class PageModel {  
    /** 
     * 獲取分頁數組 
     * @param unknown $page 當前頁面數 
     * @param unknown $goodsCount 商品總數 
     * @param unknown $pageLength 每個頁面展示頁面數 
     */  
    public static function getPageArr($page, $goodsCount, $pageCountLength, $pageLength) {  
        //頁面總數  
        $allPageCount = ceil($goodsCount / $pageLength);  
       //如果頁面總是比長度短，設定頁面長度為頁面總數  
       if ($allPageCount <= $pageCountLength) {  
           $allPageCount = ceil($goodsCount / $pageLength);  
       }  
        //總頁面數一頁展示完  
        if ($allPageCount <= $pageCountLength) {  
            for ($i = 0; $i < $allPageCount; $i ++) {  
                $arr[] = array('page' => $i + 1);  
            }  
            return $arr;  
        }  
        //前后的長度  
        $halfLength = floor($pageCountLength / 2);  
        //因為太小，所以放原來位置，左邊  
        if ($page <= $halfLength) {  
            $arr = array();  
            for ($i = 0; $i < $pageCountLength; $i ++) {  
                $arr[] = array('page' => $i + 1);  
            }  
            return $arr;  
        }  
        //太大，只取到邊緣，超出也只取到邊緣  
        if ($page > $allPageCount - floor($pageCountLength / 2)) {  
            for ($i = -$pageCountLength; $i < 0; $i ++) {  
                $arr[] = array('page' => $allPageCount + $i + 1);  
            }  
            return $arr;  
        }  
        //中間的數，把中間的取出來  
        for ($i = -$halfLength; $i < $pageCountLength - $halfLength; $i ++) {  
            $arr[] = array('page' => $page + $i);  
        }
        return $arr;
    }
}