使用PHP检测浏览器是否刷新

问题描述：

我想检测是否使用PHP刷新了浏览器，如果刷新了浏览器，应该执行什么特定的PHP代码.

I want to detect whether the browser is refreshed or not using PHP, and if the browser is refreshed, what particular PHP code should execute.

答

如果刷新了页面，那么您期望两个紧随其后的请求使用相同的URL(路径，文件名，查询字符串)，并且请求相同表单内容(如果有)(POST数据).这可能是很多数据，因此最好对其进行哈希处理.所以...

If the page was refreshed then you'd expect two requests following each other to be for the same URL (path, filename, query string), and the same form content (if any) (POST data). This could be quite a lot of data, so it may be best to hash it. So ...


<?php
session_start();

//The second parameter on print_r returns the result to a variable rather than displaying it
$RequestSignature = md5($_SERVER['REQUEST_URI'].$_SERVER['QUERY_STRING'].print_r($_POST, true));

if ($_SESSION['LastRequest'] == $RequestSignature)
{
  echo 'This is a refresh.';
}
else
{
  echo 'This is a new request.';
  $_SESSION['LastRequest'] = $RequestSignature;
}

在AJAX情况下，您必须注意将这段代码放入哪些文件中，以免为异步调用的脚本更新LastRequest签名.

In an AJAX situation you'd have to be careful about which files you put this code into so as not to update the LastRequest signature for scripts which were called asynchronously.

使用PHP检测浏览器是否刷新

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