php+mysql分页代码详解_php技巧

代码如下:
$perpagenum = 10;//定义每页显示几条
$total = mysql_fetch_array(mysql_query("select count(*) from a"));//查询数据库中一共有多少条数据
$Total = $total[0]; //
$Totalpage = ceil($Total/$perpagenum);//上舍，取整
if(!isset($_GET['page'])||!intval($_GET['page'])||$_GET['page']>$Totalpage)//page可能的四种状态
{
$page=1;
}
else
{
$page=$_GET['page'];//如果不满足以上四种情况，则page的值为$_GET['page']
}
$startnum = ($page-1)*$perpagenum;//开始条数
$sql = "select * from a order by id limit $startnum,$perpagenum";//查询出所需要的条数
echo $sql."
";
$rs = mysql_query($sql);
$contents = mysql_fetch_array($rs);
if($total)如果$total不为空则执行以下语句
{
do
{
$id = $contents['id'];
$name = $contents['name'];
?>

id:

name:

}
while($contents = mysql_fetch_array($rs));//do....while
$per = $page - 1;//上一页
$next = $page + 1;//下一页
echo "共有".$Total."条记录,每页".$perpagenum."条,共".$Totalpage."页 ";
if($page != 1)
{
echo "首页";
echo " 上一页";
}
if($page != $Totalpage)
{
echo " 下一页";
echo " 尾页";
}
}
else如果$total为空则输出No message
{
echo "No message";
}
?>