Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:64341
Mailing-List: contact internals-help@lists.php.net; run by ezmlm
Received-SPF: pass (pb1.pair.com: domain gmail.com designates 209.85.210.178 as permitted sender)
MIME-Version: 1.0
In-Reply-To: <50D06E8B.9020807@php.net>
References: <50D05CD0.8080206@php.net>
	<CAPwsocFVzaCZLzUc=EQMFT3Oq-jAdVhyZzds=smmvWHYZ3T6WQ@mail.gmail.com>
	<50D06E8B.9020807@php.net>
Date: Tue, 18 Dec 2012 13:44:40 +0000
Message-ID: <CAPwsocFhPbLQUGuBuEBz1Uuz=5fpyRbRWEDVNtQqKEJSkgQckg@mail.gmail.com>
To: Stefan Neufeind <neufeind@php.net>
Cc: php-dev <internals@lists.php.net>
Content-Type: multipart/alternative; boundary=bcaec50fe22714ede704d120b3b0
Subject: Re: [PHP-DEV] Extension for str_replace / preg_replace with arrays
From: leight@gmail.com (Leigh)

--bcaec50fe22714ede704d120b3b0
Content-Type: text/plain; charset=ISO-8859-1

On 18 December 2012 13:24, Stefan Neufeind <neufeind@php.net> wrote:

> Since we already have functionality for replacing with arrays in place,
> I wondered if giving it one string to replace and then an array to
> choose the replacement from (rotating) would be an option. Currently
> that's "unsupported" (either two strings or two arrays).
>

It's certainly possible to implement, but personally it feels like odd
behaviour. I don't know what other people think about it.


> I think you could use a callback-function but would need to add quite a
> few more lines to initialise your array first, do a "next()" on the
> array inside the callback-function and (how would you pass it that
> array?) and still would have to handle starting from beginning of the
> array again once you reach the end etc.
>

You pass the array using "use". You could do it something like this:

$replacements = array(
    'one', 'two', 'three'
);

$result = preg_replace_callback(
    '/word/',
    function($matches) use (&$replacements) {
        $current = current($replacements);
        next($replacements) || reset($replacements);
        return $current;
    },
    'word word word word word'
);

var_dump($result);

Output:

string(21) "one two three one two"

--bcaec50fe22714ede704d120b3b0--