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;
    }
}