Re: Undefined variables and the array append operator

Hi Rowan, Not really a "compelling reason why we should keep this inconsistency", but I have occasionally relied on array autovivification *for sub-dimensions*, e.g.: ``` function f(iterable $xs) { $map = []; // initialization! foreach ($xs as $x) { // $map[foo($x)] ??= []; not needed $map[foo($x)][] = bar($x); // autovivification } // Then e.g.: foreach ($map as $foo => $bars) { foreach ($bars as $bar) { /* ... */ } } } ``` (adapted from my https://externals.io/message/114595#114611 message in the "Disable autovivification on false" thread). On the other hand, I agree that $undefined[] = $x looks like a bug... are both cases the exact same opcode? (if yes, I wouldn't really mind updating my code, especially for consistency with other "append" operators like .= or +=, and that could even be an opportunity to rewrite it in a more "functional" style...) Regards, -- Guilliam Xavier