Definition: Getenv () is used to get the value of an environmental variable. It is written as Getenv (varname) ; Below are some examples of environmental variables you can use. If you are interested, you can see a full list by running phpinfo ().
Also Known As: Get Environment Variable
Examples:
<?php
//Gets the IP address
$ip = getenv("REMOTE_ADDR") ;
Echo "Your IP is " . $ip;
?> <?php
//Gets the document root
$root = getenv("DOCUMENT_ROOT") ;
Echo $root;
?> <?php
//Gets the server admin's email
$ad = getenv("SERVER_ADMIN") ;
Echo $ad;
?> 