PHP Manual
Prev |  | Next

# getenv

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.

Prev | Home | Next
extension_loaded | Up | get_cfg_var