Christian Wenz wrote on 11/02/2016 09:17:
> On Mon, Feb 8, 2016 at 09:32 AM, Matthew Setter wrote:
>
>> The approach I took was this:
>>
>> return array_keys($arr) !== range(0, count($arr) - 1);
>
> FWIW, this might not work for arrays with missing indices like [0 =>
> 'a', 2 => 'b']
>
> I personally would appreciate a function like you proposed.
This is why the exact specification - and name - of any proposed
function needs to be considered carefully.
In many cases, what you actually want to verify is "is this a pure list
/ vector?" in which case you might *want* that array to return false. A
naive version of which would be "$arr === array_values($arr)".
