为什么我的$ _ENV为空？ [英] Why is my $_ENV empty?

问题描述

我正在运行 Apache / 2.2.11（Win32）PHP / 5.3.0 ，我在.htaccess文件中执行了以下操作：

I'm running Apache/2.2.11 (Win32) PHP/5.3.0 and I did the following in my .htaccess file:

SetEnv FOO bar

如果我打印出一个PHP文件中的 $ _ ENV 变量，我得到一个空数组。为什么我的环境变量不存在？为什么首先是空的？

If I print out the $_ENV variable in a PHP file, I get an empty array. Why doesn't my environment variable appear there? Why is it empty in the first place?

我确实找到了我的变量，但它出现在 $ _ SERVER 变量。由于某种原因，它出现了两次。为什么是这样？

I did find my variable though, but it appears in the $_SERVER variable. And for some reason it appears twice, sort of. Why is this?

[REDIRECT_FOO] => bar
[FOO] => bar

看来我可以使用 getenv（'FOO'） / code>，所以也许我应该使用它。但是，对于什么原因，我仍然有点好奇。这是Windows的问题吗？或者发生了什么？

It appears I can get it using getenv('FOO'), so maybe I should just use that instead. But I am still a bit curious to what causes this. Is this a Windows issue? Or what is going on?

推荐答案

结果有两个问题在这里：

Turns out there was two issues here:

1。只有在php.ini允许的情况下才会填充$ _ ENV ，默认情况下似乎不执行，至少不在默认情况下 WAMP服务器安装。

1. $_ENV is only populated if php.ini allows it, which it doesn't seem to do by default, at least not in the default WAMP server installation.

; This directive determines which super global arrays are registered when PHP
; starts up. If the register_globals directive is enabled, it also determines
; what order variables are populated into the global space. G,P,C,E & S are
; abbreviations for the following respective super globals: GET, POST, COOKIE,
; ENV and SERVER. There is a performance penalty paid for the registration of
; these arrays and because ENV is not as commonly used as the others, ENV is
; is not recommended on productions servers. You can still get access to
; the environment variables through getenv() should you need to.
; Default Value: "EGPCS"
; Development Value: "GPCS"
; Production Value: "GPCS";
; http://php.net/variables-order
variables_order = "GPCS"

当我设置了 variables_order 返回 EGPCS ， $ _ ENV 不再为空。

When I set the variables_order back to EGPCS, $_ENV is no longer empty.

<强> 2。当您在 .htaccess 中使用 SetEnv 时，最终将以 $ _ SERVER ，而不是 $ _ ENV ，我不得不说，当它命名为 SetEnv ...

2. When you use SetEnv in your .htaccess, it ends up in $_SERVER, not in $_ENV, which I gotta say is a tad confusing when it's named SetEnv...

# .htaccess
SetEnv ENV dev
SetEnv BASE /ssl/

# php
var_dump($_SERVER['ENV'], $_SERVER['BASE']);

// string 'dev' (length=3)
// string '/ssl/' (length=5)

3。 getenv 函数起作用，因为它显然搜索 $ _ ENV 和 $ _ SERVER 即可。另外，它似乎对case非常敏感，这可能是有用的。

3. The getenv function worked because it apparently searches both $_ENV and $_SERVER. Additionally it seems to do so insensitive to case, which might be useful.

var_dump(getenv('os'), getenv('env'));

// string 'Windows_NT' (length=10)
// string 'dev' (length=3)

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