php错误中的未定义索引(键)

First, here are the hierarchy of files:

首先，这里是文件的层次结构:

system/
...index.php
...core/
.......MasterView.php
.......Test.php
...sources/
.......ajax/
............ajaxtest.php
.......js/
............jstest.js
and so on.

index.php includes Test.php.

索引。php包含Test.php。

Test.php contains these lines:

测试。php包含这些线:

$GLOBALS['foo'] = 'foo'; // note 1
require(ROOT.'/core/MasterView.php'); // render master view.

MasterView.php contains simple html tags but calls on jstest.js in system/sources/js/ directory.

MasterView。php包含简单的html标记，但是调用jstest。js在系统/资源/ js /目录中。

jstest.js in system/sources/js/ directory made an ajax call to ajaxtest.php.

jst。在system/sources/js/ directory中的js对ajaxtest.php进行了ajax调用。

ajaxtest.php in system/sources/ajax/ directory contains this line:

ajaxtest。系统/源/ajax/目录中的php包含以下一行:

echo $GLOBALS['foo']; // note 2

After running index.php on browser, the following error occurs:

跑后指数。php浏览器出现以下错误:

Undefined index: foo in ...ajax\ajaxtest.php ...

particularly pointing to note 2 line. My question is, why does php does not recognize foo index when I have defined it on note 1 line before calling MasterView.php?

特别指向注意2线。我的问题是，当我在调用MasterView.php之前在注释1行定义了foo索引时，为什么php不识别foo索引?

PS: I know the above method is not the best way to do it but I only give it as an illustration to my problem.

我知道上面的方法并不是最好的方法，但我只给出一个例子来说明我的问题。

EDIT:

编辑:

I've tried using $_SESSION['foo'] instead of $GLOBALS['foo'] in both files just to mention one solution I've tried. Same error occurs. Php does not recognize the index foo.
我尝试在两个文件中使用$_SESSION['foo']而不是$GLOBALS['foo']，只是想提一下我尝试过的一种解决方案。同样的错误发生。Php不识别索引foo。

1 个解决方案

#1

jstest.js in system/sources/js/ directory made an ajax call to ajaxtest.php.

jst。在system/sources/js/ directory中的js对ajaxtest.php进行了ajax调用。

Global variables are global to the same request only. If you connect files with an AJAX request in between, the global variable is not available because AJAX will create a new request.

全局变量仅对同一个请求是全局的。如果您将文件与AJAX请求连接在一起，那么全局变量是不可用的，因为AJAX将创建一个新的请求。

You can share data across multiple requests by creating some sort of Server Session State by using cookies, a database or PHP sessions^Docs.

你可以共享数据跨多个请求通过创建某种服务器会话状态通过使用cookie,数据库或PHP会话文档。

#1