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To: Remi Collet <remi@fedoraproject.org>, internals@lists.php.net
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Date: Wed, 17 May 2017 00:03:46 +0200
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Subject: Re: [PHP-DEV] BC break in master (7.2) - Distinguish betweenunmatched
 subpatterns and empty matches in preg_*()
From: cmbecker69@gmx.de ("Christoph M. Becker")

On 15.05.2017 at 17:49, Remi Collet:

>> I suggest not to set unmatched subpatterns at all,
> 
> Can you give an example of expected output ?
> (I think stable position for matched pattern is important)
> 
> php -r 'var_dump(preg_match("/(a)?([a-z]*)(\d*)/", "123", $matches),
> $matches);'

See the pcretest results danielklein posted in his last comment on
<https://bugs.php.net/61780>.  Basically, instead of assigning NULL as
values, the array indexes could be skipped, so that array_key_exists()
can be used to determine whether a certain subpattern matched or not.

-- 
Christoph M. Becker