Add if rule in the plugin
 

Hello ,
I just would like to know how i can put this if rule inside plugin ,

include a file for example


maybe you will tell me to use is rules , is the below right ?

if (is_member_of($vbulletin->userinfo, 1)) (The group of guests)
{
//return empty result
} else {
include
}

Thanks ,
Zi5