<?php
// 建立數(shù)據(jù)庫(kù)連接
$link = mysql_connect("localhost", "mysql_user", "mysql_password")
or die("Could not connect: " . mysql_error());
// 獲取當(dāng)前頁(yè)數(shù)
if( isset(
$_GET['page']) ){
$page = intval(
$_GET['page'] );
}
else{
$page = 1;
}
// 每頁(yè)數(shù)量
$PageSize = 10;
// 獲取總數(shù)據(jù)量
$sql = "select count(*) as amount from table";
$result = mysql_query($sql);
$row = mysql_fetch_row($result);
$amount = $row['amount'];
// 記算總共有多少頁(yè)
if( $amount ){
if( $amount < $page_size ){ $page_count = 1; } //如果總數(shù)據(jù)量小于$PageSize，那么只有一頁(yè)
if( $amount % $page_size ){ //取總數(shù)據(jù)量除以每頁(yè)數(shù)的余數(shù)
$page_count = (int)($amount / $page_size) + 1; //如果有余數(shù)，則頁(yè)數(shù)等于總數(shù)據(jù)量除以每頁(yè)數(shù)的結(jié)果取整再加一
}else{
$page_count = $amount / $page_size; //如果沒(méi)有余數(shù)，則頁(yè)數(shù)等于總數(shù)據(jù)量除以每頁(yè)數(shù)的結(jié)果
}
}
else{
$page_count = 0;
}

// 翻頁(yè)鏈接
$page_string = '';
if( $page == 1 ){
$page_string .= '第一頁(yè)|上一頁(yè)|';
}
else{
$page_string .= '<a href="/?page=1>";第一頁(yè)</a>|<a href="/?page='."($page-1).'>上一頁(yè)</a>|';
}
if( ($page == $page_count) || ($page_count == 0) ){
$page_string .= '下一頁(yè)|尾頁(yè)';
}
else{
$page_string .= '<a href="/?page='."($page+1).'>下一頁(yè)</a>|<a href="/?page='."$page_count.'>尾頁(yè)</a>';
}
// 獲取數(shù)據(jù)，以二維數(shù)組格式返回結(jié)果
if( $amount ){
$sql = "select * from table order by id desc limit ". ($page-1)*$page_size .", $page_size";
$result = mysql_query($sql);

while ( $row = mysql_fetch_row($result) ){
$rowset[] = $row;
}
}else{
$rowset = array();
}
// 沒(méi)有包含顯示結(jié)果的代碼，那不在討論范圍，只要用foreach就可以很簡(jiǎn)單的用得到的二維數(shù)組來(lái)顯示結(jié)果
?>

<?php
// FileName: Pager.class.php
// 分頁(yè)類，這個(gè)類僅僅用于處理數(shù)據(jù)結(jié)構(gòu)，不負(fù)責(zé)處理顯示的工作
Class Pager
{
var $PageSize; //每頁(yè)的數(shù)量
var $CurrentPageID; //當(dāng)前的頁(yè)數(shù)
var $NextPageID; //下一頁(yè)
var $PreviousPageID; //上一頁(yè)
var $numPages; //總頁(yè)數(shù)
var $numItems; //總記錄數(shù)
var $isFirstPage; //是否第一頁(yè)
var $isLastPage; //是否最后一頁(yè)
var $sql; //sql查詢語(yǔ)句

function Pager($option)
{
global $db;
$this->_setOptions($option);
// 總條數(shù)
if ( !isset($this->numItems) )
{
$res = $db->query($this->sql);
$this->numItems = $res->numRows();
}
// 總頁(yè)數(shù)
if ( $this->numItems > 0 )
{
if ( $this->numItems < $this->PageSize ){ $this->numPages = 1; }
if ( $this->numItems % $this->PageSize )
{
$this->numPages= (int)($this->numItems / $this->PageSize) + 1;
}
else
{
$this->numPages = $this->numItems / $this->PageSize;
}
}
else
{
$this->numPages = 0;
}

switch ( $this->CurrentPageID )
{
case $this->numPages == 1:
$this->isFirstPage = true;
$this->isLastPage = true;
break;
case 1:
$this->isFirstPage = true;
$this->isLastPage = false;
break;
case $this->numPages:
$this->isFirstPage = false;
$this->isLastPage = true;
break;
default:
$this->isFirstPage = false;
$this->isLastPage = false;
}

