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

问题描述

我跑的Apache / 2.2.11（的Win32）PHP / 5.3.0 ，我做我的.htaccess文件如下：

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。为什么不是我的环境变量出现在那里？为什么它摆在首位是空的？

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?

我发现，虽然我的变量，但它出现在 $ _ SERVER 变量。而由于某种原因出现了两次，排序的。这是为什么？

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

看来我可以用 GETENV（'富'），所以也许我应该使用，而不是得到它。但我还是有点好奇，是什么原因导致这一点。这是一个Windows的问题？或者是怎么回事？

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

原来有在这里两个问题：

Turns out there was two issues here:

1。 $ _ ENV 如果php.ini中允许它只是填充，这似乎是默认不这样做，至少不是在默认的 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"

当我设置的 的variables_order 回 EGPCS ， $ _ ENV 不再是空的。

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

2。当您使用 SETENV 在的.htaccess ，它在 $结束_ SERVER ，而不是 $ _ ENV ，我得说是一点点混乱时，它的名称为 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。在 GETENV 函数工作，因为它显然搜索的两个的 $ _ ENV 和 $ _ SERVER 。此外，似乎这样做不敏感的情况下，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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