原来这里有两个问题：
1.$_ENV
仅在php.ini允许的情况下进行填充，默认情况下似乎没有这样做，至少在默认的WAMP服务器安装中没有。
; 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-ordervariables_order = "GPCS"
当我将
variables_orderback 设置为时
EGPCS，
$_ENV不再是空的。
2.当您SetEnv
在中使用时.htaccess
，它以而$_SERVER
不是中结束$_ENV
，我得说这在命名时有点令人困惑
SetEnv…
# .htaccessSetEnv ENV devSetEnv base /ssl/# phpvar_dump($_SERVER['ENV'], $_SERVER['base']);// string 'dev' (length=3)// string '/ssl/' (length=5)
3.该getenv
函数将始终有效，并且不受$ _ENV的PHP设置的影响。此外，它似乎对大小写不敏感，这可能很有用。
var_dump(getenv('os'), getenv('env'));// string 'Windows_NT' (length=10)// string 'dev' (length=3)