if ( $this->numPages > 1 )
{
if ( !$this->isLastPage ) { $this->NextPageID = $this->CurrentPageID + 1; }
if ( !$this->isFirstPage ) { $this->PreviousPageID = $this->CurrentPageID - 1; }
}

return true;
}

/***
*
* 返回結(jié)果集的數(shù)據(jù)庫(kù)連接
* 在結(jié)果集比較大的時(shí)候可以直接使用這個(gè)方法獲得數(shù)據(jù)庫(kù)連接，然后在類之外遍歷，這樣開(kāi)銷較小
* 如果結(jié)果集不是很大，可以直接使用getPageData的方式獲取二維數(shù)組格式的結(jié)果
* getPageData方法也是調(diào)用本方法來(lái)獲取結(jié)果的
*
***/

function getDataLink()
{
if ( $this->numItems )
{
global $db;

$PageID = $this->CurrentPageID;

$from = ($PageID - 1)*$this->PageSize;
$count = $this->PageSize;
$link = $db->limitQuery($this->sql, $from, $count); //使用Pear DB::limitQuery方法保證數(shù)據(jù)庫(kù)兼容性

return $link;
}
else
{
return false;
}
}

/***
*
* 以二維數(shù)組的格式返回結(jié)果集
*
***/

function getPageData()
{
if ( $this->numItems )
{
if ( $res = $this->getDataLink() )
{
if ( $res->numRows() )
{
while ( $row = $res->fetchRow() )
{
$result[] = $row;
}
}
else
{
$result = array();
}

return $result;
}
else
{
return false;
}
}
else
{
return false;
}
}

function _setOptions($option)
{
$allow_options = array(
'PageSize',
'CurrentPageID',
'sql',
'numItems'
);

foreach ( $option as $key => $value )
{
if ( in_array($key, $allow_options) && ($value != null) )
{
$this->$key = $value;
}
}

return true;
}
}
?>

<?php
// FileName: test_pager.php
// 這是一段簡(jiǎn)單的示例代碼，前邊省略了使用pear db類建立數(shù)據(jù)庫(kù)連接的代碼
require "Pager.class.php";
if ( isset(
$_GET['page']) )
{
$page = (int)
$_GET['page'];
}
else
{
$page = 1;
}
$sql = "select * from table order by id";
$pager_option = array(
"sql" => $sql,
"PageSize" => 10,
"CurrentPageID" => $page
);
if ( isset(
$_GET['numItems']) )
{
$pager_option['numItems'] = (int)
$_GET['numItems'];
}
$pager = @new Pager($pager_option);
$data = $pager->getPageData();
if ( $pager->isFirstPage )
{
$turnover = "首頁(yè)|上一頁(yè)|";
}
else
{
$turnover = "<a href='?page=1&numItems=".$pager->numItems."'>首頁(yè)</a>|<a href="/?page=".$pager->PreviousPageID."&numItems=".$pager->numItems."'>上一頁(yè)</a>|";
}
if ( $pager->isLastPage )
{
$turnover .= "下一頁(yè)|尾頁(yè)";
}
else
{
$turnover .= "<a href="/?page=".$pager->NextPageID."&numItems=".$pager->numItems."'>下一頁(yè)</a>|<a href="/?page=".$pager->numPages."&numItems=".$pager->numItems."'>尾頁(yè)</a>";
}
?>

<?php
Class MemberPager extends Pager
{
function showMemberList()
{
global $db;

$data = $this->getPageData();
// 顯示結(jié)果的代碼
// ......
}
}
/// 調(diào)用
if ( isset(
$_GET['page']) )
{
$page = (int)
$_GET['page'];
}
else
{
$page = 1;
}
$sql = "select * from members order by id";
$pager_option = array(
"sql" => $sql,
"PageSize" => 10,
"CurrentPageID" => $page
);
if ( isset(
$_GET['numItems']) )
{
$pager_option['numItems'] = (int)
$_GET['numItems'];
}
$pager = @new MemberPager($pager_option);
$pager->showMemberList();
?>