這个分页显示怎么只能显示俩页，要怎么修改

<?php
/**
 * Created by PhpStorm.
 * User: Jodo
 * Date: 2017-04-17
 * Time: 16:10
 */
$currentPageIndex = 1;//当前是第几页
$pageSize = 4;//每页显示3条
$totalPage = 0;//总共有多少页
$totalRecord = 0;//总记录条数
$absoluteIndex = 0;//记录的绝对定位/**
 * 完成分页显示的相关计划与控制
 * $totalRecords 当前总的记录行数
 */
function _page($totalRecords)
{
    global  $currentPageIndex,$pageSize,$totalPage,$absoluteIndex,$totalRecord;
    if(isset($_GET['pageIndex']))
    {
        $currentPageIndex = $_GET["pageIndex"];
        if(empty($currentPageIndex) or $currentPageIndex < 0 or !is_numeric($currentPageIndex)){
            $page = 1;
        }else {
            $currentPageIndex = intval($currentPageIndex);
        }
    }else{
        $currentPageIndex = 1;
    }
    $totalPage = ceil($totalRecords / $pageSize);//ceil(5/2)=3
    $absoluteIndex = ($currentPageIndex - 1) * $pageSize;
}function _paging($pagePath)
{    global  $currentPageIndex,$pageSize,$totalPage,$absoluteIndex,$totalRecord;
/*
    echo $currentPageIndex.'<br/>';
    echo $pageSize.'<br/>';
    echo $totalPage.'<br/>';
    echo $absoluteIndex.'<br/>';
    echo $totalRecord.'<br/>';
*/    if(isset($_GET['pageIndex']))
    {
        $currentPageIndex = $_GET["pageIndex"];
        if(empty($currentPageIndex) or $currentPageIndex < 0 or !is_numeric($currentPageIndex)){
            $page = 1;
        }else {
            $currentPageIndex = intval($currentPageIndex);
        }
    }else{
        $currentPageIndex = 1;
    }    //判断可点击状态
    if($currentPageIndex >= $totalPage)
    {
        //说明，到了最后一页：下一页，末页不可点击
        $currentPageIndex = $totalPage;
        echo "<div style='margin:0 auto; width:400px; height:25px; border:0px solid #F00'>$currentPageIndex/$totalPage &nbsp;|&nbsp;共有".$totalPage."条&nbsp;|&nbsp;<a href='$pagePath". "?pageIndex=1"."'>首页</a>&nbsp;|&nbsp;<a href='$pagePath"."?pageIndex=".($currentPageIndex - 1)."'>上一页</a>&nbsp;|&nbsp;<a>下-页</a>&nbsp;|&nbsp;<a>末页</a></div>";
    }elseif($currentPageIndex <= 1)
    {
        //说明，到了首页：上一页，首页不可点击
        $currentPageIndex = 1;
        echo "<div style='margin:0 auto; width:400px; height:25px; border:0px solid #F00'>$currentPageIndex/$totalPage &nbsp;|&nbsp;共有".$totalPage."条&nbsp;|&nbsp;<a>首页</a>&nbsp;|&nbsp;<a>上一页</a>&nbsp;|&nbsp;<a href='$pagePath"."?pageIndex=".($currentPageIndex + 1)."'>下-页</a>&nbsp;|&nbsp;<a href='$pagePath"."?pageIndex=$totalPage"."'>末页</a></div>";
    }else{
        echo "错误";
    }
    //echo "<div style='margin:0 auto; width:400px; height:25px; border:0px solid #F00'>$currentPageIndex/$totalPage &nbsp;|&nbsp;共有12页&nbsp;|&nbsp;<a href='$pagePath". "?pageIndex=1"."'>首页</a>&nbsp;|&nbsp;<a href='$pagePath"."?pageIndex=".($currentPageIndex - 1)."'>上一页</a>&nbsp;|&nbsp;<a href='$pagePath"."?pageIndex=".($currentPageIndex + 1)."'>下-页</a>&nbsp;|&nbsp;<a href='$pagePath"."?pageIndex=$totalPage"."'>末页</a></div>";
}