PHP IF construct when dealing with a part that is an exception

I'm having some trouble getting my code to work. And I kinda lost my overview. Who can give me some insight?

I'm looking for how to build an IF construct. If I would describe it in words:

MismatchBundle = true unless (adminPass = true & user = admin)

I wrote the following code, but this didn't seem to work:

if (($MismatchBundle == true)  &&  ($adminPass != true && $thisUser['rankid'] != 1)

Anyone who knows how to get the 'unless' part in the code?

---

Edit: What about this?

 if (($MismatchBundle == true)  &&  !($adminPass == true && $thisUser['rankid'] == 1)

Is this allowed with the ! before a () section?