What Conditional do I need to specify *Secondary* User Groups?

[Ocean]

If I want a section of code in a PHP file to apply to Administrators (Group ID 6) only, I might use the following conditional:

PHP Code:

 
if ($bbuserinfo[usergroupid]==6)
{
 
} 


However, that conditional only works if the Primary User Group for a user is Group ID 6.

How does this conditional need to be modified so that it also works if a user's Secondary User Group is Group ID 6?


Thanks!