PHP paging class code example

<?php 
function genpage(&$sql,$page_size=10) 
{ 
global $pages,$sums,$eachpage,$page; //总页数，总记录，每页数，当前页 
$page = $_GET["page"]; 
if($page ==0)$page =1; 
$eachpage = $page_size; 
$pagesql = strstr($sql," from "); 
$pagesql = "select count(*) as ids ".$pagesql; 
$conn = mysql_query($pagesql) or die(mysql_error()); 
if($rs = mysql_fetch_array($conn))$sums = $rs[0]; 
$pages=ceil($sums/$eachpage); 
if($pages==0)$pages=1; 
$startpos = ($page-1)*$eachpage; 
$sql .=" limit $startpos,$eachpage "; 
} 

//显示分页 
function showpage() 
{ 
global $pages,$sums,$eachpage,$page; //总页数，总记录，每页数，当前页，其它参数 
$link=$_SERVER[&#39;PHP_SELF&#39;]; 
echo "记录".$sums.":".$eachpage."　"; 
echo "页数".$page."/".$pages."　"; 
$p_head=$page-5; 
if($p_head<=0)$p_head=1; //页码循环开始数 前5个 
$p_end=$page+5; 
if($p_end>$pages)$p_end=$pages; //页码循环结束数 后5个 
echo "[<a href=$link?page=1>首页</a>] "; 
for($i=$p_head;$i<=$p_end;$i++) 
{ 
if($i!=$page) 
echo "<a href=$link?page=$i>[$i]</a> "; 
else 
echo "<b><strike>[$i]</strike></b> "; 
} 
echo " [<a href=$link?page=$pages>末页</a>]"; 
} 
?>