(PHP 4, PHP 5, PHP 7)
getenv — Gets the value of an environment variable
$varname
[, bool $local_only = FALSE
] ) : stringGets 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".
varnameThe variable name.
local_onlySet to true to only return local environment variables (set by the operating system or putenv).
Returns the value of the environment variable
varname, or FALSE if the environment
variable varname does not exist.
If varname is omitted, all environment variables are
returned as associative array.
| Versiune | Descriere |
|---|---|
| 7.1.0 |
The varname can now be omitted to retrieve an
associative array of all environment variables.
|
| 5.5.38, 5.6.24, 7.0.9 |
The local_only parameter has been added.
|
If PHP is running in a SAPI such as Fast CGI, this function will
always return the value of an environment variable set by the SAPI,
even if putenv() has been used to set a local
environment variable of the same name. Use the local_only
parameter to return the value of locally-set environment variables.
Example #1 getenv() Example
<?php
// Example use of getenv()
$ip = getenv('REMOTE_ADDR');
// Or simply use a Superglobal ($_SERVER or $_ENV)
$ip = $_SERVER['REMOTE_ADDR'];
// Safely get the value of an environment variable, ignoring whether
// or not it was set by a SAPI or has been changed with putenv
$ip = getenv('REMOTE_ADDR', true) ?: getenv('REMOTE_ADDR')
?>