php man page for getenv

GETENV(3)								 1								 GETENV(3)

getenv - Gets the value of an environment variable

SYNOPSIS
       string getenv (string  $varname)

DESCRIPTION
	Gets the value of an environment variable.

	You  can  see  a list of all the environmental variables by using phpinfo(3). Many of these variables are listed within RFC 3875, specifi-
       cally section 4.1, "Request Meta-Variables".

PARAMETERS
	      o $varname
		- The variable name.

RETURN VALUES
	Returns the value of the environment variable $varname, or FALSE if the environment variable $varname does not exist.

EXAMPLES
       Example #1

	      getenv(3) Example

	      <?php
	      // Example use of getenv()
	      $ip = getenv('REMOTE_ADDR');

	      // Or simply use a Superglobal ($_SERVER or $_ENV)
	      $ip = $_SERVER['REMOTE_ADDR'];
	      ?>

SEE ALSO
       putenv(3), apache_getenv(3), Superglobals.

PHP Documentation Group 														 GETENV(3)