how to check version of codeigniter framework?

Question

I recently setup a old Codeigniter framework on my xampp.But i don't know the version of this framework. I use the code

<?php echo CI_VERSION; ?> 

but its give me error

Notice: Use of undefined constant CI_VERSION - assumed 'CI_VERSION' in /opt/lampp/htdocs/projectname/views/v_header.php on line 57
CI_VERSION

Please guide me, I am new in Codeigniter.

Answer 1

See in system/core/CodeIgniter.php and there is a constant like this..

define('CI_VERSION', '3.0.6');