php分页类实例 php与mysql简单分页类代码

class PageModel { 
    /**
     * 获取分页数组
     * @param unknown $page 当前页面数
     * @param unknown $goodsCount 商品总数
     * @param unknown $pageLength 每个页面展示页面数
     */ 
    public static function getPageArr($page, $goodsCount, $pageCountLength, $pageLength) { 
        //页面总数 
        $allPageCount = ceil($goodsCount / $pageLength); 
       //如果页面总是比长度短，设定页面长度为页面总数 
       if ($allPageCount <= $pageCountLength) { 
           $allPageCount = ceil($goodsCount / $pageLength); 
       } 
        //总页面数一页展示完 
        if ($allPageCount <= $pageCountLength) { 
            for ($i = 0; $i < $allPageCount; $i ++) { 
                $arr[] = array('page' => $i + 1); 
            } 
            return $arr; 
        } 
        //前后的长度 
        $halfLength = floor($pageCountLength / 2); 
        //因为太小，所以放原来位置，左边 
        if ($page <= $halfLength) { 
            $arr = array(); 
            for ($i = 0; $i < $pageCountLength; $i ++) { 
                $arr[] = array('page' => $i + 1); 
            } 
            return $arr; 
        } 
        //太大，只取到边缘，超出也只取到边缘 
        if ($page > $allPageCount - floor($pageCountLength / 2)) { 
            for ($i = -$pageCountLength; $i < 0; $i ++) { 
                $arr[] = array('page' => $allPageCount + $i + 1); 
            } 
            return $arr; 
        } 
        //中间的数，把中间的取出来 
        for ($i = -$halfLength; $i < $pageCountLength - $halfLength; $i ++) { 
            $arr[] = array('page' => $page + $i); 
        }
        return $arr;
    }
}

class Helper_Page{

/** 总信息数 */
var $infoCount;
/** 总页数 */
var $pageCount;
/** 每页显示条数　*/
var $items;
/** 当前页码 */
var $pageNo;
/** 查询的起始位置　*/
var $startPos;
/** 下一页　*/
var $nextPageNo;
/** 上一页　*/
var $prevPageNo;

function Helper_Page($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;
}
/**
* 下一页
*/
function GoToNextPage()
{
$nextPageNo = $this->pageNo + 1;
if ($nextPageNo > $this->pageCount)
{
$this->nextPageNo = $this->pageCount;
return false;
}
$this->nextPageNo = $nextPageNo;
return true;
}
/**
* 上一页
*/
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;
}
}