CodeIgniter: Where to Declare Global Variables

We use global variables in CodeIgniter so we can access it anywhere, be it in controller, model, or view.

There are several ways to declare global variables in CodeIgniter.

Library

You can create your a file in application/libraries. Its class constructor contains an array as an argument. To use these variables you just have to autoload the newly created library.

constants.php

There is a file called constants.php where developers define constants. It is located at
application/config/constants.php. You can declare other types of variables in this file just fine.

//declare: 2 ways
$GLOBALS['expiration_date'] = '2019/05/07';
global $expiration_date;
$expiration_date = '2019/05/07';
//output
echo $GLOBALS['expiration_date'];
global $expiration_date;
echo $expiration_date;

Leave a Comment

Your email address will not be published. Required fields are marked *

We care about your privacy and data security. Google serves cookies to analyse traffic and show ads on this site. By using this site you agree to these cookies being set. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close