PHP实例教程：结合mysql分页制作
1、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 , 2011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)
2、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
3、写mysql数据库连接代码保存conn.php文件里
代码如下
<?php$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", "<br>", str_replace(" ", " ", $content));return $content;}//$content=str_replace("'","'",$content);//htmlspecialchars();?>
4、写分页函数page.php
代码如下<?phpfunction _PAGEFT($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 <B>" . ($totle ? ($firstcount +1) : 0) . "</B>-<B>" . min($firstcount + $displaypg, $totle) . "</B> 条记录,共 $totle 条记录";//如果只有一页则跳出函数:if ($lastpg <= 1)return false;$pagenav .= " <a href='$url=1'>首页</a> ";if ($prepg)$pagenav .= " <a href='$url=$prepg'>前页</a> ";else$pagenav .= " 前页 ";if ($nextpg)$pagenav .= " <a href='$url=$nextpg'>后页</a> ";else$pagenav .= " 后页 ";$pagenav .= " <a href='$url=$lastpg'>尾页</a> ";//下拉跳转列表,循环列出所有页码:$pagenav .= " 到第 <select name='topage' size='1' onchange='window.location=\"$url=\"+this.value'>\n";for ($i = 1; $i <= $lastpg; $i++) {if ($i == $page)$pagenav .= "<option value='$i' selected>$i</option>\n";else$pagenav .= "<option value='$i'>$i</option>\n";}$pagenav .= "</select> 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 "<hr><b>".$row[name]." | ".$row[sex];}?>
5、调用数据和分页list.php
<?php/*** 爱微网 www.iiwnet.com/php/*/include("conn.php");$pagesize=5;$url=$_SERVER["REQUEST_URI"];$url=parse_url($url);$url=$url[path];$numq=mysql_query("SELECT * FROM `test`");$num = mysql_num_rows($numq);if($_GET[page]){$pageval=$_GET[page];$page=($pageval-1)*$pagesize;$page.=',';}if($num > $pagesize){if($pageval<=1)$pageval=1;echo "共 $num 条"." <a href=$url?page=".($pageval-1).">上一页</a> <a href=$url?page=".($pageval+1).">下一页</a>";} echo $SQL="SELECT * FROM `test` limit $page $pagesize "; $query=mysql_query($SQL); while($row=mysql_fetch_array($query)){ echo "<hr><b>".$row[name]." | ".$row[sex]; }?>