strtr VS CI bug? result parse error

[eluser]mddd[/eluser]
I think the problem is that there is an unclear situation here. The expression can mean two things:

echo ($c=(condition)) ? opt1 : opt2
or
echo $c = ( (condition) ? opt1: opt2)

See the difference? php needs to know whether the choice ( the ? operator) applies only to the strtr>$d operation or to the entire expression, which is $c = strtr > $d.
That is why it DOES work in your second example. Here there is no ambiguity about what the ? operation means.