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Date: Thu, 11 Feb 2016 11:58:10 +0000
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Subject: Re: [PHP-DEV] Re: Proposal for a new array function
From: rowan.collins@gmail.com (Rowan Collins)

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)".