phpmysql分页函数-PHP源码

+-----------------------------------------------------------------------
| 文件概要：分页显示函数
| 文件名称：page.php
| 创建时间：2010-5-20
+-----------------------------------------------------------------------
*/
function _pageft($totle, $displaypg = 20, $url = '') {

global $page, $firstcount, $pagenav, $_server;

$globals["displaypg"] = $displaypg;

if (!$page)
$page = 1;
if (!$url) {
$url = $_server["request_uri"];
}

//url分析：
$parse_url = parse_url($url);
$url_query = $parse_url["query"]; //单独取出url的查询字串
if ($url_query) {
$url_query = preg_replace("/(^|&)page=$page/", "", $url_query);
$url = str_replace($parse_url["query"], $url_query, $url);
if ($url_query)
$url .= "&page";
else
$url .= "page";
} else {
$url .= "?page";
}
$lastpg = ceil($totle / $displaypg); //最后页，也是总页数
$page = min($lastpg, $page);
$prepg = $page -1; //上一页
$nextpg = ($page == $lastpg ? 0 : $page +1); //下一页
$firstcount = ($page -1) * $displaypg;

//开始分页导航条代码：
$pagenav = "显示第 " . ($totle ? ($firstcount +1) : 0) . "-" . min($firstcount + $displaypg, $totle) . " 条记录  共 $totle 条留言";

//如果只有一页则跳出函数：
if ($lastpg <= 1)
return false;

$pagenav .= " 首页 ";
if ($prepg)
$pagenav .= " 前页 ";
else
$pagenav .= " 前页 ";
if ($nextpg)
$pagenav .= " 后页 ";
else
$pagenav .= " 后页 ";
$pagenav .= " 尾页 ";

//下拉跳转列表，循环列出所有页码：
$pagenav .= "　到第 n";
for ($i = 1; $i <= $lastpg; $i++) {
if ($i == $page)
$pagenav .= "$in";
else
$pagenav .= "$in";
}
$pagenav .= " 页   共 $lastpg 页";
}
?>