php+mysql数据分页显示

//创建连接
$mysqli=new mysqli('localhost','root','','message');
if(mysqli_connect_errno())
{
    print('连接失败\n');
    exit();
}
$mysqli->query("set names 'utf8'");//编码强制转换，否则中文显示乱码
//获取当前页数
if(isset($_GET['page']))
{
    $page=intval($_GET['page']);
}
else
{
    $page=1;
}
//每页数量
$page_size=3;
//获取总数据量
$result=$mysqli->query("select count(*) as amount from user");
list($amount)=$result->fetch_row();
//计算总共有多少页
if($amount)
{
    if($amount<$page_size)
    {
        $page_count=1;
    }
    else if($amount%$page_size)//有余数
    {
        $page_count=(int)($amount/$page_size)+1;
    }
    else
    {
        $page_count=$amount/$page_size;
    }
}
else
{
    $page_count=0;
}
$str="select userId,usrname,password,createAt from user order by userId limit ".($page-1)*$page_size.",".$page_size;
$result=$mysqli->query($str);
while(list($userId,$usrname,$password,$createAt)=$result->fetch_row())
{
    echo "编号：".$userId."   名称:".$usrname."  密码：".$password."  时间：".$createAt."
";
}
$result->close();
$mysqli->close();
//翻页连接
$page_string='';
if($page==1)
{
    $page_string.='第一页|上一页|';
 }
else{
    $page_string.='第一页|.($page-1). '>上一页|';
}
if(($page==$page_count)||($page_count==0))
{
    $page_string.='下一页|尾页';
}
else
{
    $page_string.='.($page+1).'>下一页|.$page_count.'>尾页';
}
echo "共".$amount."条数据";
echo $page_string;
?>