PHP分页

<?php
// Page分页函数
$page = $_GET["page"];
function Page($rows,$page_size){
global $page,$select_from,$select_limit,$pagenav;
$page_count = ceil($rows/$page_size);
if($page <= 1 || $page == '') $page = 1;
if($page >= $page_count) $page = $page_count;
$select_limit = $page_size;
$select_from = ($page - 1) * $page_size.',';
$pre_page = ($page == 1)? 1 : $page - 1;
$next_page= ($page == $page_count)? $page_count : $page + 1 ;
$pagenav .= "第 $page/$page_count 页 共 $rows 条记录 ";
$pagenav .= "<a href='?page=1'>首页</a> ";
$pagenav .= "<a href='?page=$pre_page'>前一页</a> ";
$pagenav .= "<a href='?page=$next_page'>后一页</a> ";
$pagenav .= "<a href='?page=$page_count'>末页</a>";
$pagenav.="　跳到<select name='topage' size='1' onchange='window.location="?page="+this.value'> ";
for($i=1;$i<=$page_count;$i++){
if($i==$page) $pagenav.="<option value='$i' selected>$i</option> ";
else $pagenav.="<option value='$i'>$i</option> ";
}
} // Page分页函数
// 使用示例
if (!$conn= mysql_connect("localhost", "root" ,"root1234")) die('数据库选择失败！');
if (!mysql_select_db("rlzydata", $conn)) die('数据库选择失败！');
mysql_query('set names UTF8');
// 用Page函数计算出 $select_from 从哪条记录开始检索、$pagenav 输出分页导航
$rows = mysql_num_rows(mysql_query("select * from rs_jcb"));
Page($rows,2);
$sql = "select * from rs_jcb limit $select_from $select_limit";
$rst = mysql_query($sql);
while ($row = mysql_fetch_array($rst)){
echo "$row[jcbId] - $row[userId] - $row[jcbNr] - $row[jcbJk] - $row[jcbTime] <hr />";
}
echo $pagenav;