Re: [VOTE] array_key_first(), array_key_last(), array_value_first(), array_value_last()

Le vendredi 13 juillet 2018, 16:48:29 CEST Levi Morrison a écrit : > Below is a proof-of-concept for the array_offset function > [mentioned > by Nicolas Grekas][2] (which by the way, neither the RFC author nor > anyone else responded to this suggestion) that is simply a convenience > wrapper over array_slice: > > function array_offset(array $input, int $offset): ?array { > $slice = array_slice($input, $offset, 1, true); > return count($slice) ? $slice : null; > } > > $assoc = ['one' => 1, 'two' => 2, 'three' => 3]; > $packd = range(1, 4); > > var_dump(array_offset($assoc, -1)); > var_dump(array_offset($packd, -1)); > > var_dump(array_offset($assoc, 0)); > var_dump(array_offset($packd, 0)); > > Of course, the array_slice function can be used to build all of > the > functions described in the RFC, as well. How would you do that, since array_slice still gives you an associative array as a result? array_values(array_slice($array, -1, 1, true))[0] is way less readable than array_last_value($array), and the question «how efficient is that and how many array copies are made?» becomes complicated to answer for non-initiated. While with a native function you expect it to be as efficient as possible to do what you ask it. (And as you state in your other mail in the end this array_slice solution is not as efficient as you expected) I would have been fine with array_key($array, $offset=0) and array_value($array, $offset=0) instead of the 4 functions from the RFC to be able to use any offset. Côme