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PHP代码

<?php
class Pager
{
var $_perPage; //每一页记录数
var $_totalItems; //总记录数
var $_totalPages; //总共页数
var $_currentPage; // 当前页序号
var $_listStart; //当前头条记录ID
var $_listEnd; //当前最后条记录ID
var $_pageStart; //第一页
var $_pageEnd; //最后页
var $_listPage; //循环显示当前分页列表
var $_pageData; //当前要显示的记录
var $_linkData; //页面传递的变量
var $_startId; //从数据库读出的启始id
function pager($_totalItems, $_perPage, $_linkData)
{
$this->_currentPage = max((int)@$_GET['pageId'], 1); //当前的页序号
$this->_perPage = $_perPage; //每一页记录数
$this->_totalItems = $_totalItems; //总记录数
$this->_totalPages = ceil($this->_totalItems / $this->_perPage); //总页数
$this->_linkData = $_linkData; //传递的变量
$this->_listStart = ($this->_currentPage - 1) * $this->_perPage + 1; //当前头条记录ID
$this->_listEnd = ($this->_currentPage != $this->_totalPages) ? $this->_currentPage * $this->_perPage : $this->_totalItems; //当前最后条记录ID
$this->_startId = $this->_listStart -1; //从数据库读出的启始id
}
function startId() // 从数据库读出的启始id
{
return $this->_startId;
}
function totalItems() // 总记录数
{
return $this->_totalItems;
}
function totalPages() // 总页数
{
return $this->_totalPages;
}
function listStart() // 当前头条记录ID
{
return $this->_listStart;
}
function listEnd() // 当前最后条记录ID
{
return $this->_listEnd;
}
function currentPage() // 当前页
{
return $this->_currentPage;
}
function pageStart() // 第一页
{
return $this->_pageStart = "<a href=" . $_SERVER['PHP_SELF'] . ($this->_linkData) . "&pageId=1><FONT title=首页 face=webdings>9</FONT></a>";
}
function pageEnd() // 最后页
{
return $this->_pageEnd = "<a href=" . $_SERVER['PHP_SELF'] . ($this->_linkData) . "&pageId=" . $this->_totalPages . "><FONT title=尾页 face=webdings>:</FONT></a>";
}
function upPage() // 上一页
{
if ($this->_currentPage > 1 and $this->_currentPage <= $this->_totalPages)
{
$up = $this->_currentPage-1;
return $this->_upPage = "<a href=" . $_SERVER['PHP_SELF'] . ($this->_linkData) . "&pageId=" . $up . "><FONT title=上页 face=webdings>7</FONT></a>";
}
}
function downPage() // 下一页
{
$down = $this->_currentPage + 1;
if ($this->_currentPage < $this->_totalPages)
return $this->_downPage = "<a href=" . $_SERVER['PHP_SELF'] . ($this->_linkData) . "&pageId=" . $down . "><FONT title=下页 face=webdings>8</FONT></a>";
}
function listPage() // 循环显示当前分页列表
{
if ($this->_currentPage <= 5 and $this->_currentPage != "")
{
$start = 1;
if ($this->_totalPages < 10) $end = $this->_totalPages;
else $end = 10;
} elseif (($this->_currentPage + 5) > $this->_totalPages)
{
$start = $this->_currentPage - 5;
$end = $this->_totalPages;
}
else
{
$start = $this->_currentPage - 4;
$end = $this->_currentPage + 5;
}
for($i = $start; $i <= $end; $i++)
{
$this->_listPage .= "<a href=" . $_SERVER['PHP_SELF'] . ($this->_linkData) . "&pageId=" . $i . ">" . $i . "</a> ";
}
return $this->_listPage;
}
function jumpPage() // 跳转
{
$this->_jumpPage = "<table border=0 width=100% class='fonts'><tr><td>跳转 <select name='pageId' style='height=14px' onchange=\"location='" . $_SERVER['PHP_SELF'] . ($this->_linkData) . "&pageId='+this.value;\">"; //页面跳转
for($i = 1; $i <= $this->_totalPages; $i++)
{
if ($i == $this->_currentPage) $selected = "selected";
$this->_jumpPage .= "<option value='$i' $selected>$i</option>";
unset($selected);
}
return $this->_jumpPage .= "</select> 页</td></tr></table>";
}
}
// /范例
$totalItems = 1100; //总记录
$page = new Pager($totalItems, 20, "?a=b&c=6");
for($i = $page->startId(); $i <= $page->startId() + 20; $i++)
{
$data[] = array($i, $i + 1);
}
echo "当前开始ID：" . $listStart = $page->listStart();
echo "<br>";
echo "当前结束ID：" . $listEnd = $page->listEnd();
echo "<br>";
echo "第一页：" . $pageStart = $page->pageStart();
echo "<br>";
echo "最后页：" . $pageEnd = $page->pageEnd();
echo "<br>";
echo "上一页：" . $upPage = $page->upPage();
echo "<br>";
echo "下一页：" . $downPage = $page->downPage();
echo "<br>";
echo "列表显示：" . $listPage = $page->listPage();
echo "<br>";
echo "跳转页：" . $jumpPage = $page->jumpPage();
echo "<br>";
// print_r($data);
?>

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