This rule would favor the "a ? : b" notation - which has
been supported by GCC for at least five years.
My personal reasons against ?: : - It's non-standard and not well known even though GCC supports it. - It's hard to look up. - It's easily confused with $a ? $b : $c; - It's ugly (-:C
I'd even prefer the Perl 6 err operator over it which is '//' or 'err' (low precedence) but then // is already the C++-style comment which I wish we hadn't introduced to PHP to start with :-)
But unless convinced otherwise I think a pseudo-function like coalesce() is the way to go.
- Chris
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