$_ENV
PHP function
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Environment variables
Description
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.
Examples
$_ENV example
php
<?php
echo 'My username is ' .$_ENV["USER"] . '!';
?>Assuming "bjori" executes this script
The above example will output something similar to:
output
My username is bjori!