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Date: Tue, 21 Apr 2020 23:52:48 +0200
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Subject: Re: Any interest in a list type?
From: ajf@ajf.me (Andrea Faulds)
Message-ID: <php.internals-109765@news.php.net>

Hello again,

Andrea Faulds wrote:
> Hi,
> 
> Matthew Brown wrote:
>> I imagine such a "list" type would be a subtype of "array" – everywhere
>> that array was accepted, a list would be also, and it would have the same
>> copy-on-write behaviour.
> 
> IIRC with the modern implementation of arrays in the Zend Engine, you 
> can check that an array has no string keys, has keys in the right order, 
> and possibly even that they are all numbered 0 through (count($arr) - 1) 
> without gaps.

Sorry, what I meant to say was “you can check [quickly in O(1) time] 
that an array has no string keys [etc]”. This is because of the Zend 
Engine's “packed arrays”.

Thanks,
Andrea