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<?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; //导航页源码传递的变量
        $this->_listStart = ($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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