web开发怎么实现帖子自动换页？还有让内容怎么只显示在一个区域

$curpage = isset($_GET['curpage'])? $_GET['curpage'] : 1;
$total = 1000;
$pagesize = 20;
$url = 'page.php';
$show = 10;

echo page($curpage, $pagesize, $total, $url, $show);

function page($curpage, $pagesize, $total, $url, $show){

    if($total------解决方案--------------------
 $curpage------解决方案--------------------
 $pagesize------解决方案--------------------
 $show        return '';
    }

    $pagecount = (int)(($total-1)/$pagesize)+1;

    if($curpage>$pagecount){
        $curpage = $pagecount;
    }

    $tmp = '';
    $step = (int)($show/2);

    if($curpage-$step        $start = 1;
        $end = $pagecount>$show? $show : $pagecount;
    }elseif($curpage+$step>=$pagecount){
        $start = $pagecount-$show+1;
        $end = $pagecount;
    }else{
        $start = $curpage-$step;
        $end = $start+$show-1;
    }

    if($curpage>1){
        $tmp .= '上一页';
    }

    for($i=$start; $i        if($i==$curpage){
            $tmp .= ''.$i.'';
        }else{
            $tmp .= ''.$i.'';
        }
    }

    if($curpage        $tmp .= '下一页';
    }

    $tmp .= '总数:'.$total.'，共'.$pagecount.'页';

    return $tmp;
}
?>