Simple question. Here is this code.

    $r = rand(0,1);
    $c = ($r==0)? rand(65,90) : rand(97,122);
    $inputpass .= chr($c);

I understand what it does in the end result, but I'd like a better explanation on how it works, so I can use it myself. Sorry if this is a bad question.

If you're unsure of what I'm asking about, its the (function?) used here:

$c = ($r==0)? rand(65,90) : rand(97,122);