[How?] Usergroup permissions in a mod/hack?

[Stagehandspace]

I'm trying to create a mod with usergroup permissions, I have placed

PHP Code:

$vboptions[xx_xx_group] 


within a conditional

PHP Code:

<if condition="is_member_of($bbuserinfo,$vboptions[xx_xx_group])">
CONTENT
<else />
OTHER CONTENT
</if> 


as a replacement for:

PHP Code:

<if condition="is_member_of($bbuserinfo, 1,2,3) "> 


so to allow options in admincp but it only seems to work if only 1 group is selected otherwise the "else" content is shown.

I've searched high and low and have found different variations of this with and without arrays

PHP Code:

<if condition="in_array($bbuserinfo[usergroupid],array(6,15))"> 


PHP Code:

<if condition="is_member_of($bbuserinfo,array(6,15))"> 


and none seem to work.

Please help me!!