getenv

Gets the value of an environment variable (PHP 3, PHP 4 )
string getenv ( string varname )

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

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<?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.

Note:

This function does not work in ISAPI mode.

See also putenv().

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