getenv

(PHP 4, PHP 5, PHP 7, PHP 8)

getenvGets the value of an environment variable

Description

getenv(string $varname, bool $local_only = false): string|false
getenv(): array

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.

local_only

Set to true to only return local environment variables (set by the operating system or putenv).

Return Values

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.

Changelog

Version Description
7.1.0 The varname can now be omitted to retrieve an associative array of all environment variables.
7.0.9 The local_only parameter has been added.

Examples

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')
?>

Notes

Warning

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.

See Also

Here you can write a comment


Please enter at least 10 characters.
Loading... Please wait.
* Pflichtangabe
There are no comments available yet.

PHP cURL Tutorial: Using cURL to Make HTTP Requests

cURL is a powerful PHP extension that allows you to communicate with different servers using various protocols, including HTTP, HTTPS, FTP, and more. ...

TheMax

Autor : TheMax
Category: PHP-Tutorials

Midjourney Tutorial - Instructions for beginners

There is an informative video about Midjourney, the tool for creating digital images using artificial intelligence, entitled "Midjourney tutorial in German - instructions for beginners" ...

Mike94

Autor : Mike94
Category: KI Tutorials

Basics of views in MySQL

Views in a MySQL database offer the option of creating a virtual table based on the result of an SQL query. This virtual table can be queried like a normal table without changing the underlying data. ...

admin

Autor : admin
Category: mySQL-Tutorials

Publish a tutorial

Share your knowledge with other developers worldwide

Share your knowledge with other developers worldwide

You are a professional in your field and want to share your knowledge, then sign up now and share it with our PHP community

learn more

Publish a tutorial