 |  |
| |
Read the value from the $_ENV superglobal array:
$name = $_ENV['USER'];
Environment variables are named values associated with a process. For instance, in Unix, you can check the value of $_ENV['HOME'] to find the home directory of a user:
print $_ENV['HOME']; // user's home directory /home/adam
Early versions of PHP automatically created PHP variables for all environment variables by default. As of 4.1.0, php.ini-recommended disables this because of speed considerations; however php.ini-dist continues to enable environment variable loading for backward compatibility.
The $_ENV array is created only if the value of the variables_order configuration directive contains E. If $_ENV isn't available, use getenv( ) to retrieve an environment variable:
$path = getenv('PATH');The getenv( ) function isn't available if you're running PHP as an ISAPI module.
Recipe 8.22 on setting environment variables; documentation on getenv( ) at http://www.php.net/getenv; information on environment variables in PHP at http://www.php.net/reserved.variables.php#reserved.variables.environment.
|  | |
| 8.20. Logging Debugging Information |  | 8.22. Setting Environment Variables |
Copyright © 2003 O'Reilly & Associates. All rights reserved.