PHP怎么制作分页

方法/步骤

首先要了解下分页的原理即
SELECT * FROM table …… limit 开始位置 , 操作条数
开始位置从0开始
SELECT * FROM table …… limit 0 , 20
取最前面20条
SELECT * FROM table …… limit 10 , 20
11条到20条
其次分页要用的公式
得到公式
(当前页数 - 1 )X 每页条数 , 每页条数
Select * from table limit ($Page- 1) * $PageSize, $PageSize

还要了解parse_url()解析URL函数
parse_url() 是讲URL解析成有固定键值的数组的函数
$ua=parse_url("http://username:password@hostname/path?arg=value#anchor");
print_r($ua);
结果:
Array
(
[scheme] => http
[host] => hostname
[user] => username
[pass] => password
[path] => /path
[query] => arg=value
[fragment] => anchor
)

创建数据库bbs和表test有
CREATE TABLE `test` (
`id` int(11) NOT NULL auto_increment,
`name` varchar(50) character set gb2312 NOT NULL,
`sex` varchar(2) character set gb2312 NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=11 ;
然后插入十几条测试数据即可

写mysql数据库连接代码保存conn.php文件里
代码如下
$conn = @ mysql_connect("localhost", "root", "") or die("数据库链接错误");
mysql_select_db("bbs", $conn);
mysql_query("set names 'GBK'"); //使用GBK中文编码;
function htmtocode($content) {
$content = str_replace("\n", "
", str_replace(" ", " ", $content));
return $content;
}
//$content=str_replace("'","'",$content);
//htmlspecialchars();
?>

写分页函数page.php
代码如下
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) {
$url_query = ereg_replace("(^|&)page=$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 $totle 条记录";
//如果只有一页则跳出函数:
if ($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)
$pagenav .= "$i\n";
else
$pagenav .= "$i\n";
}
$pagenav .= " 页,共 $lastpg 页";
}
include("conn.php");
$result=mysql_query("SELECT * FROM `test`");
$total=mysql_num_rows($result);
//调用pageft(),每页显示10条信息(使用默认的20时,可以省略此参数),使用本页URL(默认,所以省略掉).
_PAGEFT($total,5);
echo $pagenav;
$result=mysql_query("SELECT * FROM `test` limit $firstcount,$displaypg ");
while($row=mysql_fetch_array($result)){
echo "