(PHP 4, PHP 5, PHP 7)
Gets the value of an environment variable
string getenv ( string $varname )
Gets the value of an environment variable.
You can see a list of all the environmental variables by using phpinfo(). Many of these variables are listed within » RFC 3875, specifically section 4.1, "Request Meta-Variables".
Parameters:
varname
The variable name.
Returns:
Returns the value of the environment variable varname, or FALSE if the environment variable varname does not exist.
Examples:
getenv() Example
<?php
// Example use of getenv()
$ip = getenv('REMOTE_ADDR');
// Or simply use a Superglobal ($_SERVER or $_ENV)
$ip = $_SERVER['REMOTE_ADDR'];
?>
See also:
putenv() -
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