Re: Calling array_merge / array_merge_recursive without arguments

On 21-05-19 10:29, Nikita Popov wrote: > This one makes sense in theory, because array_map(null, ...$arrays) is a > way to perform a zip operation in PHP. Unfortunately there is an ugly > special case if there is only a single array, which makes this not actually > usable in practice, unless you know that there are at least two arrays. As > such, accepting zero arrays wouldn't be very useful unless we also want to > fix that issue (PHP 8 maybe?) Ah, I overlooked that edge case. Indeed, array_map() would require more fixing than I anticipated. I guess it is out of scope for the type of fix we are discussing. >> array_diff() & friends > > array_intersect() & friends > > > These look like good candidates for allowing a single arg. For array_intersect(), I was actually considering to allow zero arguments. The use case I have in mind is to determine the common elements in a set of zero or more arrays, like this: array_intersect(...$arrays) If that would just return an empty array when $arrays is empty, no additional empty check is needed and the above would do what I intuitively expect it to do.