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# getenv

(PHP 3, PHP 4 , PHP 5)

getenv -- Gets the value of an environment variable

## Description

string getenv ( string varname)

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

`<?php $ip = getenv("REMOTE_ADDR"); // get the ip number of the user ?>`

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.

> 備注: This function does not work in ISAPI mode.

See also putenv().

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