// 确定当前页数 $p 参数$p = $_GET['p']?$_GET['p']:1;// 数据指针$offset = ($p-1)*$pagesize;$query_sql = "SELECT * FROM guestbook ORDER BY id DESC LIMIT $offset , $pagesize";$result = mysql_query($query_sql);// 如果出现错误并退出if(!$result) exit('查询数据错误：'.mysql_error());// 循环输出while($gb_array = mysql_fetch_array($result)){?>.gif" /><?=$gb_array['nickname']?> [<?=date("Y-m-d H:i", $gb_array['createtime'])?>]
<?=nl2br($gb_array['content'])?>
<?php // 回复 if(!empty($gb_array['replytime'])) {?>管理员回复： [<?=date("Y-m-d H:i", $gb_array['replytime'])?>]
<?=nl2br($gb_array['reply'])?>
<?php } // 回复结束?><?php} //while循环结束?><?php//计算留言页数$count_result = mysql_query("SELECT count(*) FROM guestbook");$count_array = mysql_fetch_array($count_result);$pagenum = ceil($count_array['count(*)']/$pagesize);echo '共 ',$count_array['count(*)'],' 条留言';if ($pagenum > 1) { for($i=1;$i<=$pagenum;$i++) { if($i==$p) { echo ' [',$i,']'; } else { echo ' '.$i.''; } }}?>
数据库连接
<?php/******************************数据库连接*****************************/$conn = @mysql_connect("localhost","","");if (!$conn){ die("连接数据库失败：" . mysql_error());}mysql_select_db("guestbook", $conn);//字符转换，读库mysql_query("set character set 'gbk'");//写库mysql_query("set names 'gbk'");?> 数据库建立
CREATE TABLE `guestbook` ( `id` mediumint(8) unsigned NOT NULL auto_increment, `nickname` char(16) NOT NULL, `email` varchar(60) default NULL, `face` tinyint(2) unsigned NOT NULL default '1', `content` text NOT NULL, `createtime` int(10) unsigned NOT NULL default '0', `clientip` char(15) NOT NULL, `reply` text, `replytime` int(10) unsigned default NULL, PRIMARY KEY (`id`)) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=1 ;
但是一 测试就这句$p = $_GET['p']?$_GET['p']:1;报错 怎么办？
回复讨论(解决方案)
$_GET['p'] 是传入的变量，第一次执行就不会有，所以会报错
$p = isset($_GET['p']) ? $_GET['p'] : 1;