PHP-Cookie变量和会话变量的有趣行为 [英] PHP - funny behaviour of cookie variables and session variables

问题描述

我在下面写了一些PHP脚本来演示我的问题。像这样运行以下代码： http：//localhost/test.php？test = 10 ，然后运行 http：//localhost/test.php？test = 11 ，然后运行 http：//localhost/test.php？test = 12 ，依此类推。您将看到该数字已回显到您的屏幕上的网址号始终是1位数字吗？

 
 
 //如果查询字符串具有$ test，则存储在其中会话，并在稍后提供Cookie。 
 if（$ _ GET [test]）{
 $ _SESSION [’test’] = $ _GET [test]; 
 setcookie（ test，$ _GET [test]，time（）+ 60 * 60 * 24 * 30 * 12 * 10）; // 10年
} 
 
 //如果用户稍后返回，则从cookie 
中获取$ test if（isset（$ _ COOKIE [ test]））{
 $ _SESSION ['test'] = $ _COOKIE [ test]; 
} 
 
回显会话测试：。 $ _SESSION ['test']; 
 

后来，我用下面的代码解决了这个问题，但是解决起来还不够好，我想知道为什么会这样！ / p>

此问题已解决：

 
 
 if（$ _ GET [cid ]）{
 setcookie（ campaignid，$ _GET [cid]，time（）+ 60 * 60 * 24 * 30 * 12 * 10）; // 10年
 $ _SESSION ['campaignid'] = $ _GET [cid]; 
} elseif（isset（$ _ COOKIE [ campaignid]））{
 $ _SESSION ['campaignid'] = $ _COOKIE [ campaignid]; 
} 
 
 

解决方案

我无法获取cookie并立即读取相同的cookie？

是。您发送的Cookie仅在下一个请求中才能在$ _COOKIE数组中使用，因为$ _COOKIE超全局数组中填充了客户端请求中的数据。最初的请求什么都没有。

I wrote a little PHP script below to demonstrate my question. Run the code below like this: http://localhost/test.php?test=10, then run http://localhost/test.php?test=11, then http://localhost/test.php?test=12, etc. You will see that the number echo'ed to your screen is always 1 digit behind the url number?! Maybe because I cant a cookie and immediately read the same cookie?

//If query string has $test, store in session, and cookie for later. 
if($_GET[test]){
  $_SESSION['test'] = $_GET[test];
  setcookie("test", $_GET[test], time()+60*60*24*30*12*10); //10 years
}

//If user comes back later, then get $test from cookie
if (isset($_COOKIE["test"])){
  $_SESSION['test'] = $_COOKIE["test"];
}

echo "session test: " . $_SESSION['test'];

Later, I solved the problem with the following code, but solving it is not good enough, I want to know WHY this happened!

This solved it:

if($_GET[cid]){
  setcookie("campaignid", $_GET[cid], time()+60*60*24*30*12*10); //10 years
  $_SESSION['campaignid'] = $_GET[cid];
}elseif (isset($_COOKIE["campaignid"])){
  $_SESSION['campaignid'] = $_COOKIE["campaignid"];
}

解决方案

Maybe because I cant a cookie and immediately read the same cookie?

Exactly. The cookie you sent is available in $_COOKIE array only in the next request, because the $_COOKIE superglobal array is filled with the data, that comes in the client's request. And at first request it is nothing.

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