Question

When I try to use define('LANG', $this->uri->rsegment(2)); in constants.php, I got this error:

Using $this when not in object context in constants.php.

I have no clue why. I’m quite new with codeIgniter and I want to define a constant that will take the language from the URI. I have already done something similar using REQUEST_URI, but with uri->segment; that will be much easier.

Answer 1

The way codeigniter is architectured, you cannot use $this in config.php, because all the framework resources are not loaded by the time constant.php is loaded.

In order to do what you need to, you should do the following:

Create a new custom config file, say app_config.php (you can call it whatever you want)

Add this code to app_config file:

$ci = &get_instance();
define('LANG', $ci->uri->rsegment(2));

Place this file in config folder (same folder where config.php is)

In autoload.php, add this config file’s name to be autoloaded as:

/*
| -------------------------------------------------------------------
|  Auto-load Config files
| -------------------------------------------------------------------
| Prototype:
|
|   $autoload['config'] = array('config1', 'config2');
|
| NOTE: This item is intended for use ONLY if you have created custom
| config files.  Otherwise, leave it blank.
|
*/

$autoload['config'] = array('app_config');

Now you will be able to access the constant LANG across the application..