How to find the version of the Codeigniter framework we are currently using?

CodeIgniter - Interview Questions

Finding out the version can be done in two ways.

The first way is to run the below code:

<?php echo CI_VERSION;?>

The second way is to obtain the system/core/CodeIgniter.php directory and run the code given below :

define('CI_VERSION', '3.0.0');
or
define('CI_VERSION', '3.0.1');
.
.
.
define('CI_VERSION', '3.1.0');