PHP 原生分页

//总条数
            $sum_page = count($dat);
            //每页条数
            $num_page = 4;
            //总页数
            $page_sum = ceil($sum_page/$num_page);
            //当前页
            $page=isset($_GET['page'])?intval($_GET['page']):1;
            //偏移量
            $limit  = $num_page*($page-1);
            //查询
            $arr['list'] = array_slice($dat,$limit,$num_page);
            $arr['search'] = $search;
            $arr['num'] = $page_sum;
            $arr['hos'] = $hos;
            $this->load->view('index.php',$arr);
//表单页面
<?php 
        for($i=1;$i<=$num;$i++){
            echo "<a href='".site_url('welcome/index?page=').$i.'&search='.$search."'>".$i."</a>";
        }
    ?>