how to define global constants in codeigniter in constants.php

Question

I have stored my global constants in config->constants.php but it creating problem and throwing error I have defined it like this, how to call it in controller, code

define('SuperAdmin','1');
define('Admin','2');
define('CityAdmin' '3');
define('SupportAdmin','4');
define('RestaurantUser','5');
define('FrontUser','6');
define('Other','7');

Answer 1

You don't need to load constants anywhere, they're automatically autoloaded by CI itself, that is the point of them. To use them keep in mind they are constants and not a variable as you're used to with the $. So in your case after defining them, anywhere in your application you could for example use:

if($user->userType == SuperAdmin)
{
   do something here;
}

Note that the SuperAdmin is written without a $ preceding it and not inside quotes. Again, after defining them in the constants file you need to do nothing else to begin using them in your application.

Answer 2

First of all use the conventions that you must define the constants in capital letters. Like

define('SUPERADMIN','1');
define('ADMIN','2');
define('CITYADMIN' '3');

you can use the constants in controller like

if($user->userType == SUPERADMIN)
{
   //Your code ...
}

and if you want to use in html file/ view file in codeigniter you can use constants in html file like

<?php echo SUPERADMIN; ?>

You can access the constants in this way.

Answer 3

Always follow naming convention for constant in only capital letter. If you declared constant in application/config/constants.php file then it will available through out your application.