
    if($rs[0]){
        foreach($rs[0] as $k=>$v){
            $newstext=str_replace("[!--{$k}--]",$v,$newstext); 
        }
    }
    return $newstext;
}