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# getenv

(PHP 3 <= 3.0.18, PHP 4 >= 4.0.0)

getenv -- Get the value of an environment variable

## Description

``string getenv` (string varname)`

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

    $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.

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

See also putenv().

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