如何停止这个AJAX？

发布于 2024-08-16 05:23:31 字数 697 浏览 6 评论 0原文

我想用 PHP 实现 Comet，并遇到了这个页面：

http://www.zeitoun.net /articles/comet_and_php/start

文章中解释的第二种方法对我来说效果很好。在后端php文件中，循环似乎是无限的：

// infinite loop until the data file is not modified
  $lastmodif    = isset($_GET['timestamp']) ? $_GET['timestamp'] : 0;
  $currentmodif = filemtime($filename);
  while ($currentmodif <= $lastmodif) // check if the data file has been modified
  {
    usleep(10000); // sleep 10ms to unload the CPU
    clearstatcache();
    $currentmodif = filemtime($filename);
  }

当客户端离开页面时，如何告诉服务器停止处理循环？否则我担心循环会在服务器上一直持续下去，直到某些内容被修改为止。

原文

I wanted to implement Comet in PHP and came across this page:

http://www.zeitoun.net/articles/comet_and_php/start

The second method explained in the article works fine for me. In the backend php file, the loop seems to be infinite:

// infinite loop until the data file is not modified
  $lastmodif    = isset($_GET['timestamp']) ? $_GET['timestamp'] : 0;
  $currentmodif = filemtime($filename);
  while ($currentmodif <= $lastmodif) // check if the data file has been modified
  {
    usleep(10000); // sleep 10ms to unload the CPU
    clearstatcache();
    $currentmodif = filemtime($filename);
  }

When the client leaves the page, how to tell the server to stop processing the loop? Otherwise I fear that the loop is going to go on and on on the server until something is modified.

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