实现“上一页”和“下一页按钮

<?php  
//本例子摘自phpbuilder.com  
//稍加翻译  
//<sprming@netease.com>  

$limit=20; // 每页显示的行数  
$numresults=mysql_query("select * from TABLE where YOUR CONDITIONAL HERE order by WHATEVER");//换成你所需要的sql语句  
$numrows=mysql_num_rows($numresults);  

// next determine if offset has been passed to script, if not use 0  
if (empty($offset)) {  
$offset=1;  
}  

// 得到查询结果  
$result=mysql_query("select id,name,phone ".  
"from TABLE where YOUR CONDITIONAL HERE ".  
"order by WHATEVER limit $offset,$limit");  

// 现在显示查询结果  
while ($data=mysql_fetch_array($result)) {  
// 在这里插入您要显示的结果以及样式  
}  

// 显示按钮  

if ($offset！=1) { // bypass PREV link if offset is 1  
$prevoffset=$offset-20;  
print "<a href=https://www.jb51.net/\"$PHP_SELF?offset=$prevoffset\">上一页</a> &nbsp; \n";  
}  

// 计算页面数  
$pages=intval($numrows/$limit);  

// $pages now contains int of pages needed unless there is a remainder from division  
if ($numrows%$limit) {  
// has remainder so add one page  
$pages++;  
}  

for ($i=1;$i<=$pages;$i++) { // 显示页数  
$newoffset=$limit*($i-1);  
print "<a href=https://www.jb51.net/\"$PHP_SELF?offset=$newoffset\">$i</a> &nbsp; \n";  
}  

// check to see if last page  
if (!(($offset/$limit)==$pages) && $pages!=1) {  
// not last page so give NEXT link  
$newoffset=$offset+$limit;  
print "<a href=https://www.jb51.net/\"$PHP_SELF?offset=$newoffset\">下一页</a><p>\n";  
}  

?>