I would usually go with the following code in my plain PHP projects.
if(!defined('ENVIRONMENT')){
define('ENVIRONMENT', 'DEVELOPMENT');
}
$base_url = null;
if (defined('ENVIRONMENT'))
{
switch (ENVIRONMENT)
{
case 'DEVELOPMENT':
$base_url = 'http://localhost/product/';
ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL|E_STRICTE_ALL);
break;
case 'PRODUCTION':
$base_url = 'Production URL'; /* https://google.com */
error_reporting(E_ALL);
ini_set('display_errors', 0);
ini_set('display_startup_errors', 0);
ini_set('log_errors', 1); /*/ Mechanism to log errors */
break;
default:
exit('The application environment is not set correctly.');
}
}