PHP code to get username of the logged-in user?

Is there a simple way to query the Community Builder app/system from PHP, to ask it for the username of the current logged-in user? I'm picturing something like this:

<?PHP
require("path/to/cb/cb_user_status.php");
$username = cb_get_username();
?>

Thanks for any help on this.

Yes, please review the below tutorials. If not being used in a CB plugin you'll need to first include CBs API. Once done you need to establish a $user object and from there you can call $user->username.

www.allmysocials.com/directory/tutorials/item/231-include-api-externally

www.allmysocials.com/directory/tutorials/item/232-establishing-user-object

Thanks for your reply. I tried the code on the first link you mentioned, but it didn't work. It gives this error:

Fatal error: Call to a member function getCfg() on a non-object in [php page] on line 13

Here is line 13:

if ( ! file_exists( $mainframe->getCfg( 'absolute_path' ) . '/administrator/components/com_comprofiler/plugin.foundation.php' ) ) {

My test page contains exactly the code shown on your first link, and nothing more (well, except for the opening and closing PHP tags).