(No version information available, might be only in CVS)
$HTTP_ENV_VARS — 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)
If the register_globals directive is set, then these variables will also be made available in the global scope of the script; i.e., separate from the $_ENV and $HTTP_ENV_VARS arrays. For related information, see the security chapter titled Using Register Globals. These individual globals are not superglobals.
| Version | Description |
|---|---|
| 4.1.0 | Introduced $_ENV. Note that the deprecated $HTTP_ENV_VARS did exist previously. |
Example #1 $_ENV example
<?php
echo 'My username is ' .$_ENV["user"] . '!';
?>
Assuming "bjori" executes this script
The above example will output something similar to:
My username is bjori!
Note: This is a 'superglobal', or automatic global, variable. This simply means that it is available in all scopes throughout a script. There is no need to do global $variable; to access it within functions or methods.