php分页方法

    $page_on=15;//定义每页显示数
    $pageNum=$_GET['pageNum'];  //当前页数
    $result = mysql_query("SELECT * FROM news");
    $num=mysql_num_rows($result);
    $page=ceil($num/$page_on);  //总页数
    if($pageNum==0){
        $pageNum=1; //当前页数为1
    }
    if($pageNum>$page){
        $pageNum=$page; //当前页数为最大页数
    }
    //显示当前页面的内容
    $sql="select * from news N left join sys_users S on N.news_sys_userid=S.sys_id      order by news_time desc limit ".($pageNum-1)*$page_on.",".$page_on;

    $res=mysql_query($sql);
    $data=array();
    while($row=mysql_fetch_array($res)){
        $row['news_content']=mb_substr($row['news_content'],0,80);
        $row['news_time']=date('Y-m-d H:i:s',$row['news_time']);
        $data['list'][]=$row;

    }
    $total=$num; //总条数
    $page=$page; //总页数
    $current_page=$pageNum; //当前页数