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Home Backend Development PHP Tutorial 今日话题数量如何实现

今日话题数量如何实现

Jun 06, 2016 pm 08:30 PM
php

就是一般论坛的今天发帖数量是怎么实现的 是不是php自动24点的时候清空下数据库里面今天发帖数吗 有大神给段代码吗

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就是一般论坛的今天发帖数量是怎么实现的 是不是php自动24点的时候清空下数据库里面今天发帖数吗 有大神给段代码吗

具体要看你需求有多大,比如小论坛帖子数量比较少,直接使用 sql 查询当天的数量

<code>select count(*) from item where created_at >= curdate();
</code>
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但是用户多一点,帖子也多了一点,总是实时计算,性能不好,你可以建立一张表,有用户发新帖的时候将数量 +1

<code>create table topics_num (created_date date, num int, primary key (created_date));
-- 查询
select num from topics_num where created_date = curdate();
</code>
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但是用户又多了,帖子又多了一点,总是要查询数据库,性能又不好了,而且还有并发问题导致数量不正确,这时候需要更快的计算方式,使用缓存,比如 redis

<code>$t = new DateTime('today');
$key = 'topics_num_' . $t->format('Y-m-d');

// 当有人发新帖时
$redis->incr($key);

// 需要获取数量时
$redis->get($key);
</code>
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可以有多种实现方式。
redis,文本,SQL都OK

写个定时化任务搞之

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