Le Wed, 2 Sep 2020 19:13:20 +0200,
Nikita Popov <[email protected]> a écrit :
> Just like the first time this was discussed, I don't think this RFC makes a
> sufficient case on why we need explicit syntax for this. Just ignoring the
> value is an existing pattern that works across all PHP versions:
>
> foreach ($iterable as $key => $_) { ... }
I currently use foreach (array_keys($array) as $key) { ... }
to avoid complains from code analysers on unused var, is it slower?
One obvious pro of having a dedicated syntax is not having to ask those
questions to ourselves while coding.
> Iterating over just the keys is not a super common pattern and we already
> have a reasonable way to do it (that is imho just as clear, and actually
> more concise than the proposed "null" variant). The only potential
> advantage to a dedicated syntax that I see is that there could be iterators
> that can cheaply produce keys, but have expensive to produce values. That
> seems like an edge case of an edge case though, and is a situation where
> manually calling ->key() would be justifiable.
In our code base I thinks it is quite common.
grepping on "foreach (array_keys" gives me 51 cases, while grepping "foreach ("
gives me 1153, so that’s 4% of our foreach uses.
Côme
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