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Message-ID: <5faa7b820812261028s7dd29063p47348abbf902c234@mail.gmail.com>
Date: Fri, 26 Dec 2008 10:28:28 -0800
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To: "Lukas Kahwe Smith" <mls@pooteeweet.org>
Cc: internals@lists.php.net
In-Reply-To: <03D6160A-376F-44A8-B82F-F31873CFA0BB@pooteeweet.org>
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	 <03D6160A-376F-44A8-B82F-F31873CFA0BB@pooteeweet.org>
Subject: Re: [PHP-DEV] Proposal: array_flatten function
From: m@mihasya.com ("Mike Panchenko")

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Lukas,

Hmmm I'm just trying to solve the basic problem (hence my skepticism towards
preserving keys - it seems an edge case). I think once you get to more
specific requirements, iterators are probably the way to go, since all the
standard functions you could use to shorten this would re-iterate over the
array internally anyway.

Cheers.

Mike.

On Fri, Dec 26, 2008 at 7:56 AM, Lukas Kahwe Smith <mls@pooteeweet.org>wrote:

> In one of my recent projects I had the need for something like this. I
> essentially had a recursive data structure of organizations and frequently I
> had to get a list of all organization ID's that were above or underneath a
> given organization. So I had to write a deeply self join which would produce
> lets say around 3-4 columns that either contained an ID or were NULL.
>
> I ended up with an implementation like the following. Actually looking at
> it now it seems way too complex but it works, so it goes:
>    function flattenArray($array) {
>        if (empty($array)) {
>            return array();
>        }
>        $first = reset($array);
>        if (empty($first)) {
>            return array();
>        }
>        $keys = array_keys($first);
>        $result = array();
>        foreach ($array as $row) {
>            foreach ($keys as $key) {
>                if (!empty($row[$key])) {
>                    $result[] = $row[$key];
>                }
>            }
>        }
>        $result = array_unique($result);
>        return $result;
>    }
>
> So I guess what I am asking for is a flag to ignore NULL's. Kind of reminds
> me of that patch Igor proposed the other day. Then again, we have sooooo
> many array functions its not even funny. So maybe we really should look more
> towards Iterators to help us consolidate things. Not sure.
>
> regards,
> Lukas
>

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