php简单分页类实现方法

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;
    }
}