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  » urlencode()
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(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
// Example use of getenv()
$ip = getenv('REMOTE_ADDR');

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

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 .

Related Function(s)

phpinfo()

putenv()

apache_getenv()