php简单分页代码学习php分页原理

<?php
include("conn.php"); //数据库链接，自己解决
 
$sql="select * from news";
$query=mysql_query($sql);
$all_num=mysql_num_rows($query); //总条数
$page_num=3; //每页条数
$page_all_num = ceil($all_num/$page_num); //总页数
$page=empty($_GET['page'])?1:$_GET['page']; //当前页数
$page=(int)$page; //安全强制转换
$limit_st = ($page-1)*$page_num; //起始数
//===php分页代码 关键
$sql="select * from news limit $limit_st , $page_num";

$query=mysql_query($sql);
    while($row=mysql_fetch_array($query)){
       echo $row['title']." <a href='view.php?id={$row['id']}'>浏览</a><hr>";
}
 
$px = $page>=$page_all_num ? $page_all_num : $page+1 ;
$ps = $page<=1 ? 1 : $page-1 ;
?>
<a href='page.php'>首页 </a> |
<a href='page.php?page=<?php echo $ps?>'>上一页 </a> |
<a href='page.php?page=<?php echo $px?>'>下一页 </a> |
<a href='page.php?page=<?php echo $page_all_num?>'>尾页 </a>