无法在Chrome中访问Cookie，在Firefox中可以正常工作 [英] Cannot access cookies in Chrome, works properly in Firefox

问题描述

基本情况和基本相关信息：
我有一个php代码，在打开< doctype> 标记之前执行。希望（如有必要）在加载其他任何内容之前，根据用户浏览器的语言偏好发送重定向。

脚本尝试根据支持的最高语言偏好来做两件事：

1. 使用php： setcookie（）创建包含两个字母的语言代码的cookie。
   
   
   
   • 示例Cookie名称=值：x_language = es
   
   


2. 使用php：header（ Location：。$ requestedSite）;重定向到子域，
   
   
   
   • 示例域：es.domain.com
   
   

示例：

  if（isset（ $ _COOKIE ['x_language']））{
-根据Cookie值确定正确的子域-
-如果当前不在该子域上，请重定向至该子域-
} else {
 setcookie（'x_language'，'es'，time（）+ 31536000，'/'，'。domain.com'）; 
 header（ Location：。$ requestedSite）; 
} 
  

问题：
Firefox运行正常完美。 Chrome（和其他浏览器）根本无法识别Cookie。

我将其归结为：

• print_r（$ _ COOKIE）在Firefox中正常工作，并返回一个可爱的填充数组。


• print_r（$ _ COOKIE）在Chrome中失败，并返回一个空数组。

这是问题的核心，我的功能无法识别Cookie的存在，因为Chrome无法识别。

• 我确保每个浏览器都接受cookie。


• 我已经检查过开发工具，以确保cookie在所有浏览器中都存在（确实如此）。


• 我意识到cookie的价值在下一页加载之前不可用，但这在这里不是问题。


• 在初始setcookie（）上方没有输出；

那么我如何让Chrome（和其他浏览器）识别它自己的cookie？有谁知道为什么这一切都可以在Firefox上正常运行，但在其他地方却失败？我创建了一个仅包含以下文件的文件：

 <？php 
 print_r（$ _ COOKIE）; 
？> 
  

再次，我在Firefox中看到了cookie数组。同时，在Chrome，IE，Opera，Safari中，我得到了一个空数组。

解决方案

OP返回答案：

好的，我将其添加为答案，以防其他任何人遇到这种（完全奇怪的）行为并落在这里：

<事实证明，我的托管服务提供商正在对我不知道的WordPress网站进行一些严重的缓存。

在我发布问题时，我认为使用WordPress并不重要，但显然与之相关。

基本上是这样做的：

---

使用干净的缓存：

• 访问者1访问该站点。


• PHP将按预期方式处理并产生输出。



• Visitor 1被提供给php输出（基于浏览器的参数等）。




• 访问者2访问该站点。访客2看到 *访客1的网站版本。

该php被处理一次

这种缓存行为意味着通过php访问cookie根本无法正常工作，但是使用Javascript可以正常工作。

p>

（重要说明：：事实证明，对于登录时查看站点的任何用户，上述缓存行为均被禁用wordpress ，这是WordPress Cache插件的常见行为，这就是为什么我在Firefox中看到的行为与在其他浏览器中看到的行为不同的原因，因为我是积极使用Firefox登录的。这可能是有用的信息

---

我的解决方案：

使用Javascript对.php文件运行AJAX查询，该文件将处理访问者的语言首选项并以2字符形式返回输出搜寻者代码（即'en''es''pt''de'等）。

使用AJAX调用php允许我使用php的服务器端访问权限浏览器的语言偏好，同时规避主机的超级农业缓存。

我希望这对某人有帮助！感谢所有试图帮助我解决这个问题的人。

Basic situation and basic relevant info: I have a php code that executes before the opening <doctype> tag. The hope was to (if necessary) send a redirect based on user's browser's language preferences before anything else loads.

The script attempts to do two things based on highest supported language preference:

1. Use php: setcookie() to create a cookie with the two-letter language code.
   • Example cookie name = value: x_language = es
2. Use php: header("Location: " . $requestedSite); to redirect to a subdomain,
   • Example domain: es.domain.com

Example:

if (isset($_COOKIE['x_language'])) {
    -Determine correct subdomain based on cookie value-
    -If not currently on that subdomain, redirect to it-
} else {
    setcookie('x_language','es',time() + 31536000 ,'/','.domain.com' );
    header("Location: " . $requestedSite);
}

The problem: Firefox works perfectly. Chrome (and other browsers) fail to recognize the cookies at all.

I've boiled it down to this:

• print_r($_COOKIE) works properly in Firefox, and returns a lovely, populated array.
• print_r($_COOKIE) fails in Chrome, and returns an empty array.

This is the core of the problem, my function doesn't recognize the existence of a cookie because Chrome doesn't.

• I've made sure every browser accepts cookies.
• I've checked dev tools to make sure the cookie is in place on all browsers, (it is).
• I realize a cookie's value isn't available until the next page load, but that isn't an issue here. Even after it is set, it won't read.
• There is no output above the initial setcookie();

So how do I get Chrome (and other browsers) to recognize its own cookies?! Does anyone know why this would all work flawlessly on Firefox but fail elsewhere?

---

On a lark I decided to try this. I created a file that only contains:

<?php
print_r($_COOKIE);
?>

Again, I see the cookie array in Firefox. Meanwhile, in Chrome, IE, Opera, Safari, I get an empty array. Could this be a server issue?

解决方案

OP returns with answer:

Alright, I'm adding this as an 'Answer' in case anyone else comes across this (totally bizarre) behavior and lands here:

It turns out my hosting provider was doing some seriously aggressive caching with my WordPress site that I was unaware of.

At the time I posted my question, I didn't think being on WordPress was relevant, but apparently it was.

Basically it was doing this:

---

With a clean Cache:

• Visitor 1 visits the site.
• The php processes and produces output as expected.

• Visitor 1 is served php output (based on his browser's parameters and such).

• Visitor 2 visits the site. Visitor 2 sees *Visitor 1's version of the site.

The php is processed once and only once per Cache-clear.

This caching behavior meant that accessing cookies through php was simply not going to work right, but accessing them with Javascript WOULD work.

(Important note: It turns out the above-stated caching behavior is disabled for any user viewing the site while logged into wordpress, and this is common behavior for WordPress Cache plugins. That is why I was seeing different behavior in Firefox than I saw in other browsers, because I was actively logged in with Firefox. This could be a helpful piece of information for someone out there.)

---

My solution:

Use Javascript to run an AJAX query to a .php file which would process the language preferences of the visitor and return the output as a 2-character code, (i.e. 'en' 'es' 'pt' 'de', etc).

Using AJAX to call php allowed me to use php's server-side access to a browser's language preferences while circumventing the super-agro caching of my host.

I hope this helps someone! And thanks to everyone who tried to help me out with this.

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