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Date: Tue, 18 Dec 2012 19:09:38 +0100
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To: victor@suumit.com
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Subject: Re: [PHP-DEV] How about implementing more data structures (ie Map,
 Set)
From: keisial@gmail.com (=?ISO-8859-1?Q?=C1ngel_Gonz=E1lez?=)

On 18/12/12 15:43, Victor Berchet wrote:
> Dear all:
>
> I would like to get your feedback on implementing some more data
> structure in the PHP core.
(...)

I think this could be summarised as "allow objects as keys for arrays".
Which would give the Map behavior.
Implementing Set from that is straightforward.