How to check whether your work on WP or WPMU ?

Question

right now, i use global variable $table_prefix to differ whether i work on WP or WPMU. I need this global for my plugin. But is there any better way to check whether your pluggin is working on wp or wpmu ?

any suggestion will be great

Answer 1

You could define a constant:

e.g.

define('ENVIRONMENT', 'WP');

define('ENVIRONMENT', 'WPMU');

Answer 2

In WPMU a global variable named wpmu_version should be set.