$a if $b, otherwise $c;
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Be equivalent to

$b ? $a : $c;
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?

If so, I guess that's kinda cool, if a little confusing. We already have differently-binding text equivalents for the usual symbolic logical operators, why not the good ol' ternary conditional?

FWIW, I use unless instead of if ! all the time. In fact, I am routinely dissapointed by the fact that we don't have a built-in elsunless. :)