PHP 分页代码

我给你一个类吧，很简单的，
<?php
//分页函数
class pg{
function genpage(&$sql,$page_size=2)
{
global $prepage,$nextpage,$pages,$sums; //out param
$page = $_GET["page"];
$eachpage = $page_size;
$pagesql = strstr($sql," from ");
$pagesql = "select count(*) as ids ".$pagesql;
$result = mysql_query($pagesql) or die(mysql_error());
if($rs = mysql_fetch_array($result)) $sums = $rs[0];
$pages = ceil(($sums-0.5)/$eachpage)-1;
$pages = $pages>=0?$pages:0;
$prepage = ($page>0)?$page-1:0;
$nextpage = ($page<$pages)?$page+1:$pages;
$startpos = $page*$eachpage;
$sql .=" limit $startpos,$eachpage ";
}
function showpage()
{
global $page,$pages,$prepage,$nextpage,$queryString;
$queryString=$_SERVER['QUERY_STRING'];
if(preg_match("/page/"