适应中文的substr函数

function SubstrGB($in,$num){
        $pos=0;
        $out="";
        while($c=substr($in,$pos,1)){
            if($c=="n") break;
            if(ord($c)>128){
                $out.=$c;
                $pos++;
                $c=substr($in,$pos,1);
                $out.=$c;
            }
            else{
                $out.=$c;
            }
            $pos++;
            if($pos>=$num) break;
        }
        return $out;
    }  php爱好　者站 http://www.ｐｈｐｆａｎｓ.net php基础|php进阶|php模板.