(Easy) How to write this IF conditional in php format

[basketmen]

Guys i want to write this code in plugin, what is the right code for that

<if condition="is_member_of($vbulletin->userinfo, 1, 2)"></if>

[Lynne]

if (is_member_of($vbulletin->userinfo, 1, 2)){
stuff
}