How to still have the debug turned on on production

app.php

<?php

return array(
	/*
	  |--------------------------------------------------------------------------
	  | Application Debug Mode
	  |--------------------------------------------------------------------------
	  |
	  | When your application is in debug mode, detailed error messages with
	  | stack traces will be shown on every error that occurs within your
	  | application. If disabled, a simple generic error page is shown.
	  |
	 */

	'debug' => call_user_func(function() {
		if (isset($_SERVER['REMOTE_ADDR']) && in_array($_SERVER['REMOTE_ADDR'], array('255.255.255.255' /* put your IP here */))) {
			return true;
		}
		
		return false;
	}),
);