How can I output $bbuserinfo as part of a $thing?

[kall]

Ok, so the title is darned confusing.

Basically, I have my $nzb_greeting plugin. It gets the day of the week and according to that, outputs a message.

All good. Except, if I try to define the message as 'Hello $bbuserinfo[username]' (or $vbulletin->userinfo[username]), it comes out as "Hello, [Array]" or something like that, so in the template, I have to put $nzb_greeting, $bbuserinfo[username]... which is sloppy, and leads to things like it not getting fully called on error pages, so I get a forlorn 'kall' with an empty line under it where the other greeting should be.

Can anyone help me out here?