我想在PHP应用程序中的用户帖子之间强制执行n秒的延迟，我该怎么做？ [关闭]

Question

I want to prevent users (different clients) from posting data at the "same" time, I need them to wait n seconds after the last POST. Would some sort of server-side delay achieve this?

How does a PHP server attend clients? Is it one by one or at the same time?

Answer 1

You can store a timestamp in the session, plant a cookie, or store a timestamp in a database.

Session is probably the easiest, fastest and least invasive.

// 3600 seconds is 1 hour.
if ($_SESSION['last_post'] < time() + 3600)
{
  //cannot post
  return false;
}

// post comment.
$_SESSION['last_post'] = time();
return true

To apply to all users as a global effect use an apc cache entry or a database flag.

// 3600 seconds is 1 hour.
if (apc_fetch('comment_timeout' < time() + 3600)
{
  //cannot post
  return false;
}

// post comment.
apc_add('comment_timeout' , time());
return true