一个好的分页算法, 应该具有下面的优点:
当前页码应该尽量在正中间.
如果"首页"和"尾页"不可用(当前处于第一页或最后一页), 不要隐藏这两组文字, 以免链接按钮位置变动.
算法简单.
下面的算法具有前面1和3两个优点.
// $curr_index, 当前页码.
// $link_count, 链接数量.
// $page_count, 当前的数据的总页数.
// $start, 显示时的起始页码.
// $end, 显示时的终止页码.
$start = max(1, $curr_index - intval($link_count/2));
$end = min($start + $link_count - 1, $page_count);
$start = max(1, $end - $link_count + 1);
start = Math.max(1, curr_index - parseInt(link_count/2));
end = Math.min(page_count, start + link_count - 1);
start = Math.max(1, end - link_count + 1);

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