用array_slice实现分页

<?php
header("Content-type:text/html;charset=utf-8");
$mysqli = new mysqli("127.0.0.1","root","0417","drill");
$mysqli -> query("set names utf8");
$sql = "select * from page";
$res = $mysqli -> query($sql);
while($rows = $res->fetch_assoc())
{
	$data[] = $rows;
}
//当前页面
$pages=1;
$num = count($data);
//设置每页显示的条数
$number = 2;
//设置总页数
$pagesize = ceil($num/$number);
//设置偏移量
 $start = ($pages-1)*$number; 
//$data  总数组
//$start  取出元素开始出
//$number  取出多少条
//ture  保留键名
 $newpage = array_slice($data,$start,$number,true); 
// print_r($newpage);exit; 
?>