Examples of paging principles in php
Examples of paging principles in php
<?php
1.分页原理
所需数据：
总记录数： $records mysql_num_rows()
每页显示： $pagesize 人为定义10
总页数： $pages $records/$pagesize
当前页： $page 自己选择
2.分页的sql语句： SELECT * FROM news limit 0,10; //每次从数据库取10条数据
limit 语句的格式：
$startnow:开始行号 $pagesize:每页显示多少条
limit $startnow,$pagesize
第1页 $page = 1 limit 0,10 从0条起取10条数据
第2页 $page = 2 limit 10,10
第3页 $page = 3 limit 20,10
........
$startnow = ($page-1) * $pagesize;
3.
//分页相关变量
$pagesize = 10; //每页取10条数据
//获取地址栏中用户点击后地址栏传递过来的page参数（第几页）
if(empty($_REQUEST['page'])){
$page =1;
$startnow =0;
}else{
$page = (int)$_REQUEST['page'];
$startnow = ($page-1) * $pagesize;
}
//构建sql语句
$sql = select * from vvt_news; //可以取出结果分页中再排序
//执行sql语句
$result = mysql_query($sql);
//返回记录总数
$records = mysql_num_rows($result);
//获取总页数
$pages = ceil($records/$pagesize);
//构建分页的sql语句
$sql = "select * from vvt_news order addtime ASC,by id DESC LIMIT $startnow,$pagesize";
//执行sql语句 返回结果集
$result = mysql_query($sql); //结果集 可以取前端循环
$this->set('list', $result); //发送到前台 遍历循环
4.前台底部分页样式
<style type="text/css">
.pagelist{
height:40px;
line-height:40px;
}
.pagelist a{
border:1px solid #ccc;
background-color:#f0f0f0;
padding:3px 8px;
margin:0px; 3px;
}
.pagelist span {
margin:3px 10px;
}
</style>
<tr>
<td colspan="8" align="center" class="pagelist">
<?php
for ($i=1; $i<$pages ; $i++) {
//如果是当前页则不加链接
if($i==$page){
echo "<span>$i</span>";
}else{
echo "<a href='magin.php?page=$i'>$i</a>";
}
}
;?>
</td>
</tr>
-->2
<tr>
<td colspan="8" align="center" class="pagelist">
<?php
$prev=$page-3;
$next=$page+3;
for ($i=$prev; $i<$next ; $i++) {
//如果是当前页则不加链接
if($i==$page){
echo "<span>$i</span>";
}else{
echo "<a href='magin.php?page=$i'>$i</a>";
}
}
;?>
</td>
</tr>
-->3
<tr>
<td colspan="8" align="center" class="pagelist">
<?php
$prev=$page-3;
$next=$page+3;
if($prev<1){
$prev=1;
}
if($nest > $pages){
$next=$pages;
}
for ($i=$prev; $i<$next ; $i++) {
//如果是当前页则不加链接
if($i==$page){
echo "<span>$i</span>";
}else{
echo "<a href='magin.php?page=$i'>$i</a>";
}
}
;?>
</td>
</tr>
-->4 判断当前页小于4,让分页始终保持7个The above is the detailed content of Examples of paging principles in php. For more information, please follow other related articles on the PHP Chinese website!
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