PHP练手小demo实现分页

创建表语句

CREATE TABLE `guestbook` (
  `id` mediumint(8) unsigned NOT NULL auto_increment,
  `nickname` char(15) NOT NULL default '',
  `email` varchar(100) NOT NULL default '',
  `content` text NOT NULL,
  `createtime` int(10) unsigned NOT NULL default '0',
  PRIMARY KEY  (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;

插入数据

insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('1',  'admin',    '[email protected]',  '留言测试', '1264167501');
insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('2',  'user', '[email protected]', '大家好',  '1264168127');
insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('3',  '小明',   '[email protected]', '做得好，继续努力。。',   '1264168865');
insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('4',  '小张',   '[email protected]',    '来看看',  '1264169118');
insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('5',  '小丽',   '[email protected]',   'haha', '1283276566');
insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('6',  'Tom',  '[email protected]',    'Hello',    '1283336218');
insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('7',  'Jack', '[email protected]', 'okok', '1283336315');
insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('8',  'admin',    '[email protected]',  '嗯嗯',   '1283336315');
insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('9',  '阿里巴巴', '[email protected]',    '来看看',  '1283337158');
insert into guestbook (`id`,`nickname`,`email`,`content`,`createtime`) values('10', '路人甲',  '[email protected]', '哈哈哈',  '1283338228');

源代码

<?php
    $host = 'localhost';
    $username = 'root';
    $password = '';
    $dbname = 'test';
    $port = '';

    $link = new mysqli($host,$username,$password,$dbname);
    if($link->connect_error){
        die('Connect Error('.$linlk->connect_erron.')'.$link->connect_error);
    }
    $link->set_charset("utf8");
    //每页显示的留言数
    $pageSize = 4;

    //确定当前页数$p 参数
    $p = isset($_GET['p']) ? $_GET['p'] : 1;
    //数据指针
    $offset = ($p-1)*$pageSize;

    //查询本页显示的数据
    $query_sql = "select * from guestbook order by id desc limit $offset,$pageSize";
    // echo $query_sql;
    $result = $link->query($query_sql);
    if($result){
          while($gblist = $result->fetch_array(MYSQLI_ASSOC)){
            echo '<a href="',$gblist['nickname'],'">',$gblist['nickname'],'</a> ';
            echo '发表于：',date("Y-m-d H:i", $gblist['createtime']),'<br />';
            echo '内容：',$gblist['content'],'<br /><hr />';
          }
    }

    //分页格式
    $count_sql = "select count(*) as count from guestbook";
    $count_result = $link->query($count_sql);
    $count_array = $count_result->fetch_assoc();
    $count = $count_array['count'];
    //计算总的页数
    $pagenum = ceil($count/$pageSize);
    echo '共',$count,'条留言';

    //循环输出各页数目及连接
    if($pagenum > 1){
        for($i=1;$i<=$pagenum;$i++){
            if($i == $p){
                echo "[$i]";
            }else{
                echo "[<a href='oPagenate.php?p=$i"."'>$i</a>]";
            }
        }
    }