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getenv

Gets the value of an environment variable (PHP 4, PHP 5)
string getenv ( string varname )

Gets the value of an environment variable.

You can see a list of all the environmental variables by using phpinfo(). You can find out what many of them mean by taking a look at the » CGI specification, specifically the » page on environmental variables.

Parameters

varname

The variable name.

Return Values

Returns the value of the environment variable varname, or FALSE on an error.

Examples

Example 1840. getenv() Example

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

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