// 禁止直接访问该页面
if (basename($HTTP_SERVER_VARS['PHP_SELF']) == "pager.class.php") {
header("HTTP/1.0 404 Not Found");
}
class Pager
{
/**Total number of messages*/
var $infoCount;
/**Total pages*/
var $pageCount;
/**Number of items displayed per page*/
var $items;
/**Current page number*/
var $pageNo;
/**The starting position of the query*/
var $startPos;
var $nextPageNo;
var $prevPageNo;
function Pager($infoCount, $items, $pageNo)
{
$this->infoCount = $infoCount;
$this->items = $items;
$this->pageNo = $pageNo;
$this->pageCount = $this->GetPageCount();
$this->AdjustPageNo();
$this->startPos = $this->GetStartPos();
}
function AdjustPageNo()
{
if($this->pageNo == '' || $this->pageNo < 1)
$this->pageNo = 1;
if ($this->pageNo > $this->pageCount)
$this->pageNo = $this->pageCount;
}
/**
*Next page
*/
function GoToNextPage()
{
$nextPageNo = $this->pageNo 1;
if ($nextPageNo > $this->pageCount)
{
$this->nextPageNo = $this->pageCount;
return false;
}
$this->nextPageNo = $nextPageNo;
return true;
}
/**
* Previous page
*/
function GotoPrevPage()
{
$prevPageNo = $this->pageNo - 1;
if ($prevPageNo < 1)
{
$this->prevPageNo = 1;
return false;
}
$this->prevPageNo = $prevPageNo;
return true;
}
function GetPageCount()
{
return ceil($this->infoCount / $this->items);
}
function GetStartPos()
{
return ($this->pageNo - 1) * $this->items;
}
}
?>