If your $_ENV array is mysteriously empty, but you still see the variables when calling getenv() or in your phpinfo(), check your http://us.php.net/manual/en/ini.core.php#ini.variables-order ini setting to ensure it includes "E" in the string.
(PHP 4 >= 4.1.0, PHP 5)
$_ENV -- $HTTP_ENV_VARS [deprecated] — Environment variables
An associative array of variables passed to the current script via the environment method.
These variables are imported into PHP's global namespace from the environment under which the PHP parser is running. Many are provided by the shell under which PHP is running and different systems are likely running different kinds of shells, a definitive list is impossible. Please see your shell's documentation for a list of defined environment variables.
Other environment variables include the CGI variables, placed there regardless of whether PHP is running as a server module or CGI processor.
$HTTP_ENV_VARS contains the same initial information, but is not a superglobal. (Note that $HTTP_ENV_VARS and $_ENV are different variables and that PHP handles them as such)
|4.1.0||Introduced $_ENV that deprecated $HTTP_ENV_VARS.|
Example #1 $_ENV example
echo 'My username is ' .$_ENV["USER"] . '!';
Assuming "bjori" executes this script
위 예제의 출력 예시:
My username is bjori!
이는 '자동전역' 변수입니다. 스크립트의 모든 영역에서 사용할 수 있습니다. 함수나 메쏘드 안에서 접근하기 위해서 global $variable;를 할 필요가 없습니다.
If you wish to define an environment variable in your Apache vhost file, use the directive SetEnv.
SetEnv varname "variable value"
It is important to note that this new variable will appear in $_SERVER, not $_ENV.
Comments for this page seem to indicate getenv() returns environment variables in all cases.
For getenv() to work, php.ini variables_order must contain 'E'.
When running a PHP program under the command line, the $_SERVER["SERVER_NAME"] variable does not contain the hostname. However, the following works for me under Unix/Linux and Windows:
$MachineName = $_ENV["HOSTNAME"];
else if (isset($_ENV["COMPUTERNAME"]))
$MachineName = $_ENV["COMPUTERNAME"];
else $MachineName = "";