Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:67653
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain pcservice.co.za designates 69.93.82.2 as permitted sender)
MIME-Version: 1.0
Reply-To: pierre@pcservice.co.za
In-Reply-To: <CAL+t6cFnKAHyPsTBQBMpPtNEXm5kCa5a+bsVYMVoCHyE52MWMQ@mail.gmail.com>
References: <CAL+t6cFnKAHyPsTBQBMpPtNEXm5kCa5a+bsVYMVoCHyE52MWMQ@mail.gmail.com>
Date: Sat, 8 Jun 2013 09:13:51 +0200
Message-ID: <CAJbumGMSJp-oM3CpKhvOzO4g6=oQpvn9BOYA5hZpP+8cswxCyw@mail.gmail.com>
To: Sherif Ramadan <theanomaly.is@gmail.com>
Cc: PHP Internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=0023543329e6e34e2f04de9f4b6b
Subject: Re: [PHP-DEV] Proposal for new array_map function to pass in keys
From: pierre@pcservice.co.za (Pierre du Plessis)

--0023543329e6e34e2f04de9f4b6b
Content-Type: text/plain; charset=ISO-8859-1

> function my_call_back($key, $value) {
>     return array($value, strlen($value));
> }
> $array = str_word_count("PHP is lots of fun!");
> $array = array_map_key('my_call_back', $array);
>
>
> The result would be the following array:
>
> array(5) {
>   ["PHP"]=>
>   int(3)
>   ["is"]=>
>   int(2)
>   ["lots"]=>
>   int(4)
>   ["of"]=>
>   int(2)
>   ["fun"]=>
>   int(3)
> }
>
>
This example doesn't make any sense, as  str_word_count returns an integer,
so you would in fact pass an int to array_map_key and not an array.

But let's say using your example, you use explode(" ", $string) instead of
str_word_count, which will give you an array of all the words.

What happens in the following case:

function my_call_back($key, $value) {
    return array($value, strlen($value));
}
$array = str_word_count("PHP stands for PHP hypertext preprocessor");
$array = array_map_key('my_call_back', $array);


This would give you 2 keys with the value of PHP. What happens in this case?
What if you have duplicate integer keys. Does the keys simply increment or
throw an error?

--0023543329e6e34e2f04de9f4b6b--