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Date: Fri, 7 Feb 2014 14:54:52 +0800
Message-ID: <CAHMUw2FkBotLPaH67rBVVALiNyW21bSXXHXjgLY4qgefa2CHZw@mail.gmail.com>
To: Yasuo Ohgaki <yohgaki@ohgaki.net>
Cc: Chris Wright <daverandom@php.net>, 
	"Kingsquare.nl - Robin Speekenbrink" <robin@kingsquare.nl>, PHP Internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=001a1136b374800c1204f1cb7719
Subject: Re: [PHP-DEV] [discussion] add array_usearch()
From: tjerk.meesters@gmail.com (Tjerk Meesters)

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Content-Type: text/plain; charset=ISO-8859-1

Hi,

On Fri, Feb 7, 2014 at 2:36 PM, Yasuo Ohgaki <yohgaki@ohgaki.net> wrote:

> Hi all,
>
> On Fri, Feb 7, 2014 at 9:26 AM, Tjerk Meesters <tjerk.meesters@gmail.com>wrote:
>
>> I'm not wildly enthusiastic about another magic flags parameter, but it's
>> an acceptable compromise for me. The slight advantage there is that
>> `in_array()` would be bestowed upon the ability to take a callback
>> function
>> as well. Something like:
>>
>> if (in_array('is_numeric', $array, SEARCH_NEEDLE_IS_CALLBACK)) { ... }
>>
>
> What we need is 'closure only callback'.
> If we have it, then we don't have to worry about string callback functions.
>
> if (in_array(function($elem) {return is_numeric(strstr($elem));}, $array))
> { ... }
>
> Why don't we have 'closure' as signature? It can do more than calling
> a function.
>
> bool in_array(closure $callback, array $ary);
>
> Cons would be we cannot search closures in $ary.
> Is there any use of searching closure?
>

That was my first attempt actually; if the first argument is a closure, use
that as the search callback. A few problems with that:
1) You can't use other types of callback, e.g. string or array.
2) [bc] You can't search through an array of closures.
3) [minor] the $strict argument becomes ambiguous.

The second problem can be mitigated by checking if $strict is given and
`true`, but it becomes rather messy.


> Regards,
>
> --
> Yasuo Ohgaki
> yohgaki@ohgaki.net
>
>


-- 
--
Tjerk

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