I have tried to place this at the bottom of the config/config.php but it is throwing this error: An uncaught Exception was encountered Type: Error Message: Class ‘CI_Controller’ not found Filename: E:xampp74htdocsjrvssystemcoreCodeIgniter.php Line Number: 369 Please suggest me some solution for this. If this is not possible then what else we can do to make constants dynamic? Answer constants.php is