php读取mysql分页查询

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调用例子：

$fenzhan_prize_order_db = pc_base::load_model('fenzhan_prize_order_model');

$page = max(intval($_REQUEST['page']), 1);
      $pagesize = isset($_REQUEST['pagesize']) ? $_REQUEST['pagesize'] : 10;
      $mydb =pc_base::load_model('mymodel');
      $sql = "SELECT* FROM {$fenzhan_prize_order_db->get_tablename()} wherebiaoshi='" .$this->fenzhan[biaoshi]."'order by inputtime desc";
      $mpages = $mydb->query_listinfo($sql,$page,$pagesize);

$mpages =$mydb->query_listinfo($sql,$page,$pagesize);

$msg =array();
$msg['returncode']= "0";
$msg['msg']= "文章";
$msg['comment']= $mpages;
echo JSON($msg);

分页方法：

public function query_listinfo(&$sql = '', $page = 1, $pagesize= 20, $setpages = 10,$array = array()) {
    //取得记录总数$rs，计算总页数用
    $array=$this->query_by_sql("SELECT count(1) as total FROM ( $sql) as a");
    $total=$array[0]['total'];
    //计算总页数
    $pages=intval(intval($total)/$pagesize);
    if ($total%$pagesize) {
        $pages++;
    }
    //设置页数
    if (isset($page)){
        $page=intval($page);
    }
    else{
        //设置为第一页
        $page=1;
    }1
    //计算记录偏移量
    $offset=$pagesize*($page - 1);
    //读取指定记录数
    $infos= $this->query_by_sql("$sql limit $offset,$pagesize");
    $mpages =new mpages();
    $mpages->page=$page;
    $mpages->total=$total;
    $mpages->pagesize=15;
    $mpages->data=$infos;
    return $mpages;

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